CPT Code 00474: Anesthesia for radical partial rib resection

Key Takeaways

CPT Code 00474 covers anesthesia for partial rib resection involving radical procedures, with pectus excavatum as the canonical example.

The code carries 13.0 ASA base units, confirmed by the VA Community Care base unit table and state Medicaid fee schedules.

Use 00474 only for radical rib procedures; non-radical partial resection maps to 00470, and thoracoplasty maps to 00472.

Pabau’s claims management software automates anesthesia billing workflows, reducing claim errors on complex surgical codes like 00474.

Anesthesia billing for thoracic procedures is where claim errors concentrate. The 00474 CPT code sits near the top of that risk list because coders frequently confuse it with its neighbors, 00470 and 00472, and because the radical procedure distinction is easy to miss when operative reports use imprecise language. Getting this wrong delays reimbursement and exposes practices to audit scrutiny. This reference covers everything anesthesia coders and billers need to bill claims management software correctly for CPT Code 00474, from the official descriptor and base units through modifiers, ICD-10 crosswalks, and payer documentation requirements.

The code range 00400-00474 covers anesthesia for all procedures on the thorax, including the chest wall and shoulder girdle. Within that range, 00474 is the highest-complexity code because it applies only when rib resection is both partial and radical in nature. Understanding when that threshold is met, and how to document it, is what separates a clean claim from a denial.

CPT Code 00474: Definition and clinical description

CPT Code 00474 is defined by the American Medical Association (AMA) as: Anesthesia for partial rib resection; radical procedures (eg, pectus excavatum). That full 00474 CPT code description is the wording to match against the operative note. The parenthetical reference to pectus excavatum is not exhaustive; it is the canonical example of a condition requiring radical chest wall reconstruction that involves rib cartilage or bone removal beyond a simple resection.

The critical word here is “radical.” Radical rib procedures involve extensive dissection and reshaping of the chest wall framework, typically to correct structural deformities or to create surgical access for underlying pathology. Simple or limited rib resections, even when partial, do not meet this threshold. Coders who apply 00474 to routine rib removal are upcoding, which triggers NCCI edit flags and payer audits.

Common procedures that justify 00474 billing include the Nuss procedure and the Ravitch procedure for pectus excavatum correction, as well as radical thoracic outlet decompression involving first rib resection when performed with extensive chest wall mobilization. Pectus excavatum anesthesia is the textbook case for this code, but any radical chest wall reconstruction of comparable scope can qualify. Consult the operative note for plastic surgery EMR software documentation confirming the extent of dissection before assigning this code.

ICD-10 crosswalk for CPT 00474

Anesthesia codes require a linked surgical diagnosis for medical necessity. The related ICD-10 diagnostic codes most commonly crosswalked with CPT 00474 fall into the congenital chest wall deformity and acquired thoracic disease categories. Payers examine diagnosis-code alignment on anesthesia claims more closely than on many other specialties, because the base unit value is substantial.

Payers may also accept J95.89 (other post-procedural complications of the respiratory system) as a secondary diagnosis when anesthesia is administered for revision procedures. Always link the diagnosis code to the surgical indication, not to the anesthesia service itself. For a broader overview of ICD-10 diagnostic code crosswalk practices, refer to your facility’s coding compliance guidelines.

Base units and anesthesia billing formula

CPT Code 00474 carries 13.0 ASA base units, confirmed by the VA Community Care nationwide anesthesia base unit table (v3-27) and the Massachusetts Medicaid anesthesia fee schedule. This is among the higher base unit values in the thorax range (00400-00474), reflecting the complexity and duration of radical rib resection procedures.

Anesthesia billing uses a formula distinct from standard surgical billing. The allowed amount is calculated as:

• Total units = Base units + Time units + Physical status modifier units + Qualifying circumstance units
• Time units = Total anesthesia minutes divided by 15 (one unit per 15-minute increment, per CMS convention; some commercial payers use 10-minute increments)
• Allowed amount = Total units x Conversion factor (the Medicare anesthesia conversion factor is updated annually; consult the CMS Physician Fee Schedule lookup for current year values)

For a procedure lasting 150 minutes under Medicare billing (15-minute time increments): Time units = 10. Total units = 13 (base) + 10 (time) + physical status modifier units. At a hypothetical anesthesia conversion factor of $23.00, a P2 patient (0 additional units) would yield approximately $529 in allowed charges before geographic adjustment. Actual reimbursement varies by MAC jurisdiction, payer contract, and facility type. Use the FastRVU 2026 lookup tool for current conversion factor values by locality.

The surgical procedure anesthesia codes in adjacent ranges follow the same base-unit-plus-time formula. Understanding the formula is essential before diving into modifier stacking for complex cases.

Applicable modifiers for CPT 00474

Modifier selection directly affects both reimbursement and medical review priority. CPT 00474 accepts several modifier categories; applying them correctly is what separates a paid claim from a request for additional documentation.

Physical status modifiers (P1-P6)

Physical status modifiers are assigned by the anesthesiologist and reflect patient comorbidity at the time of service. They add base units to the claim for higher-risk patients.

Medicare does not separately reimburse physical status modifiers, though they must still appear on the claim. Most commercial payers do recognize P3-P5 as adding billable units. Verify your payer contract before including unit additions in your billing calculation.

Care team and provider role modifiers

These modifiers communicate who provided anesthesia and in what supervision arrangement. They are required on nearly every anesthesia claim and affect both payment rate and carrier review priority.

• AA: Anesthesia services personally performed by the anesthesiologist
• QK: Medical direction of two, three, or four concurrent anesthesia procedures by an anesthesiologist
• QX: CRNA service with medical direction by a physician
• QZ: CRNA service without medical direction
• QY: Medical direction of one CRNA by an anesthesiologist
• AD: Medical supervision by a physician, more than four concurrent procedures

For 00474, the high complexity of the procedure means most payers expect AA or QK billing. QZ claims on radical rib resection cases draw heightened scrutiny because CRNAs operating without physician oversight on major chest wall reconstruction procedures raise medical necessity questions. Document the supervision arrangement explicitly in the anesthesia record. Use digital anesthesia consent forms to capture provider role attestation at the point of care, reducing documentation gaps on complex surgical anesthesia claims.

Qualifying circumstances add-on codes