CPT code 00192 describes anesthesia services provided for radical surgical procedures involving the facial bones or skull, explicitly including correction of prognathism (protrusion of the lower jaw). It carries 7 base units under the CMS anesthesia payment system — two units higher than its companion code, CPT 00190 — reflecting the greater complexity and duration typical of orthognathic and craniofacial reconstructive cases. This code applies exclusively in inpatient hospital settings for Medicare beneficiaries following its addition to the CMS inpatient-only (IPO) list in 2022.
What Does CPT Code 00192 Mean?
CPT 00192 is a surgical anesthesia code from the Anesthesia for Procedures on the Head subsection (CPT range 00100–00222), maintained by the American Medical Association. It identifies general or regional anesthesia administered by an anesthesiologist, CRNA, or anesthesiologist assistant for radical craniofacial bone surgery — cases that go beyond standard facial bone procedures in operative scope, duration, and physiological complexity.
Key attributes of this code at a glance:
- Billable status: Active, billable for professional anesthesia services
- Applicable setting: Inpatient hospital facility (inpatient-only for Medicare since 2022); inpatient or outpatient for commercial payers (verify per plan)
- Provider type: Anesthesiologist, CRNA, or anesthesiologist assistant
- Service category: Surgical anesthesia — head procedures
- Base units (CMS nationwide): 7
- MIPS participation: Yes — CPT 00192 is included in the Merit-Based Incentive Payment System (MIPS) program
- Code history: Added January 1, 1990; current descriptor effective January 1, 2001
What Procedures Does CPT 00192 Cover?
CPT 00192 covers anesthesia management for complex, radical surgeries on the facial bones or skull. The descriptor’s use of the term “radical” distinguishes these cases from minor or limited facial bone procedures.
Procedures appropriately covered under this code include:
- Orthognathic surgery (jaw realignment): mandibular sagittal split osteotomy, Le Fort I, II, and III osteotomies, bimaxillary osteotomy
- Correction of prognathism (mandibular or maxillary protrusion/retrusion) — explicitly named in the CPT descriptor
- Extensive craniofacial reconstructive surgery for congenital anomalies (e.g., craniosynostosis, midface hypoplasia)
- Radical resection of facial bone tumors involving significant osteotomy or reconstruction
- Complex facial fracture repair requiring extensive surgical exposure and bone manipulation
- Total temporomandibular joint (TMJ) replacement when involving radical bony restructuring
What Does CPT 00192 Specifically Exclude?
Not every procedure touching the face or skull falls under 00192. The following should not be coded with this code:
- Minor facial bone procedures (e.g., nasal bone fracture reduction, simple zygomatic arch reduction) → use CPT 00190
- Intracranial procedures (e.g., craniotomy, craniectomy for hematoma) → use CPT 00210 or 00211
- Skull drainage procedures → use CPT 00212 or 00214
- Cleft lip repair anesthesia → use CPT 00102
- Intraoral procedures (not involving bones) → use CPT 00170
- Any procedure where a more specific anesthesia code exists — CPT guidelines direct coders to the most specific code available
When Is CPT 00192 the Right Code to Use?
Selecting 00192 over 00190 (or other head anesthesia codes) hinges on the operative procedure’s scope, not the anesthesia technique. Use this code when all of the following conditions are met:
- Confirm the surgical procedure is “radical” in scope — meaning it involves significant bony restructuring, extensive osteotomy, or radical resection of facial bone/skull architecture
- Verify that prognathism correction, craniofacial reconstruction, or an equivalent skeletal procedure is documented in the operative report or surgical request
- Confirm the site is facial bones or skull — not intracranial structures (which would route to the 00210 series)
- Match the anesthesia code to the surgical procedure being performed — not the anesthesiologist’s technique or the patient’s diagnosis alone
- Confirm facility type and payer — for Medicare patients, 00192 must be performed in an inpatient hospital setting (IPO designation); for commercial payers, verify facility restrictions in the applicable contract
- Confirm no more specific anesthesia code exists for the exact procedure — review the full 00100–00222 range and ASA Crosswalk® before defaulting to 00192
How Does CPT 00192 Differ From CPT 00190?
The most common selection question anesthesia coders face is whether a facial bone case warrants 00190 or 00192. The core distinction is procedural complexity and the “radical surgery” threshold.
| Factor | CPT 00190 | CPT 00192 |
|---|---|---|
| Descriptor | Facial bones/skull; not otherwise specified | Radical surgery (including prognathism) |
| Base units (CMS) | 5 | 7 |
| Typical procedures | Zygomatic reduction, nasal fracture ORIF, simple mandibular repair | Orthognathic surgery, Le Fort osteotomies, craniofacial reconstruction |
| Prognathism correction | Not applicable | Explicitly included |
| Use when | No more specific code applies | Surgery is radical/extensive and involves major skeletal restructuring |
| Billing impact | Lower reimbursement (fewer base units) | Higher reimbursement (2 additional base units) |
In practice, anesthesia coders in oral-maxillofacial and craniofacial surgery settings report that 00192 is frequently undercoded — providers default to 00190 out of habit when the operative report clearly documents bilateral sagittal split osteotomies or Le Fort procedures. The 2-unit difference in base units translates directly into payment: at the 2025 Medicare anesthesia conversion factor of $20.44 per unit, those two additional base units represent approximately $40.88 in base payment before time units are added — and significantly more once time accrues on a case running 3–4 hours.
What Documentation Is Required to Support CPT 00192?
Accurate medical billing documentation requirements for CPT 00192 center on the anesthesia record and the surgical operative report. Because this is an anesthesia code — not a surgical code — the documentation burden is shared between the anesthesia provider and the operating surgeon.
What Must the Provider Document in the Anesthesia Record?
The anesthesia record must support the complexity level implied by 00192. Auditors will look for the following elements:
- Pre-anesthesia evaluation — pre-operative assessment documenting the patient’s physical status (ASA classification), airway assessment, pertinent medical history, and planned anesthetic approach
- Intraoperative anesthesia record — continuous documentation of vital signs, anesthetic agents administered, and physiologic responses throughout the case
- Start and stop times — precise anesthesia start and end times to support time-unit calculation (Medicare uses 15-minute time units)
- Provider identity and role — clear identification of the anesthesiologist and, if applicable, CRNA or AA and their supervisory relationship
- Anesthesia type — documentation of general, regional, or MAC (monitored anesthesia care) as applicable
- Post-anesthesia care unit (PACU) note — handoff documentation confirming safe emergence and transfer of care
- Physical status modifier — ASA physical status (P1–P6) documented in the pre-anesthesia evaluation; required for commercial payer billing (Medicare does not pay additional units for physical status)
What Are the Documentation Standards for Inpatient vs. ASC Settings?
| Documentation Element | Inpatient Hospital | Ambulatory Surgery Center |
|---|---|---|
| Medicare coverage for 00192 | Yes (required setting) | No — IPO list prohibits ASC billing for Medicare |
| Operative report required | Yes | Yes (for commercial payers) |
| Anesthesia record required | Yes | Yes |
| Physical status billed | No (Medicare) / Yes (commercial) | Commercial payers only |
| Qualifying circumstances add-ons | Commercial payers only | Commercial payers only |
How Does CPT 00192 Affect Medical Billing and Reimbursement?
Anesthesia RVU and reimbursement rates are calculated differently from standard CPT surgical codes. Rather than using a work RVU × conversion factor formula, anesthesia uses a unit-based model:
Payment = (Base Units + Time Units + Modifying Units) × Anesthesia Conversion Factor
For CPT 00192:
| Component | Value |
|---|---|
| Base units (CMS nationwide) | 7 |
| Time units | 1 unit per 15 minutes of anesthesia time (most payers) |
| Physical status units (P2–P6) | 0 (Medicare) / varies (commercial) |
| 2025 Medicare conversion factor | $20.44/unit |
| 2024 Medicare conversion factor | $21.12/unit |
| Commercial payer conversion factors | Typically $50–$80/unit (contract-specific) |
Illustrative example: A 3-hour (180-minute) case coded with 00192 at Medicare rates = 7 base units + 12 time units = 19 total units × $20.44 = $388.36 (before physical status or qualifying circumstances modifiers for commercial payers).
Key payer considerations:
- Medicare does not separately reimburse qualifying circumstances codes (99100–99140) — these are bundled into the base rate per the CMS Physician Fee Schedule status indicator “B”
- Commercial payers frequently pay additional units for physical status (P3 adds 1 unit, P4 adds 2 units, etc.) — verify per contract
- Per the CMS Medicare Claims Processing Manual (Chapter 12), anesthesia time begins when the anesthesiologist begins preparing the patient for induction and ends when the anesthesiologist is no longer in personal attendance
What Modifiers Are Commonly Used With CPT 00192?
| Modifier | Description | When to Apply | Payment Impact |
|---|---|---|---|
| AA | Anesthesia personally performed by anesthesiologist | Anesthesiologist performs entire case alone | 100% of allowed rate |
| QK | Medical direction of 2–4 concurrent CRNA/AA procedures | MD supervising 2–4 concurrent cases | 50% of allowed rate |
| QY | Medical direction of one CRNA/AA | MD supervising exactly one CRNA or AA | 50% of allowed rate |
| QX | CRNA service with physician medical direction | CRNA performing case under MD direction | 50% of allowed rate |
| QZ | CRNA service without medical direction | CRNA performing independently (not all payers cover) | Varies by payer |
| AD | Medical supervision >4 procedures | MD overseeing 5+ concurrent procedures | Reduced / limited |
| P1–P6 | Physical status (P1=normal healthy to P6=brain-dead) | All anesthesia claims (commercial payers require; Medicare informational only) | Adds units (commercial) |
| 23 | Unusual anesthesia | Procedure normally not requiring general anesthesia now does due to unusual circumstances | May support higher payment |
| 22 | Increased procedural services | Work substantially greater than typical (e.g., field avoidance, extreme positioning) | Must submit documentation |
Note: Do not apply E/M-style modifiers (e.g., -25, -59) to anesthesia codes. These modifiers do not apply in the anesthesia billing framework.
Are There Prior Authorization, Coverage Restrictions, or LCD Requirements?
- Medicare IPO restriction: CPT 00192 is on the CMS inpatient-only list (added 2022). Medicare will not cover this code when performed in an ASC or outpatient hospital setting. Ensure site-of-service matches POS code 21 (inpatient hospital) for Medicare claims.
- Commercial payer prior authorization: Orthognathic surgery (the most common underlying procedure) frequently requires prior authorization from commercial payers based on medical necessity documentation — including cephalometric radiographs, documentation of functional impairment, and failure of conservative treatment. Authorization is for the surgical procedure; verify that anesthesia is included in the authorization or covered automatically.
- Medicare qualifying circumstances (99100–99140): These add-on codes are assigned status “B” (bundled) on the CMS Physician Fee Schedule and are not eligible for separate Medicare reimbursement. Report them for commercial payers when applicable and documented.
- Medical direction documentation — 7 steps: When billing under QK or QY modifiers, the anesthesiologist must document completion of all seven CMS medical direction requirements in the record.
What CPT Codes Are Commonly Billed Alongside CPT 00192?
Because 00192 is an anesthesia code, it is paired with the underlying surgical procedure code — not billed as a standalone service. Common surgical code pairings include:
| Associated Surgical CPT | Description | Typical Pairing Context | Bundling Risk |
|---|---|---|---|
| 21141 | Le Fort I osteotomy; single piece | Maxillary advancement for Class III malocclusion | No |
| 21142–21147 | Le Fort I (multiple pieces); Le Fort II/III | Complex midface advancement | No |
| 21193–21196 | Reconstruction of mandibular rami | Bilateral sagittal split for prognathism | No |
| 21198 | Osteotomy, mandible, multisegmental | Complex orthognathic correction | No |
| 21208–21209 | Osteoplasty, facial bones | Contouring of facial skeleton | No |
| 21299 | Unlisted craniofacial surgery | When no specific code fits | Higher audit risk |
| +99100 | QC: Anesthesia for patient <1 yr or >70 yrs | Pediatric craniofacial cases; elderly patients | Bundled for Medicare |
| +99140 | QC: Anesthesia complicated by emergency | Emergency airway or trauma craniofacial | Bundled for Medicare |
Which Code Combinations Trigger NCCI or CCI Edits?
- 00192 does not have a direct surgical procedure pair edit — anesthesia codes and surgical CPT codes operate in separate payment tracks and are not subject to standard NCCI procedure-to-procedure (PTP) edits in the same way
- Do not report 00190 and 00192 together for the same patient encounter — these are mutually exclusive for the same anesthetic episode
- Do not report 00192 with intracranial procedure anesthesia codes (00210 series) — site-of-service distinctness is required if separate procedures are performed
- Verify the ASA Relative Value Guide (RVG) Crosswalk when the operative report includes multiple surgical procedures — the correct anesthesia code should reflect the procedure with the highest base unit value, not each procedure separately
What Coding Errors Should You Avoid With CPT 00192?
Anesthesia billing for radical facial bone procedures generates a predictable pattern of avoidable errors. Ranked by audit frequency and compliance risk:
- Defaulting to CPT 00190 when the procedure clearly meets the 00192 threshold. The “radical surgery including prognathism” qualifier is not ambiguous — bilateral sagittal split osteotomies and Le Fort procedures belong under 00192. Systematic underuse of 00192 results in revenue leakage.
- Billing CPT 00192 for outpatient or ASC claims under Medicare. Since CMS added 00192 to the IPO list in 2022, any Medicare claim submitted with a non-inpatient place of service will be denied.
- Omitting or incorrectly applying the payment modifier (AA, QK, QX, QY, QZ). Claims submitted without a required anesthesia payment modifier in the first modifier position will be denied by most payers, including Medicare.
- Incorrect time unit calculation. Anesthesia time must reflect the actual start and end times documented in the anesthesia record. Rounding up, using surgical incision-to-close time, or using estimated times not supported by the record all constitute errors.
- Applying qualifying circumstances codes (99100–99140) to Medicare claims. These are bundled under Medicare and will deny. Billing teams should maintain payer-specific templates that suppress these codes on Medicare and Medicaid claims.
- Misidentifying the supervising anesthesiologist’s role. If an anesthesiologist supervised five or more concurrent cases, modifier AA or QK cannot be applied — the correct modifier is AD, which reimburses at a substantially lower rate.
- Using modifier 22 without supporting documentation. Some coders append -22 (increased procedural services) to 00192 for unusually complex cases without submitting a cover letter explaining the extraordinary circumstances. Payers will deny or reduce without documentation.
What Do Auditors and RAC Reviewers Look for When Reviewing CPT 00192 Claims?
Auditors and Recovery Audit Contractor (RAC) reviewers targeting anesthesia claims for radical facial bone surgery commonly flag:
- Time documentation gaps — anesthesia record start/stop times missing, illegible, or inconsistent with OR log
- Place-of-service mismatches — 00192 billed at POS 24 (ASC) under Medicare
- Absent or incomplete pre-anesthesia evaluation — required before each general anesthetic to support medical necessity and physical status assignment
- Modifier stacking errors — incorrect combination of payment and informational modifiers (e.g., AA + QK on the same claim)
- Operative report–anesthesia code mismatch — the operative procedure documented does not clearly meet the “radical surgery” threshold required for 00192
How Does CPT 00192 Relate to Other Anesthesia Codes?
Understanding 00192’s position within the head anesthesia code family is essential for accurate selection and revenue cycle compliance.
| Related Code | Relationship Type | Base Units | Key Distinction |
|---|---|---|---|
| 00190 | Parent / less-specific alternative | 5 | Facial bones/skull NOS; use when procedure is NOT radical |
| 00192 | More specific (radical surgery) | 7 | Radical surgery including prognathism; the subject of this guide |
| 00102 | Separate — cleft lip | 6 | Specific to cleft lip repair only |
| 00170 | Separate — intraoral | 5 | Intraoral procedures not involving bone reconstruction |
| 00176 | Separate — radical intraoral | 8 | Radical intraoral surgery (e.g., extensive floor of mouth) |
| 00210 | Separate — intracranial NOS | 11 | Intracranial procedures; much higher complexity |
| 00215 | Separate — cranioplasty/skull fracture | 9 | Skull fracture repair, cranioplasty — higher base than 00192 |
| 99100–99140 | Add-on qualifying circumstances | 1–5 (commercial) | Bundled for Medicare; reportable for commercial payers when documented |
What Is the Correct Code Sequencing or Reporting Order?
- Report the primary anesthesia CPT code (00192) first on the claim
- Append the appropriate HCPCS payment modifier (AA, QK, QX, QY, QZ) immediately after the primary code
- Append the physical status modifier (P1–P6) — required for commercial payers; informational for Medicare
- Report qualifying circumstances codes (99100, 99116, 99135, 99140) as separate line items on the same claim when applicable (commercial payers only)
- Do not report time units in the procedure unit field on the CMS-1500 form — instead, enter the total anesthesia units (base + time + modifying) in Box 24G per Medicare instructions, or verify your payer’s specific claim format requirements
Real-World Coding Scenario — How CPT 00192 Is Applied in Practice
Patient scenario: A 24-year-old patient with severe Class III skeletal malocclusion and documented chewing difficulty for 18 months is admitted to an inpatient hospital for bilateral mandibular sagittal split osteotomy with bicortical screw fixation plus Le Fort I osteotomy (bimaxillary orthognathic surgery). The anesthesiologist (solo, no CRNA) performs general endotracheal anesthesia. Anesthesia time: 4 hours 22 minutes (262 minutes). The patient has no significant systemic disease (ASA P1). Payer: commercial insurer.
Correct Code Application
- Primary code: CPT 00192 — radical surgery of facial bones including prognathism (bilateral sagittal split + Le Fort I qualifies as radical skeletal reconstruction)
- Payment modifier: AA — anesthesia performed personally by the anesthesiologist
- Physical status: P1 — normal healthy patient (commercial payer may add 0 modifying units for P1; P2 would add 1 unit for some payers)
- Time units: 262 minutes ÷ 15 = 17.47 → 17 time units (round down per Medicare; some commercial payers round to nearest decimal)
- Total units billed: 7 (base) + 17 (time) = 24 units
- Qualifying circumstance: None applicable (patient is 24 years old, no emergency, no hypothermia or hypotension utilized)
Common Mistake in This Scenario
- Incorrect code: CPT 00190 with modifier AA
- Why it fails: The operative report documents bilateral sagittal split osteotomy and Le Fort I osteotomy — a classic bimaxillary orthognathic procedure that explicitly meets the “radical surgery including prognathism” threshold of 00192. Defaulting to 00190 (NOS) when a more specific, higher-value code is supported by documentation constitutes both a coding error and a revenue integrity failure.
- Revenue impact: At a commercial conversion factor of $65/unit, the 2-unit base difference between 00190 and 00192 = $130 lost per case. Across a high-volume oral-maxillofacial practice, this error pattern compounds quickly.
Frequently Asked Questions About CPT Code 00192
Is CPT Code 00192 Still Valid for Use in 2025 and 2026?
CPT code 00192 remains a valid, active anesthesia code with no descriptor changes through 2026. Coders should verify annually against the AMA CPT Professional Edition and the CMS Physician Fee Schedule for any updates to base units, coverage status, or IPO designation. The code was added to the CMS inpatient-only list in 2022 — that restriction remains in effect for Medicare billing as of the current publication date.
What Is the Difference Between CPT 00190 and CPT 00192?
CPT 00190 covers anesthesia for facial bone or skull procedures that are “not otherwise specified,” while 00192 applies specifically to radical surgery including prognathism correction. The key differentiator is whether the operative report documents extensive osteotomy, craniofacial reconstruction, or prognathism correction — if so, 00192 is the appropriate code and carries 7 base units versus 5 for 00190.
Can CPT 00192 Be Billed at an Ambulatory Surgery Center for Medicare Patients?
No. CPT 00192 was placed on the CMS inpatient-only (IPO) list effective 2022, which means Medicare will not reimburse this code when the place of service is an ASC or outpatient hospital department. For Medicare beneficiaries, the underlying surgery requiring 00192 must be performed in an inpatient hospital setting (POS 21). Commercial payer restrictions vary; verify each plan’s policy.
How Are Anesthesia Time Units Calculated for CPT 00192?
Anesthesia time is recorded in 15-minute increments for Medicare. Time begins when the anesthesiologist begins preparing the patient for induction and ends when the provider is no longer in personal attendance. The total time units (anesthesia minutes ÷ 15, rounded down for Medicare) are added to the 7 base units for 00192 to calculate total billable units before applying the conversion factor.
What Physical Status Modifier Should Be Reported With CPT 00192?
Physical status modifiers P1 through P6 should be appended based on the patient’s pre-operative condition as assessed in the pre-anesthesia evaluation. Medicare does not pay additional units for physical status — it is informational only for Medicare claims. However, most commercial payers recognize physical status and will add 0–5 modifying units depending on the P-level. Failing to document and bill the correct physical status modifier for commercial payers results in lost reimbursement that cannot typically be retroactively corrected without an appeal.
Can Qualifying Circumstance Codes Like 99100 Be Billed With CPT 00192?
Qualifying circumstance codes (99100–99140) may be reported alongside 00192 for commercial payers when the clinical circumstances are documented — for example, +99100 for a patient over 70 undergoing craniofacial surgery. However, Medicare and most Medicaid programs assign these codes a status indicator of “B” (bundled) on the CMS Physician Fee Schedule, meaning they are not separately reimbursable under government programs. Billing teams should maintain payer-specific claim templates to avoid submitting these codes on Medicare claims.
What Is the 2025 Medicare Anesthesia Conversion Factor?
The 2025 Medicare anesthesia conversion factor is $20.44 per anesthesia unit, a decrease from $21.12 in 2024. This rate applies nationally before geographic adjustment (GPCI). For CPT 00192, a straightforward 3-hour case at the national rate produces approximately 7 + 12 = 19 units × $20.44 = $388.36 in allowable base payment, before physical status or qualifying circumstance unit additions from commercial payers.
Key Takeaways for Billing and Coding CPT 00192
- CPT 00192 is the correct code when the operative report documents radical facial bone or skull surgery — including prognathism correction, bilateral osteotomies, and major craniofacial reconstruction; do not default to CPT 00190 when 00192’s threshold is met
- The code carries 7 CMS nationwide base units, compared to 5 for CPT 00190 — a 2-unit difference with direct reimbursement impact at every conversion factor
- Medicare IPO restriction: Since 2022, CPT 00192 is on the CMS inpatient-only list and cannot be billed for Medicare patients in ASC or outpatient settings
- Always append the correct HCPCS payment modifier (AA, QK, QX, QY, QZ) in the first modifier position — omission is the leading cause of anesthesia claim denials
- Physical status modifiers (P1–P6) are required for commercial payer billing and represent lost revenue if omitted; Medicare does not pay additional units for physical status
- Qualifying circumstance codes 99100–99140 are bundled for Medicare (status “B” on the CMS Physician Fee Schedule) but may be separately billable to commercial payers with proper documentation
- Anesthesia time documentation must be precise — start and stop times in the anesthesia record must support the time units billed, and discrepancies with the OR log are a primary coding audit trigger
- Verify the ASA Relative Value Guide (RVG) Crosswalk for correct anesthesia code assignment when the operative report includes multiple surgical procedures
For the most current base unit values and conversion factor updates, consult the CMS Physician Fee Schedule lookup tool and the CMS Medicare Claims Processing Manual, Chapter 12. For anesthesia code crosswalk reference, the American Society of Anesthesiologists (ASA) Relative Value Guide and the AMA CPT code set remain the definitive sources.
