CPT code 00214 describes anesthesia services rendered during intracranial procedures involving burr holes, including ventriculography. It sits within the intracranial anesthesia family (CPT codes 00210–00222) and carries 9 anesthesia base units as established by the American Society of Anesthesiologists (ASA) Relative Value Guide and confirmed by CMS. Accurate selection and documentation of this code directly determines reimbursement for the anesthesia team and can be the difference between a clean claim and a costly audit finding.
What Does CPT Code 00214 Mean?
CPT 00214 covers anesthesia for intracranial procedures performed via burr holes, a surgical technique where one or more small circular openings are drilled through the skull to access brain tissue or the ventricular system. Ventriculography — imaging of the cerebral ventricles through direct contrast injection or CSF sampling — is explicitly included in this code’s descriptor.
Key attributes of CPT 00214 at a glance:
- Code category: Anesthesia for procedures on the head (CPT range 00100–00222)
- Billable provider types: Anesthesiologists (physician), CRNAs (Certified Registered Nurse Anesthetists), Anesthesiologist Assistants (AAs)
- Applicable setting: Hospital inpatient, hospital outpatient, and ambulatory surgical center (ASC)
- Service category: General or neuraxial anesthesia; MAC (Monitored Anesthesia Care) is atypical but may apply in limited circumstances
- CMS-assigned base units: 9
- Reimbursement method: Anesthesia billing formula (base units + time units × locality conversion factor) — not standard RVU-based payment
What Procedures Does CPT 00214 Cover?
CPT 00214 applies whenever an anesthesia provider administers and monitors anesthesia for a surgical case in which burr holes are the primary intracranial access technique. This is distinct from open craniotomy, which is covered by higher-complexity codes.
Clinical presentations and surgical contexts that correctly map to CPT 00214 include:
- Burr hole placement for evacuation of chronic subdural hematoma (drainage via burr hole rather than full craniotomy)
- Burr hole access for stereotactic brain biopsy
- Ventriculostomy (external ventricular drain placement) for hydrocephalus or elevated intracranial pressure management
- Ventriculography — direct imaging of the ventricular system through contrast injection via burr hole
- Burr hole placement for intracranial pressure (ICP) monitor or Ommaya reservoir insertion
- Exploratory burr hole in trauma cases where imaging is not definitive
What Does CPT 00214 Specifically Exclude?
Billers frequently confuse the boundaries of CPT 00214 with adjacent intracranial anesthesia codes. This code does not apply to:
- Craniotomy or craniectomy procedures (open skull flap) — use CPT 00210 (NOS) or CPT 00211 (hematoma evacuation)
- Subdural tap procedures — use CPT 00212 (subdural taps carry only 5 base units vs. 9 for 00214)
- Cranioplasty or skull fracture elevation — use CPT 00215
- Intracranial vascular procedures (aneurysm clipping, AVM surgery) — use CPT 00216 (15 base units)
- Intracranial procedures performed in the sitting position — use CPT 00218 (13 base units), which adds complexity for positioning-related anesthesia management
- CSF shunting procedures (ventriculoperitoneal shunt, lumboperitoneal shunt) — use CPT 00220 (10 base units)
When Is CPT 00214 the Right Code to Use?
Selecting CPT 00214 correctly depends on confirming that anesthesia was rendered specifically for a burr hole-based intracranial technique. Follow this selection sequence:
- Confirm the surgical approach: The operative report must describe burr hole placement as the primary or sole cranial access method — not a standard scalp flap or formal craniotomy.
- Identify the intracranial target: Burr holes in CPT 00214 are used to access the ventricular system, brain parenchyma, or subdural space without a full skull flap. Stereotactic frames are frequently involved.
- Rule out vascular intent: If the neurosurgeon’s purpose is aneurysm repair, AVM treatment, or other vascular intervention, CPT 00216 applies regardless of whether burr holes are used as an access step.
- Confirm anesthesia was personally administered or medically directed: The anesthesia provider must have been present for induction, maintenance, and emergence — not simply consulting.
- Verify documentation supports anesthesia time: The anesthesia record must capture start and end times in minutes, along with patient monitoring parameters.
- Apply the ASA CROSSWALK®: Cross-reference the surgeon’s CPT code against the ASA Crosswalk to confirm the anesthesia code assignment. Surgical CPT codes such as 61140 (burr hole biopsy), 61210 (burr hole for ventriculography), or 61020 (ventricular puncture) map to CPT 00214.
How Does CPT 00214 Differ From CPT 00212 (Subdural Taps)?
This is the most common selection error within the intracranial anesthesia family. The distinction matters because base units — and therefore reimbursement — differ.
| Feature | CPT 00212 (Subdural Taps) | CPT 00214 (Burr Holes/Ventriculography) |
|---|---|---|
| Base units | 5 | 9 |
| Surgical access | Needle or small gauge instrument through existing opening or thin skull | Mechanical drilling of skull to create burr hole |
| Typical patient population | Neonates, pediatric (subdural taps through open fontanelle) | Adults and older children (skull is fused) |
| Ventricular access included? | No | Yes (ventriculography explicitly included) |
| Operative complexity | Lower | Moderate |
| ASA Relative Value | Lower complexity | Higher complexity — 9 base units |
In practice, anesthesia coders frequently encounter this distinction in pediatric neurosurgery cases, where a procedure initially described as a “subdural tap” may actually involve burr hole placement. Always obtain the operative report before assigning either code.
What Documentation Is Required to Support CPT 00214?
What Must the Anesthesia Provider Document in the Record?
The anesthesia record is the primary billing document for CPT 00214. Every element below must be present to withstand payer review:
- Start and stop times — Record the exact minute anesthesia began (induction in the OR or equivalent area) and the minute personal attendance ended (patient transferred to PACU supervision). Per CMS Medicare Claims Processing Manual, Chapter 12, Section 50, time is reported in total minutes on the claim form, not pre-converted units.
- Patient physical status classification — Document the ASA physical status (P1–P6) as this drives modifier selection and triggers additional scrutiny at higher levels.
- Anesthesia type — Specify general endotracheal anesthesia, total intravenous anesthesia (TIVA), or MAC, as applicable.
- Continuous monitoring parameters — ECG, pulse oximetry, end-tidal CO₂, blood pressure, and temperature documentation must appear in the anesthesia record at regular intervals.
- Provider identity and role — Clearly document whether the attending anesthesiologist personally performed the case (modifier AA) or medically directed a CRNA/AA (modifiers QK/QY + QX). Ambiguity here is a direct audit trigger.
- Intraoperative events and complications — Any unusual occurrence that extended anesthesia time must be documented with a clinical explanation.
- Pre-anesthesia evaluation — A pre-op assessment confirming the patient was evaluated and cleared for anesthesia must be present, typically completed the day of or day before surgery.
How Do Documentation Standards Differ for Facility vs. Non-Facility Settings?
| Documentation Element | Hospital Inpatient/Outpatient | Ambulatory Surgical Center (ASC) |
|---|---|---|
| Anesthesia record format | Institutional anesthesia flow sheet | ASC-specific anesthesia record |
| Pre-anesthesia evaluation | Required; time-stamped | Required; may be condensed |
| PACU handoff documentation | Formal nursing handoff note | Provider-to-nurse transfer note |
| Equipment/monitoring notation | Institutional standards apply | ASC must meet CMS Conditions of Participation |
| Claim submission | Part A (facility) + Part B (professional) | Part B (professional); ASC bills facility fee separately |
What Are the ASA Physical Status Modifier Documentation Requirements?
ASA physical status modifiers (P1–P6) are appended to the anesthesia CPT code and require supporting documentation in the pre-anesthesia evaluation. Payers use these modifiers to validate that the assigned physical status is consistent with the patient’s documented comorbidities.
- P1: Normal, healthy patient — no systemic disease
- P2: Mild systemic disease — controlled hypertension, mild obesity (BMI <40)
- P3: Severe systemic disease — poorly controlled DM, COPD, morbid obesity, active hepatitis
- P4: Severe systemic disease that is a constant threat to life — recent MI (<3 months), CVA, ongoing cardiac ischemia
- P5: Moribund patient not expected to survive without the procedure — ruptured aneurysm, massive trauma
- P6: Brain-dead patient for organ donation
Auditors commonly flag P3 and P4 claims where the pre-anesthesia evaluation does not explicitly document the qualifying condition with enough specificity to support the modifier.
How Does CPT 00214 Affect Medical Billing and Reimbursement?
Anesthesia codes are not reimbursed using the standard RVU × conversion factor formula used for surgical or E&M codes. Instead, reimbursement is calculated using the anesthesia payment formula:
Allowance = (Base Units + Time Units) × Anesthesia Locality Conversion Factor
Time units are derived by dividing total anesthesia minutes by 15. Medicare calculates to one-tenth of a unit — do not round.
CPT 00214 Base Unit and Reimbursement Reference Table
| Component | Value |
|---|---|
| CMS-assigned base units | 9 |
| Time unit calculation | Total anesthesia minutes ÷ 15 |
| Example: 90-minute procedure | 9 base units + 6.0 time units = 15.0 total units |
| Example: 105-minute procedure | 9 base units + 7.0 time units = 16.0 total units |
| Medicare locality conversion factor | Varies by MAC locality (approximately $21–$26 per unit nationally; confirm via CMS Anesthesiologists Center annually) |
| Illustrative Medicare payment (90 min, ~$22/unit) | 15.0 × $22.00 = ~$330 (illustrative only; verify current locality rate) |
| Medical direction 50% reduction | Applies when MD directs CRNA — each party receives 50% of total calculated allowance |
Note: Anesthesia base units for CPT 00214 are unchanged for CY 2026 per CMS. Always verify the current-year locality conversion factor via the CMS Physician Fee Schedule and your MAC’s published conversion factor table.
What Modifiers Are Commonly Used With CPT 00214?
| Modifier | Description | When to Apply | Billing Impact |
|---|---|---|---|
| AA | Anesthesia personally performed by anesthesiologist | Anesthesiologist present for entire case, no CRNA involvement | 100% of calculated allowance |
| QK | Medical direction of 2–4 concurrent CRNA cases | Anesthesiologist directing multiple simultaneous rooms | 50% of allowance (physician claim) |
| QY | Medical direction of one CRNA | Anesthesiologist directing a single CRNA | 50% of allowance (physician claim) |
| QX | CRNA under physician medical direction | CRNA performing case; physician billing QK or QY | 50% of allowance (CRNA/group claim) |
| QZ | CRNA without physician medical direction | Independent CRNA practice (permitted in opt-out states) | 100% of allowance |
| AD | Medical supervision by physician (>4 concurrent cases) | Physician supervising 5+ rooms; limited to 3 base units | Severely reduced; rarely optimal |
| P3–P4 | ASA physical status | Patient has severe or life-threatening systemic disease | Some commercial payers pay additional units |
| 23 | Unusual anesthesia | Procedure normally not requiring anesthesia requires general due to patient condition | Supports medical necessity for anesthesia administration |
| 53 | Discontinued procedure | Anesthesia or surgery terminated before completion | Bill only documented anesthesia time |
Are There Prior Authorization, LCD, or NCCI Restrictions?
- Medicare: CPT 00214 does not have a standalone National Coverage Determination (NCD), but medical necessity for the underlying surgical procedure (e.g., burr hole hematoma drainage) must be established. Review your MAC’s Local Coverage Determinations (LCDs) for the relevant neurosurgical procedure code.
- Prior authorization: Most commercial payers require prior authorization for the neurosurgical procedure, not the anesthesia code separately. Confirm payer-specific requirements — some high-cost payer contracts require the anesthesia group to verify authorization for both.
- NCCI/CCI bundling: Anesthesia codes in the 00100–01999 series are mutually exclusive with surgical codes for the same procedure — you cannot separately bill for both the surgery and the anesthesia for that surgery on the same claim by the same provider. This is a fundamental billing rule, not a modifier-bypassable edit.
- Separately billable services: Pain management blocks placed before induction or after emergence should not inflate the anesthesia time reported with CPT 00214. These may be billed separately only if they are distinct services — per the ASA Relative Value Guide and confirmed by the UnitedHealthcare Anesthesia Policy (2026).
- Opt-out states for CRNA supervision: Fourteen states have opted out of CMS CRNA physician supervision requirements. In these states, CRNAs may bill CPT 00214 with modifier QZ without a supervising physician. Billing teams must confirm the state’s opt-out status annually.
What CPT or HCPCS Codes Are Commonly Billed Alongside CPT 00214?
Anesthesia providers billing CPT 00214 typically work in tandem with the neurosurgical team. The table below reflects typical code pairings and bundling risk.
| Associated Code | Description | Typical Pairing Context | Bundling Risk |
|---|---|---|---|
| 61140 | Burr hole(s) for brain biopsy | Standard neurosurgical biopsy via burr hole | No — different provider bills surgical code |
| 61210 | Burr hole(s) for injection, aspiration, or drainage | Hematoma drainage, abscess drainage | No — surgeon bills; anesthesia bills 00214 |
| 61020 | Ventricular puncture through existing opening (with/without drainage) | Ventriculography/ventricular drainage | No — distinct provider |
| 61105 | Twist drill hole for subdural/epidural hematoma | Bedside or OR drainage | May need 00214 if full anesthesia administered |
| 99100 | Anesthesia for patient <1 year or >70 years | Patient age qualifies for qualifying circumstance | Yes — additive unit modifier, not a bundling edit |
| 99116 | Anesthesia for controlled hypotension | Deliberate hypotension required during case | Additive qualifying circumstance |
| 99135 | Anesthesia with controlled hypotension (separate) | Hypotensive technique documented | Additive qualifying circumstance — must be documented |
| 99140 | Anesthesia for emergency conditions | Emergency neurosurgery (ruptured hematoma) | Additive qualifying circumstance |
Which Code Combinations Trigger NCCI or CCI Edits?
- CPT 00214 billed by the same physician or group as the neurosurgical CPT code (e.g., 61140): This creates a bundling conflict — a provider cannot bill both the surgical procedure and anesthesia for that procedure. Different Tax ID or NPI is required.
- Multiple anesthesia codes on the same day for the same patient: Per ASA and commercial payer policy (including UnitedHealthcare), only the single anesthesia CPT code with the highest base unit value is reported when multiple procedures occur during a single anesthetic. Time is combined; only one code is billed.
- Qualifying circumstances (99100, 99116, 99135, 99140): These are additive — not separately payable as standalone claims. They are appended to the anesthesia code and some payers add additional base units. Confirm by payer contract.
What Coding Errors Should You Avoid With CPT 00214?
Anesthesia coding errors for intracranial codes tend to cluster around four themes: wrong code selection, time documentation failures, modifier mismatches, and missing qualifying circumstances.
- Selecting CPT 00212 instead of 00214: Subdural taps (CPT 00212, 5 base units) are often confused with burr hole procedures (CPT 00214, 9 base units) when the operative note is not reviewed carefully. Always confirm the surgical technique — needle aspiration vs. mechanical burr drilling.
- Defaulting to CPT 00210 (NOS) when a more specific code exists: CPT 00210 (not otherwise specified, 11 base units) should only be used when no specific intracranial anesthesia code applies. Using 00210 for a documented burr hole procedure is a specificity error that may trigger payer downcode.
- Reporting anesthesia start time as surgical incision time: Anesthesia time begins when the provider starts preparation in the OR, not when the surgeon makes the first incision. Early truncation of time reporting leads to systematic underbilling and may flag on internal audits.
- Missing or mismatched provider modifiers: A claim submitted without a required anesthesia provider modifier (AA, QK, QX, QZ, etc.) will be returned or denied. Medicare and most commercial payers treat the absence of a required modifier as a billing error.
- Failing to document a pre-anesthesia evaluation: Payers increasingly audit for pre-op documentation as a condition of payment. A missing pre-anesthesia evaluation note — even when the anesthesia was clearly provided — can result in claim denial.
- Inflating time by including the pain block placement period: If a nerve block is placed before induction or after emergence, that time does not count as anesthesia time for CPT 00214. Mixing these windows inflates units and creates overpayment risk.
What Do Auditors and RAC Reviewers Look for When Reviewing CPT 00214 Claims?
Auditors examining intracranial anesthesia claims under CPT 00214 typically focus on:
- Anesthesia record vs. operative report alignment: The documented procedure in the OR report must describe a burr hole access technique — not craniotomy, not simple needle tap
- Time unit mathematical accuracy: Medicare auditors verify that reported minutes ÷ 15 = claimed time units (to one decimal place)
- Medical direction modifier consistency: If one provider claims QK and a corresponding CRNA claim does not appear with QX (or vice versa), the RAC will flag for inconsistent claims data
- Qualifying circumstance documentation: Claims appending 99100 (age) or 99140 (emergency) must have supporting evidence in the pre-anesthesia evaluation and anesthesia record
- Physical status modifier support: P3 and P4 modifiers require clear documentation of the qualifying comorbidity in the pre-anesthesia assessment
- Duplicate date-of-service claims: Two anesthesia claims from different providers for the same patient, same date — both must use consistent medical direction modifiers or one will be denied
How Does CPT 00214 Relate to Other CPT Codes?
Understanding where CPT 00214 sits in the intracranial anesthesia hierarchy prevents both overcoding (selecting higher-complexity codes without supporting documentation) and undercoding (defaulting to lower base unit codes that underrepresent the work).
| Related Code | Relationship Type | Base Units | Key Distinction |
|---|---|---|---|
| CPT 00210 | Same family — NOS/catch-all | 11 | Unspecified intracranial; use only when no specific code applies |
| CPT 00211 | Same family — craniotomy/craniectomy hematoma | 10 | Surgical open skull flap for hematoma; higher complexity than burr hole alone |
| CPT 00212 | Same family — subdural taps | 5 | Needle aspiration without burr drilling; lower base units; typically pediatric |
| CPT 00215 | Same family — cranioplasty/depressed skull fracture | 9 | Same base units, but procedure is reconstruction or fracture elevation, not drainage |
| CPT 00216 | Same family — vascular procedures | 15 | Aneurysm, AVM, or cerebrovascular surgery — substantially higher complexity |
| CPT 00218 | Same family — sitting position | 13 | Any intracranial procedure performed with patient in sitting position adds physiologic complexity |
| CPT 00220 | Same family — CSF shunting | 10 | VP shunt, LP shunt, Ommaya reservoir revision — fluid diversion, not diagnostic access |
| CPT 00222 | Same family — intracranial nerve electrocoagulation | 6 | Targeted nerve ablation; lower complexity |
What Is the Correct Code Sequencing When CPT 00214 Appears With Other Codes?
- Single anesthesia session, multiple neurosurgical procedures: Bill the anesthesia code with the highest base unit value only. Combined total anesthesia time is reported. If both a burr hole procedure (00214, 9 units) and a CSF shunting procedure (00220, 10 units) are performed in one anesthetic, report CPT 00220 with the combined time — not both codes.
- Qualifying circumstances (99100, 99116, 99135, 99140): Report on the same claim line as CPT 00214, appended as additional modifiers or separate line items per payer requirement. Confirm the payer’s reporting preference.
- Pain management codes (e.g., 64415 nerve block): Bill separately on a distinct claim line only if performed as a distinct service outside the anesthesia time window. Do not bundle block time into CPT 00214 time.
- Postoperative pain management (01996): Daily management of epidural or subarachnoid drug administration is reported separately as CPT 01996 — not as a continuation of 00214.
Real-World Coding Scenario — How CPT 00214 Is Applied in Practice
A 67-year-old male with a history of COPD and anticoagulation therapy for atrial fibrillation presents with a two-week history of progressive left-sided weakness and confusion. CT imaging reveals a right-sided chronic subdural hematoma. The neurosurgeon schedules a burr hole craniotomy for subdural hematoma drainage — two burr holes are placed, and the hematoma is evacuated via irrigation and suction. Total anesthesia time from OR preparation to PACU transfer is 95 minutes. The attending anesthesiologist personally performs the case without CRNA involvement.
Correct Code Application
- Anesthesia code: CPT 00214 — burr holes (not open craniotomy, not subdural tap)
- Provider modifier: AA — anesthesia personally performed by anesthesiologist
- Physical status modifier: P3 — severe systemic disease (COPD + anticoagulated atrial fibrillation)
- Time reported: 95 minutes (Medicare will convert: 95 ÷ 15 = 6.3 time units)
- Total units: 9 base units + 6.3 time units = 15.3 units
- Qualifying circumstance: Consider 99140 if documented as emergency (confirm in pre-anesthesia note)
Common Mistake in This Scenario
- Incorrect code selection: CPT 00212 (subdural taps) is billed instead of 00214 because the coder reads “subdural hematoma” in the diagnosis and reflexively selects the “subdural” code — without reviewing the operative technique
- Why it fails: CPT 00212 describes needle aspiration (subdural tap), not burr hole drilling. The operative report documents mechanical drilling of two burr holes. This is a specificity error yielding 4 fewer base units (5 vs. 9) and significant revenue loss on every similar case
- Audit consequence: If discovered during a RAC review comparing anesthesia codes to neurosurgical operative notes, this pattern triggers overpayment demand on all similarly undercoded claims within the lookback period
Frequently Asked Questions About CPT Code 00214
Is CPT Code 00214 Still Valid for Billing in 2026?
CPT code 00214 remains a valid, active code for billing purposes in 2026 with no changes to its descriptor or ASA base unit assignment. Per the CMS Anesthesiologists Center, anesthesia base units for CPT codes 00100–01999 were confirmed unchanged for CY 2026. Verify the current-year locality-specific conversion factors via your MAC’s published anesthesia conversion factor schedule.
What Is the Difference Between CPT 00214 and CPT 00210?
CPT 00210 is an “NOS” (not otherwise specified) catch-all code covering intracranial anesthesia procedures that do not map to a more specific code, and it carries 11 base units. CPT 00214 is the specific code for burr hole-based access, including ventriculography, and carries 9 base units. When the operative report documents burr hole placement, CPT 00214 is the correct, specific selection — using 00210 for a documented burr hole procedure is a coding specificity error and may invite payer scrutiny.
How Many Base Units Does CPT 00214 Have, and How Is Reimbursement Calculated?
CPT 00214 carries 9 CMS-assigned base units. Total reimbursement is calculated by adding base units to time units (total anesthesia minutes ÷ 15) and multiplying by the anesthesia locality conversion factor for the billing period and geographic area. A 90-minute procedure yields 6.0 time units, for a total of 15.0 billable units. Always retrieve the current-year conversion factor from the CMS Physician Fee Schedule or your MAC’s fee schedule, as it varies by locality and changes annually.
Does CPT 00214 Require a Physical Status Modifier?
All anesthesia codes, including CPT 00214, require an ASA physical status modifier (P1 through P6) to be appended on the claim. Failure to include any anesthesia provider modifier — including both the physical status modifier and the staffing modifier (AA, QK, QX, QZ, etc.) — will result in the claim being returned for correction by Medicare and most commercial payers. The pre-anesthesia evaluation must document the clinical basis for the assigned physical status.
Can a CRNA Bill CPT 00214 Without Physician Supervision?
A CRNA may bill CPT 00214 independently — using modifier QZ — only in the 14 states that have opted out of the CMS CRNA physician supervision requirement. In all other states, CRNA services require physician medical direction, and both the supervising anesthesiologist (modifier QK or QY) and the CRNA (modifier QX) bill the same CPT 00214, each receiving 50% of the calculated allowance. Anesthesia billing teams should verify the opt-out status for their state annually through the CMS Anesthesiologists Center.
What Happens When Two Neurosurgical Procedures Are Performed Under One Anesthetic — Do You Bill Two Anesthesia Codes?
When multiple surgical procedures are performed during a single anesthesia administration, only the anesthesia code with the highest base unit value is reported. Time is combined for the entire anesthetic session. For example, if a burr hole hematoma drainage (00214, 9 units) and a CSF shunt revision (00220, 10 units) are performed consecutively in the same case, CPT 00220 is reported with combined total anesthesia time. Billing both 00214 and 00220 on the same claim for the same anesthetic is incorrect and will generate a duplicate claim edit.
What ICD-10 Diagnosis Codes Commonly Support Medical Necessity for CPT 00214?
Medical necessity for the anesthesia service is established by the underlying surgical indication. Common ICD-10 codes paired with CPT 00214 include S06.5X series (traumatic subdural hemorrhage), I62.00–I62.01 (nontraumatic subdural hemorrhage), G91.0–G91.9 (hydrocephalus requiring ventricular access), and C71 series (malignant brain neoplasm requiring stereotactic biopsy). The diagnosis code must reflect the condition documented in the pre-anesthesia evaluation and align with the neurosurgical procedure performed.
Key Takeaways for Billing and Coding CPT 00214
- CPT 00214 covers anesthesia for intracranial burr hole procedures, including ventriculography, and carries 9 CMS base units — not the same as the simpler subdural tap code (00212, 5 units) or the more complex vascular code (00216, 15 units)
- Reimbursement is calculated using (base units + time units) × locality conversion factor — verify your MAC’s current-year anesthesia conversion factor before benchmarking expected payments
- Every CPT 00214 claim requires both a staffing modifier (AA, QK, QY, QX, or QZ) and a physical status modifier (P1–P6); missing either triggers claim rejection
- In a medically directed scenario, both the supervising anesthesiologist and the CRNA each receive 50% of the total calculated allowance; confirm this split is reflected correctly in your group’s claims
- When multiple procedures occur under a single anesthetic, report only the highest base unit anesthesia code with combined total time — not multiple codes
- The operative report is the definitive document for code selection; never assign 00214 without confirming burr hole access technique is explicitly described
- Physical status modifiers P3 and P4 are audit targets — the pre-anesthesia evaluation must contain specific, documented comorbidities that support the assigned physical status level
- Consult CMS Medicare Claims Processing Manual, Chapter 12, Section 50 and the ASA Relative Value Guide annually for updates to anesthesia coding and payment policies
For a deeper understanding of anesthesia modifier billing rules and revenue cycle compliance for neurosurgical procedures, review the ASA’s Timely Topics in Payment and Practice Management series and your MAC’s anesthesia-specific billing guidelines.
