CPT Code 01234: Anesthesia for radical resection of femur

Key Takeaways

CPT code 01234 describes anesthesia for open procedures involving the upper two-thirds of the femur; radical resection – used in oncologic bone tumor removal and similarly extensive femoral surgeries.

01234 carries 8 base units, the highest among the upper femur anesthesia codes, reflecting the greater complexity of radical resection compared to 01230 (6 units) and 01232 (5 units).

Physical status modifiers (P1-P6) and medical direction modifiers (AA, QK, QX, QY, QZ) are required for accurate billing; missing either is a common denial trigger.

Pabau’s claims management software helps anesthesia practices track time units, apply the correct modifiers, and reduce preventable claim denials across surgical specialties.

Radical femur resection is among the most extensive orthopedic oncology procedures performed today. When billing anesthesia services for it, CPT code 01234: anesthesia for radical resection of femur is the correct code – and getting the documentation and unit calculation right from the start prevents downstream denials that are difficult to recover.

According to the American Medical Association (AMA), which maintains the CPT code set, 01234 is classified under “Anesthesia for Procedures on the Upper Leg (Except Knee).” The full descriptor reads: Anesthesia for open procedures involving upper two-thirds of femur; radical resection. Multiple payer fee schedules including Pennsylvania DHS, Massachusetts Medicaid, New York eMedNY, and the Veterans Affairs Community Care Table H confirm this as a Tier 1 verified description.

For anesthesiologists and CRNAs using claims management software, understanding exactly what “radical resection” means clinically is essential – billing the code without documented evidence of radical resection is the single most common reason for medical necessity denials on this code family.

What qualifies as radical resection?

Radical resection in the context of CPT 01234 refers to surgical removal of bone, tumor, and surrounding tissue beyond the margin of the lesion, most commonly performed for primary bone tumors (such as osteosarcoma) or aggressive metastatic disease of the proximal femur. However, it is not used for standard fracture repair or routine femoral osteotomy.

CMS designates CPT 01234 as an inpatient-only (IPO) procedure for CY 2025, meaning you cannot bill it for outpatient or ambulatory surgery center settings under Medicare. Any claim submitted with an outpatient place-of-service code receives an automatic denial.

Base units for CPT code 01234 and how anesthesia time is calculated

CPT 01234 carries 8 base units, the highest of any code in the upper femur anesthesia group. The U.S. Department of Labor OWCP fee schedules (2015 and 2020), Massachusetts Medicaid, Pennsylvania DHS, and the VA Community Care Table H all confirm this figure at 8.0 base units.

Anesthesia billing uses the formula: Total Units = Base Units + Time Units + Qualifying Circumstance Units. Most payers calculate time units as one unit per 15 minutes of anesthesia time, though some payers use different intervals. For radical femoral resection, total anesthesia time commonly exceeds 3 hours, meaning time units alone can add 12 or more units to the claim.

Qualifying circumstances add-on codes can increase total units further. Code 99100 (patient of extreme age: younger than 1 or older than 70) adds 1 unit; 99116 (utilization of controlled hypotension) adds 5 units; 99135 (controlled hypotension) adds 5 units; and 99140 (emergency conditions) adds 2 units. Report these in addition to 01234, not in place of it.

Modifiers for CPT code 01234

Modifier selection is where many anesthesia claims go wrong. Virtually every 01234 claim requires both modifier categories: physical status and medical direction or supervision.

Physical status modifiers (P1-P6)

Physical status modifiers reflect the American Society of Anesthesiologists (ASA) patient classification at the time of service. The anesthesiologist determines the appropriate modifier – billing teams cannot assign it independently.

• P1 – Normal healthy patient
• P2 – Patient with mild systemic disease
• P3 – Patient with severe systemic disease
• P4 – Patient with severe systemic disease that is a constant threat to life
• P5 – Moribund patient not expected to survive without the operation
• P6 – Brain-dead patient for organ donation purposes

In practice, P3 or P4 is common for radical femur resection patients given the oncologic context. Many commercial payers add reimbursement units for P3 (1 unit) and P4 (2 units), though Medicare does not recognize additional physical status units.

Medical direction and supervision modifiers

Medical direction modifiers define the relationship between the anesthesiologist and any CRNAs involved in the case.

• AA – Anesthesiologist personally performed the anesthesia service
• QK – Medical direction of 2, 3, or 4 concurrent anesthesia procedures involving qualified practitioners
• QX – CRNA service with medical direction by a physician
• QY – Medical direction of one CRNA by an anesthesiologist
• QZ – CRNA service without medical direction by a physician

For example, Medicare pays 50% of the allowable rate to the anesthesiologist and 50% to the CRNA when QK/QX or QY/QX modifiers are used. When AA is billed, the anesthesiologist receives 100% of the allowable. Misapplying these modifiers is a common audit trigger for anesthesia groups billing under 01234.

Reimbursement for CPT code 01234 under Medicare and commercial payers

Medicare reimburses anesthesia using a conversion factor applied to total units. The Medicare anesthesia conversion factor changes annually with the Medicare Physician Fee Schedule (MPFS). Use the CMS Physician Fee Schedule lookup tool to find the current applicable conversion factor for your locality, as rates vary by geographic area.

For a typical radical femur resection case, the calculation might look like this:

• 8 base units (CPT 01234)
• 12 time units (3 hours at 1 unit per 15 minutes)
• 1 qualifying circumstance unit (99100 for patient over 70)
• 1 physical status unit (P3, if payer recognizes it)
• Total: 22 units x current conversion factor

Commercial payer rates vary significantly. Workers’ compensation billing under the Office of Workers’ Compensation Programs (OWCP) uses its own conversion factor tables, updated separately from MPFS. State Medicaid programs set their own rates – Pennsylvania, Massachusetts, and New York each publish their own anesthesia fee schedules that list 01234 at 8 base units. For real-time reimbursement estimates, the FastRVU 2026 RVU lookup tool provides locality-adjusted estimates based on CMS data.

Practices dealing with a high volume of anesthesia coding across coaching and therapy CPT codes or orthopedic specialties should verify conversion factors directly with each payer, as commercial rates typically exceed Medicare rates by 20-60% depending on the contract.

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CPT code 01234 vs 01230 vs 01232: choosing the right code

Selecting the wrong code within the upper femur anesthesia family is a frequent and auditable error. The three open-procedure codes cover distinct clinical scenarios, and payers cross-reference operative notes to verify the selection.

Use 01230 when the operative report describes an open femur procedure that does not involve amputation, radical resection, or any other specifically described subcategory. It carries 6 base units. Use 01232 when the procedure is amputation of the femur at or through the bone. It carries only 5 base units, reflecting the shorter typical anesthesia duration. Use CPT code 01234: anesthesia for radical resection of femur when the operative report specifically documents removal of tumor, surrounding tissues, or bone with oncologic or radical intent. It carries 8 base units.

Specifically, the operative report must explicitly use language consistent with “radical resection” to support 01234. Generic terms like “excision,” “resection,” or “debridement” without further qualifier will not pass clinical edit review at most payers. Anesthesia teams billing 01234 should request a copy of the surgeon’s operative report before submitting the claim. For practices also managing anesthesia for reproductive procedures, the same code-selection discipline applies when working with IVF procedure CPT codes.

When to consider 01250

CPT 01250 covers anesthesia for procedures on nerves, muscles, tendons, fascia, and bursae of the upper leg. If a radical femur resection also involves soft tissue work on these structures as the primary procedure, 01234 still takes precedence – the radical resection drives the code selection. 01250 is only appropriate when the primary procedure involves soft tissue structures rather than the femoral bone itself.

Documentation requirements for CPT code 01234

Strong documentation protects the claim and supports any post-payment audit. For CPT code 01234: anesthesia for radical resection of femur, the anesthesia record must capture the following.

• Pre-anesthesia evaluation – completed prior to the procedure, documenting ASA physical status classification (P1-P6), relevant medical history, medications, allergies, and airway assessment
• Anesthesia start and stop times – the exact time anesthesia was induced and the time the patient was transferred to recovery or post-anesthesia care; these drive time unit calculation
• Type of anesthesia – general anesthesia is standard for radical femur resection; regional adjuncts should be documented separately
• Intraoperative monitoring – ECG, pulse oximetry, capnography, temperature, and any invasive monitoring (arterial line, central venous pressure) relevant to the case complexity
• Qualifying circumstances – if 99100, 99116, 99135, or 99140 are reported, the clinical basis must appear in the record (e.g., patient age, controlled hypotension protocol, emergency designation)
• Medical direction documentation – if QK, QY, or QX modifiers are used, the anesthesiologist must document the seven CMS medical direction requirements including pre-anesthesia evaluation, prescribing the anesthesia plan, and being immediately available throughout the case

Orthopedic oncology practices and multi-specialty surgical centers using physical therapy EMR systems alongside surgical scheduling often manage documentation across separate platforms. Consolidating anesthesia records, consent forms, and time logs in one system reduces the risk of documentation gaps that trigger medical review. Practices managing ADHD screening CPT codes alongside surgical anesthesia billing face similar challenges when documentation lives in fragmented systems.

Common denial reasons and how to avoid them

CPT 01234 claims face several predictable denial patterns. Understanding these before submission is far less costly than working appeals.

• Inpatient-only setting mismatch – 01234 is an IPO code for CY 2025 under Medicare. Submitting with an outpatient place-of-service code (11, 22, 24) will generate an automatic denial. As a result, verify the admission status before billing.
• Missing or incorrect physical status modifier – Many payers pend claims without a P modifier. Payers reverse claims with a P modifier inconsistent with the pre-anesthesia evaluation documentation on audit.
• Time unit discrepancy – When billed time units exceed what the operative report supports, the excess is denied. Build the time calculation from documented times, not estimated surgical duration.
• Code selection not supported by operative note – Payers comparing 01234 to the surgeon’s operative report expect explicit “radical resection” language. Vague operative descriptions result in downcoding to 01230 and repayment demands.
• Qualifying circumstances not documented – Reporting 99100 or 99116 without the supporting clinical documentation in the anesthesia record is a fraud-and-abuse flag. Document the clinical basis or do not report the add-on code.

Plastic surgery practices managing oncologic reconstructive procedures alongside radical resection anesthesia billing can benefit from consolidated workflows. Practices using a plastic surgery EMR that integrates surgical notes with billing documentation reduce the reconciliation step that introduces errors. For broader reference, the AAPC Codify CPT lookup provides the full descriptor and parenthetical notes for 01234 and adjacent codes.

Practices dealing with complex diagnosis-specific coding across multiple specialties should also review their situational anxiety diagnosis coding workflows – the same modifier-documentation discipline that applies to anesthesia codes applies to diagnostic codes billed alongside surgical claims.

Additional CPT codes and ICD-10 diagnosis pairing for 01234

CPT 01234 is an anesthesia code only – it does not describe the surgical procedure. The surgeon bills the appropriate orthopedic oncology CPT code for the resection itself. The anesthesia claim is separate and billed by the anesthesia provider.

For the diagnosis, the ICD-10-CM code on the anesthesia claim should reflect the clinical reason for the radical resection. Common diagnoses linked to 01234 include primary malignant neoplasm of the femur (C40.2x, C40.3x), secondary malignant neoplasm of bone (C79.51), or pathological fracture in neoplastic disease (M84.552, M84.562). Accurate ICD-10 pairing supports medical necessity and reduces payer edits. Practices billing anesthesia across diverse case types, including those familiar with intraparenchymal hemorrhage ICD-10 codes, should apply the same pairing discipline here.

Report qualifying circumstances codes (99100, 99116, 99135, 99140) as secondary CPT codes, not as separate line items with their own units. They add to the total unit count for 01234 and appear on the same claim line in most payer systems.

Practices that use digital pre-operative consent forms and structured clinical notes can attach the relevant ICD-10 pairing at the point of documentation, reducing the manual reconciliation step before submission. For more complex coding scenarios across specialties, the procedure code fee schedule guide provides a useful reference framework.

Conclusion

CPT code 01234 is a high-stakes code. At 8 base units and inpatient-only status under Medicare, every submission requires precise modifier selection, accurate time documentation, and an operative record that explicitly supports radical resection. Errors on any of these dimensions result in denials, downcoding, or audit exposure.

Pabau’s claims management software helps anesthesia and surgical practices track procedure codes, manage modifier application, and maintain the documentation trail that supports accurate reimbursement. Strong HIPAA compliance for medical offices is part of that framework. To see how Pabau supports your billing workflows, book a demo.

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