CPT code 00190 describes anesthesia services provided during surgical procedures involving the facial bones or skull that are not otherwise specified. It sits within the AMA CPT anesthesia code range 00100–01999 and is one of the most frequently reported codes in oral-maxillofacial surgery (OMFS), craniofacial reconstruction, and trauma surgery settings. Accurate billing requires understanding the code’s base unit value, how to calculate total anesthesia units, which modifiers are required, and when to escalate to the adjacent code 00192 for radical procedures.
What Does CPT Code 00190 Mean?
CPT 00190 covers anesthesia services administered by a qualified anesthesia provider — typically an anesthesiologist (MD/DO) or a certified registered nurse anesthetist (CRNA) — when the operative site involves the facial bones or skull in a non-radical surgical context. The phrase “not otherwise specified” (NOS) is significant: it signals that this code functions as the default selection for facial bone/skull anesthesia when no more specific code in the 00190–00222 range applies.
Key attributes of this code at a glance:
- Service category: Anesthesia (Section 00100–01999)
- Anatomical site: Facial bones and skull
- Provider type: Anesthesiologist, CRNA, or Certified Anesthesiologist Assistant (CAA)
- Billable setting: Hospital inpatient, hospital outpatient/ASC
- Base units (ASA/CMS): 5 base units
- Billing methodology: Base units + time units × locality-specific conversion factor
What Procedures Does CPT 00190 Cover?
CPT 00190 is appropriate for a broad range of operative procedures on the osseous structures of the face and skull. The anesthesia code follows the surgical procedure, not the other way around — coders use the ASA Crosswalk® or equivalent mapping tool to confirm the correct anesthesia CPT for the surgical CPT reported.
Clinical scenarios appropriate for CPT 00190 include:
- Open reduction and internal fixation (ORIF) of facial fractures (e.g., zygomatic arch fractures, orbital floor fractures, nasal bone fractures)
- Repair of mandibular or maxillary fractures not involving prognathism correction
- Excision of benign or malignant neoplasms of facial bones (non-radical)
- Craniofacial osteotomies not qualifying as radical surgery
- Reconstructive bone grafting procedures involving facial skeleton
- Repair of skull defects or fractures requiring operative intervention (non-intracranial, extradural)
- Debridement or drainage of osteomyelitis affecting facial bones
What Does CPT 00190 Specifically Exclude?
Several scenarios fall outside the scope of 00190 and require a different code:
- Radical facial bone/skull surgery including prognathism correction → use CPT 00192 (7 base units)
- Intraoral procedures (e.g., tooth extractions, alveolar surgery) → use CPT 00170 or 00172
- Intracranial procedures (involving brain structures) → use CPT 00210 and related codes
- Procedures on soft tissue of the face only (no osseous work) → use CPT 00300
- Anesthesia for rhinoplasty or sinus surgery without facial bone involvement → use CPT 00160 or 00162
When Is CPT 00190 the Right Code to Use?
Selecting the correct anesthesia code requires a disciplined, sequential approach. In practice, coders reviewing operative notes for oral-maxillofacial or craniofacial cases frequently default to 00192 when 00190 is actually correct — resulting in over-coding that triggers payer scrutiny.
Follow this selection process:
- Identify the primary surgical procedure from the operative report and assign the surgical CPT code(s).
- Locate the corresponding anesthesia code using the ASA Crosswalk® or your payer’s approved crosswalk methodology.
- Confirm the anatomical site involves the facial bones or skull — not purely intraoral, purely soft tissue, or intracranial.
- Assess whether the procedure qualifies as “radical” — specifically, does it involve extensive resection, prognathism correction (orthognathic surgery), or bilateral complex osteotomies? If yes, escalate to 00192.
- Confirm no more specific anesthesia code applies — if the procedure maps precisely to a more specific code in the 00100–00222 range, use that code instead of the NOS default.
- Default to 00190 when the procedure involves the facial bones or skull and no more specific or radical descriptor applies.
How Does CPT 00190 Differ From CPT 00192?
This is the most consequential distinction in the 00190 family. The two codes differ in clinical complexity and base unit assignment.
| Factor | CPT 00190 | CPT 00192 |
|---|---|---|
| Descriptor | Facial bones/skull; NOS | Radical surgery, including prognathism |
| ASA Base Units | 5 | 7 |
| Typical procedures | Facial fracture repair, bone excision, limited craniofacial work | Bilateral orthognathic surgery (BSSO, Le Fort), extensive tumor resections |
| Airway complexity | Moderate | High (nasal/nasopharyngeal RAE tube often required) |
| Typical case duration | 1–3 hours | 3–6+ hours |
| OIG audit sensitivity | Moderate | Higher (due to elective orthognathic procedures) |
Billing teams in multi-specialty practices that include OMFS often ask whether bilateral sagittal split osteotomy (BSSO) combined with genioplasty crosses the threshold for 00192. The answer is generally yes — bilateral orthognathic procedures are the prototypical 00192 scenario referenced in the AAPC community and supported by the code’s parenthetical descriptor “including prognathism.”
What Documentation Is Required to Support CPT 00190?
Anesthesia claims are unusual in that the anesthesia provider generates their own independent record — the anesthesia record — which must support both the code selection and the billed time units. Auditors reviewing CPT 00190 claims focus on the anesthesia record, not just the surgeon’s operative note.
What Must the Anesthesia Provider Document?
The anesthesia record and pre-anesthesia evaluation must include:
- Pre-anesthesia assessment — documented prior to induction, including patient history, physical examination, and ASA Physical Status classification (P1–P6)
- Anesthesia start time — defined as when the anesthesiologist begins preparing the patient for anesthesia induction (not surgical incision time)
- Anesthesia stop time — defined as when the anesthesiologist transfers care of the patient to a post-anesthesia recovery provider
- Type of anesthesia administered — general, regional, MAC, or combined, with technique specified (e.g., endotracheal intubation, LMA, nasal RAE tube)
- Anesthetic agents and doses — including induction agents, volatile agents or TIVA regimen, neuromuscular blockade
- Intraoperative monitoring — continuous ECG, pulse oximetry, capnography, temperature, and invasive monitoring if applicable
- Total anesthesia time in minutes — the raw value from which time units are calculated
- Provider identity and supervision level — which modifier reflects (AA, QK, QX, QY, QZ, or CRNA independence modifiers)
- Post-anesthesia note — documenting patient condition at time of transfer to PACU or recovery area
What Are the Documentation Standards for Facility vs. Non-Facility Settings?
| Documentation Element | Hospital/ASC | Office-Based Setting |
|---|---|---|
| Pre-anesthesia evaluation | Required; may be performed day prior | Required; must be same day for most payers |
| Anesthesia record | Standardized hospital form | Provider-generated; must meet AANA/ASA standards |
| Post-anesthesia note | Required in medical record | Required; often overlooked in office settings |
| Provider credentialing | Verified by facility | Provider must demonstrate independent qualification |
| MAC medical necessity | Generally accepted if documented | Requires explicit clinical justification; audit risk is higher |
How Does CPT 00190 Affect Anesthesia Billing and Reimbursement?
Anesthesia billing does not follow the standard RVU-based fee schedule used for surgical and evaluation and management codes. Instead, reimbursement is calculated using the anesthesia formula: (Base Units + Time Units) × Locality-Specific Conversion Factor.
For CPT 00190:
| Component | Value |
|---|---|
| ASA/CMS Base Units | 5 |
| Time Units | 1 unit per 15 minutes of anesthesia time (Medicare standard) |
| Physical Status Units | Added for P3 (+1), P4 (+2), P5 (+3) — payer dependent |
| Qualifying Circumstance Units | Added for codes 99100–99140, when applicable |
| Medicare Conversion Factor | Locality-specific (ranges approximately $20–$26 per unit nationally; verify via CMS Anesthesiologists Center) |
| Commercial Payer Conversion Factor | Contractual; typically $50–$80 per unit per published benchmarks |
Illustrative example: A 90-minute facial fracture repair under general anesthesia for a P2 patient: 5 base units + 6 time units (90 min ÷ 15) = 11 total units × locality conversion factor. Under Medicare, at a $22 conversion factor, allowable ≈ $242.
According to CMS, anesthesia base units for CPT 00190 have remained unchanged through CY 2025 and CY 2026.
What Modifiers Are Commonly Used With CPT 00190?
Modifier selection for anesthesia claims is mandatory — claims submitted without a valid anesthesia modifier will be returned for correction by most payers.
| Modifier | Description | When to Apply |
|---|---|---|
| AA | Anesthesia personally performed by anesthesiologist | Anesthesiologist is sole provider; no CRNA involved |
| QK | Medical direction of 2–4 CRNAs | Anesthesiologist directing multiple concurrent CRNA cases |
| QX | CRNA under medical direction | Paired with QK; submitted on CRNA’s claim line |
| QZ | CRNA without medical direction | Independent CRNA billing; no supervising anesthesiologist |
| QY | Medical direction of one CRNA | Anesthesiologist directing single CRNA case |
| P1–P5 | Physical status modifiers | Required by many payers; add units for P3–P5 |
| 23 | Unusual anesthesia | Procedure normally performed under local/no anesthesia; medically documented need for general |
| 47 | Anesthesia by surgeon | Surgeon personally administered anesthesia; rarely appropriate for facial bone procedures |
| 59 | Distinct procedural service | When anesthesia is provided for a separately identifiable service in the same operative session |
Are There Prior Authorization, Coverage Restrictions, or LCD Requirements?
- Medicare generally covers CPT 00190 when anesthesia is medically necessary for the underlying surgical procedure and the procedure itself is covered.
- No national coverage determination (NCD) specifically addresses this code; coverage is governed by medical necessity documentation and the coverage status of the associated surgical procedure.
- MAC (Monitored Anesthesia Care) billed under 00190 is subject to heightened audit scrutiny — documentation must establish clinical justification beyond patient preference.
- Some MACs and commercial payers require prior authorization for elective craniofacial procedures, which flows through to the associated anesthesia claim.
- There is no global period associated with anesthesia codes; 00190 is not subject to the 0-day, 10-day, or 90-day global period rules applicable to surgical CPT codes.
- NCCI bundling edits do not directly restrict 00190, but separately reportable services (e.g., arterial line placement CPT 36620, TEE CPT 93312) are not bundled into the base unit value and may be reported separately per ASA Relative Value Guide guidance.
What CPT or HCPCS Codes Are Commonly Billed Alongside CPT 00190?
The surgical team’s codes are billed separately from the anesthesia provider’s codes. However, anesthesia billers should be aware of what is frequently appearing on the same claim date and patient record.
| Associated Code | Description | Typical Context | Bundling Risk |
|---|---|---|---|
| 21346, 21360, 21365 | ORIF of zygomatic arch fracture (various complexity) | Most common surgical driver for 00190 | No — separate provider |
| 21431–21436 | Craniofacial separation (Le Fort procedures) | May escalate to 00192 instead | Evaluate 00190 vs. 00192 |
| 21085, 21086 | Facial prosthetic implants | Reconstructive cases; 00190 appropriate | No |
| 36620 | Arterial catheter placement | Anesthesia provider separately billable | No — per ASA RVG |
| 93312 | TEE, interpretation | If performed by anesthesia provider | No — separately billable |
| 99100 | Qualifying circumstance: extreme age | Pediatric or elderly patients | Report as add-on |
| 99140 | Qualifying circumstance: emergency | Emergency trauma cases | Report as add-on |
Which Code Combinations Trigger NCCI or CCI Edits?
- Anesthesia codes (00100–01999) are not subject to the same NCCI Procedure-to-Procedure (PTP) edits that apply to surgical codes, but they can be affected by Medically Unlikely Edits (MUEs), which set maximum units per day.
- The MUE for CPT 00190 is 1 unit per day — a single anesthesia encounter is expected; billing multiple units on the same date without documentation of separate anesthesia services will be flagged.
- Billing 00190 and 00192 for the same patient on the same date by the same provider will be denied; select only one code reflecting the highest level of service provided.
- Separately billing E/M services (e.g., 99213) on the same date by the anesthesia provider is generally not reimbursed unless the visit is a clearly distinct, separately documented service unrelated to the perioperative period.
What Coding Errors Should You Avoid With CPT 00190?
Anesthesia coders and billing teams encounter a predictable set of errors with this code. Ranked by audit frequency and revenue impact:
- Missing anesthesia modifier — Submitting 00190 without AA, QK, QX, QY, or QZ results in automatic claim rejection; this is the single most common denial trigger for anesthesia claims.
- Incorrect time documentation — Recording procedure time (incision to close) rather than anesthesia time (prep to patient hand-off) systematically under-reports billable units.
- Up-coding to 00192 without radical surgery documentation — Reporting 00192 for a simple facial fracture repair is an over-coding error; the operative note must explicitly document the radical nature of the surgery or orthognathic components.
- Down-coding to 00190 for bilateral orthognathic procedures — Conversely, billing 00190 for a BSSO + Le Fort I + genioplasty combination under-reports the service complexity.
- Omitting physical status modifier — Many commercial payers require P1–P5 modifiers and will reduce payment or deny without them; P3 and above also carry additional units with most payers.
- Bundling separately billable anesthesia services — Failing to separately report arterial catheter placement (36620) or TEE (93312) when performed by the anesthesia provider forfeits legitimate revenue.
- Applying modifier 47 inappropriately — Modifier 47 (anesthesia by surgeon) is rarely correct for facial bone procedures and should only be used when the operating surgeon personally administered regional or general anesthesia with no anesthesia provider present.
What Do Auditors and RAC Reviewers Look for When Reviewing CPT 00190 Claims?
When revenue cycle compliance teams conduct internal audits — or when RAC reviewers examine anesthesia claims — the following patterns draw heightened scrutiny:
- High time unit claims without corresponding operative documentation supporting prolonged case duration
- MAC billing (modifier QS) for procedures where general anesthesia would be expected, without documented clinical justification
- Physical status P3+ modifiers without pre-anesthesia evaluation documenting the systemic disease basis
- Concurrent case billing (QK/QX/QY modifiers) where anesthesiologist supervision ratios exceed Medicare’s 4:1 medical direction limit
- Emergency qualifying circumstance code 99140 applied to elective, scheduled craniofacial procedures
How Does CPT 00190 Relate to Other Anesthesia Codes?
CPT 00190 occupies a specific position within the head anesthesia family. Understanding the neighboring codes is critical for appropriate code selection and audit defensibility.
| CPT Code | Description | Relationship to 00190 | Key Distinction |
|---|---|---|---|
| 00170 | Anesthesia for intraoral procedures, NOS | Adjacent; commonly confused | Intraoral site vs. facial bone site |
| 00176 | Anesthesia for radical intraoral surgery | Adjacent | Radical intraoral scope; not facial bones |
| 00190 | Anesthesia, facial bones/skull, NOS | This code | Default NOS for facial bone/skull |
| 00192 | Anesthesia, radical surgery including prognathism | Direct relative; higher intensity | Requires documented radical scope |
| 00210 | Anesthesia for intracranial procedures, NOS | Escalation code | Intracranial (brain/dura involved) vs. extradural skull |
| 00215 | Cranioplasty or elevation of depressed skull fracture, extradural | May overlap | Use 00215 specifically for isolated skull fracture elevation |
| 00300 | Anesthesia, integumentary/muscle/nerve, head and neck | Alternative for soft tissue only | No osseous involvement |
What Is the Correct Code Sequencing When CPT 00190 Appears With Other Codes?
- Report the anesthesia CPT code (00190) as the primary anesthesia service on the claim.
- Report physical status modifiers (P1–P5) as a modifier on the 00190 line.
- Report provider role modifiers (AA, QK, QX, QY, or QZ) on the appropriate provider’s claim line.
- Report qualifying circumstance codes (99100, 99140) as separate line items when applicable.
- Report separately billable services (arterial line, TEE) as distinct line items with their own CPT codes.
- Do not report a second anesthesia CPT code for the same operative session — the single code that best describes the primary anesthetic encounter applies.
Real-World Coding Scenario — How CPT 00190 Is Applied in Practice
Clinical scenario: A 34-year-old patient presents to an oral-maxillofacial surgeon following a motor vehicle accident with a displaced right zygomatic arch fracture and orbital floor fracture. The operative plan is ORIF of the zygomatic arch and repair of the orbital floor blowout via a transconjunctival approach. The anesthesiologist induces general anesthesia via nasal RAE endotracheal intubation at 7:42 AM and transfers the patient to PACU at 10:18 AM. The patient is classified ASA P2 (mild systemic disease — controlled hypertension). The anesthesiologist personally performed all anesthesia without CRNA involvement.
Anesthesia time: 7:42 AM to 10:18 AM = 156 minutes = 10.4 time units (round to 10 units per CMS policy of not rounding up partial units under 7.5 minutes — verify payer policy)
Correct Code Application
- CPT 00190-AA-P2 — Anesthesia, facial bones, NOS; personally performed by anesthesiologist; ASA P2
- Total units: 5 base + 10 time = 15 units × locality conversion factor
- Rationale: Both the zygomatic arch and orbital floor are facial bones; the procedure is not radical; no prognathism or orthognathic component exists. 00190 NOS is the appropriate selection.
Common Mistake in This Scenario
- Incorrect code: CPT 00192 — The coder notes “orbital floor fracture repair” and assumes complexity triggers the radical surgery code.
- Why it fails: 00192 requires radical surgery including prognathism correction or equivalent extensive resection. Orbital floor repair, while technically delicate, does not meet this threshold. Auditors will request the operative report and deny 00192 in the absence of radical procedure documentation — with potential overpayment recovery going back multiple years.
Frequently Asked Questions About CPT Code 00190
Is CPT Code 00190 Still Valid for Use in 2025 and 2026?
CPT code 00190 remains a valid, active code for CY 2025 and CY 2026 with no changes to its AMA descriptor. According to CMS, anesthesia base units were unchanged for both CY 2025 and CY 2026; providers should verify current locality-specific conversion factors annually via the CMS Anesthesiologists Center.
What Is the Base Unit Value for CPT 00190?
CPT 00190 carries 5 anesthesia base units under CMS national values. This reflects a moderate complexity anesthetic — higher than soft tissue head/neck procedures (00300, 5 units) but lower than its radical counterpart 00192 (7 units) and substantially lower than intracranial procedures (00210, 11 units).
How Do I Calculate the Total Reimbursement for CPT 00190?
Reimbursement is calculated as: (Base Units + Time Units + Physical Status/Qualifying Circumstance Units) × Payer Conversion Factor. Time units are typically 1 unit per 15 minutes of documented anesthesia time under Medicare. Commercial payer conversion factors vary by contract and may range from approximately $50 to $80 per unit per published benchmarks; verify your specific contracted rates.
When Should I Use CPT 00192 Instead of CPT 00190?
Use CPT 00192 when the operative report documents radical surgery involving the facial bones or skull — most commonly bilateral orthognathic procedures such as bilateral sagittal split osteotomy (BSSO), Le Fort I or III osteotomies, or extensive tumor resections requiring wide excision of facial skeletal structures. If the documentation does not use language indicating radical extent or prognathism correction, 00190 is the appropriate default.
What Happens If an Anesthesia Modifier Is Missing From a CPT 00190 Claim?
Claims for anesthesia services submitted without a valid provider role modifier (AA, QK, QX, QY, or QZ) will be returned for correction or denied by virtually all payers, including Medicare. According to published anesthesia billing guidance, missing or incorrect modifiers account for a significant percentage of claim rejections in anesthesia billing. The modifier tells the payer who performed the service and under what supervision arrangement — it is not optional.
Can the Surgeon Bill CPT 00190 Using Modifier 47?
Modifier 47 (anesthesia by surgeon) is technically applicable when the operating surgeon personally administered regional or general anesthesia without an anesthesia provider present. However, this scenario is uncommon in the context of facial bone surgery and should be used only when clearly supported by documentation. Reporting 47 does not generate additional reimbursement above the usual fee and carries elevated audit risk if an anesthesia provider was present on the claim date.
Does CPT 00190 Require Prior Authorization?
CPT 00190 itself does not carry a universal prior authorization requirement, but authorization may be required for the underlying surgical procedure — and some payers extend that requirement to the associated anesthesia. For elective craniofacial procedures in particular, verify prior authorization requirements with each payer before scheduling, as denial of the surgical claim will cascade to the anesthesia claim.
Key Takeaways for Billing and Coding CPT 00190
- CPT 00190 is the default NOS anesthesia code for non-radical surgical procedures involving the facial bones or skull and carries 5 ASA base units.
- Reimbursement is calculated using the anesthesia formula — base units + time units × conversion factor — not the standard RVU-based fee schedule.
- The single most critical code selection decision is 00190 vs. 00192: reserve 00192 for radical surgery (including orthognathic procedures with prognathism correction); default to 00190 for fracture repairs, limited osteotomies, and benign bone excisions.
- Every 00190 claim requires a provider role modifier (AA, QK, QX, QY, or QZ); claims without one will be denied.
- Physical status modifiers (P1–P5/P6) are required by most payers and add billable units for P3 and above — omitting them is a common revenue leakage point.
- Separately billable anesthesia services such as arterial catheter placement (36620) and transesophageal echocardiography (93312) are not bundled into the 00190 base unit value and should be reported as distinct line items.
- Verify annual conversion factors through the CMS Anesthesiologists Center and confirm commercial payer rates via your contracted fee schedules to ensure accurate RVU and reimbursement rates calculations.
