CPT Code 01474: Anesthesia for gastrocnemius recession

Key Takeaways

CPT Code 01474 covers anesthesia for gastrocnemius recession (e.g., Strayer procedure) — a soft-tissue procedure that lengthens the calf muscle, not an open-bone or fracture procedure.

The code carries 5 base units per the ASA Relative Value Guide. Reimbursement uses the formula: (base units + time units) x conversion factor.

01474 is easy to confuse with 01472 (Achilles tendon repair) and 01480 (open bone procedures). All three sit in the same lower-leg anesthesia family but describe different structures.

Practice management software like Pabau helps anesthesia practices track procedure codes, attach correct modifiers, and reduce claim denials for codes like 01474.

Anesthesia claim denials for lower-extremity orthopedic and podiatric cases often trace back to one avoidable error: billing CPT 01474 as if it were an open-bone or fracture procedure, when it actually describes anesthesia for a soft-tissue release — gastrocnemius recession. Getting the code right before submission saves the rework cycle entirely.

CPT Code 01474: Definition and procedure scope

Official description: Anesthesia for procedures on nerves, muscles, tendons, and fascia of lower leg, ankle, and foot; gastrocnemius recession (e.g., Strayer procedure).

CPT Code 01474 applies when an anesthesiologist or CRNA provides anesthesia services during a gastrocnemius recession — a surgical procedure that lengthens the gastrocnemius (calf) muscle to correct gastrocnemius equinus, a tightness in the calf that limits how far the ankle can flex upward (dorsiflexion).

The Strayer technique, the most common approach, separates the gastrocnemius from the soleus and releases it just above the gastrocnemius-soleus aponeurosis so the muscle can retract and lengthen. This is a soft-tissue procedure — it does not involve cutting or fixating bone, which is why it sits apart from the lower leg’s open-bone codes.

Per the American Medical Association (AMA), CPT codes in the anesthesia section (00100-01999) report the anesthesia service itself, not the surgical procedure. The surgeon’s operative code (typically CPT 27687 for an open gastrocnemius recession) documents the procedure. CPT 01474 documents the anesthesia management.

Gastrocnemius recession is most often performed to treat gastrocnemius equinus that is contributing to chronic plantar fasciitis, diabetic foot ulceration, midfoot arthritis, or equinus deformity in patients with neurologic conditions such as cerebral palsy.

Surgeons typically confirm the diagnosis with a Silfverskiold test: if ankle dorsiflexion improves with the knee bent but stays limited with the knee straight, the tightness is isolated to the gastrocnemius and a recession is indicated, rather than a full Achilles tendon lengthening.

Anesthesia base units for CPT 01474

CPT 01474 carries 5 base units per the ASA Relative Value Guide (ASA RVG) — a value confirmed across the VA Community Care Nationwide Base Units Table H and multiple state Medicaid fee schedules.

Base units reflect the complexity and risk associated with the anesthesia service for this procedure category. Individual payers may negotiate different unit values, but the ASA RVG value is the standard reference for Medicare and most commercial contracts.

Total anesthesia billing units follow this formula, as established by CMS:

Worked example: A 60-minute open gastrocnemius recession with no qualifying circumstances. Time units = 60 ÷ 15 = 4. Total units = 5 (base) + 4 (time) = 9. Multiply by the applicable conversion factor to calculate the reimbursement amount.

Accurate start-to-stop anesthesia time documentation is required on the claim. Missing time documentation is the most common reason for time-unit denials.

Practices using claims management software can attach the correct base unit value and time units to anesthesia codes during charting, reducing manual calculation errors before submission.

Modifiers for CPT Code 01474

Anesthesia modifier selection determines who performed the service and the level of supervision involved. Using the wrong modifier is a compliance risk and frequently triggers audits or reduced reimbursement. The AAPC modifier guidelines and CMS anesthesia billing rules govern these selections.

CRNA supervision and billing rules vary by payer and state. Review individual payer policies before selecting between QZ and QX. Medicare follows CMS Pub. 100-04, Chapter 12 for anesthesia modifier rules. Commercial payers may differ. When a practice submits anesthesia claims, the modifier must accurately reflect who supervised the case.

CPT Code 01474 reimbursement and fee schedule 2026

Medicare anesthesia reimbursement is calculated using the formula: (Base Units + Time Units) x Anesthesia Conversion Factor (ACF). The ACF is published annually by CMS and varies by geographic payment locality. For 2026, verify the current ACF in the CMS fee schedule tool.

Geographic Payment Complexity Index (GPCI) adjustments mean that a practice in a high-cost metropolitan area receives a higher conversion factor than one in a rural locality. Always check the locality-specific ACF before estimating reimbursement for CPT 01474 claims.

Use the FastRVU 2026 lookup tool to check current Medicare reimbursement values by locality for anesthesia codes. Do not rely on prior-year conversion factors. The 2026 ACF must be confirmed from CMS published data.

Documentation requirements for CPT Code 01474

Clean CPT 01474 claims depend on documentation that tells the clinical story a payer needs to validate medical necessity. Three record types carry most of the evidentiary weight.

The anesthesia record

This is the primary billing support document. It must capture:

• Patient demographics and date of service
• The surgical procedure being performed (gastrocnemius recession/Strayer procedure)
• The anesthesia provider’s name and credentials
• Documented start and stop times for anesthesia
• Continuous monitoring data (blood pressure, heart rate, oxygen saturation)
• Drugs administered with doses and times
• Any intraoperative events that affected the anesthesia course

The time entries on this record must reconcile with the units billed. A claim for 8 time units on a 01474 procedure requires a record showing 120 minutes of anesthesia time (at the 15-minutes-per-unit rate). Discrepancies are a primary target in payer post-payment audits.

Pre-operative evaluation and conservative treatment history

Because gastrocnemius recession is a surgical response to a documented contracture, payers look for evidence that the diagnosis is well-supported and that conservative treatment was tried first.

The surgical record should include the Silfverskiold test result (ankle dorsiflexion with the knee extended versus flexed) and a summary of failed conservative measures, such as weeks of gastrocnemius-specific stretching or bracing.

Vague language (“patient has tight calf muscles”) will not sustain medical necessity under audit. The note should quantify the dorsiflexion deficit and name the underlying condition being addressed, whether that is chronic plantar fasciitis, a diabetic foot ulcer, or a neurologic equinus deformity.

Practices that implement standardized pre-operative evaluation templates in clinical documentation software see fewer medical necessity denials because the documentation captures required elements by default.

Operative report and medical necessity linkage

The surgeon’s operative report confirms what procedure was performed. The anesthesia code 01474 must be logically consistent with the surgical CPT code reported, typically CPT 27687 for an open gastrocnemius recession.

If the operative report instead describes an Achilles tendon repair, 01472 is the appropriate anesthesia companion code, not 01474. If it describes an open procedure on bone (an ORIF, osteotomy, or bone biopsy), 01480 or a more specific bone-procedure code applies instead.

Maintaining HIPAA-compliant clinical documentation across the anesthesia record, pre-operative note, and operative report is the foundation of a defensible 01474 claim. These three documents should tell the same story.

ICD-10 diagnosis codes commonly billed with CPT 01474

Anesthesia claims for CPT 01474 must include an appropriate ICD-10-CM diagnosis code that supports medical necessity for a gastrocnemius recession.

Because the procedure treats a soft-tissue contracture rather than a fracture, the diagnosis codes paired with it look very different from those paired with an open-bone code like 01480. ICD-10-CM specificity requirements include laterality (right/left/unspecified).

ICD-10-CM codes must reflect the FY2026 code set. Specificity matters: submitting an unspecified laterality code (M67.00) when the operative note clearly documents a left-sided procedure (M67.02) is a preventable specificity denial.

Bone-continuity disorders such as M84.9 belong with bone-procedure codes like 01480, not with the soft-tissue code 01474. Pairing a bone-condition diagnosis with 01474 is a mismatch payers flag quickly.

A claim for 01474 paired with a fracture diagnosis (an S82.x code) will draw payer scrutiny, since fracture diagnoses support an open-bone anesthesia code, not a soft-tissue release.

Qualifying circumstances that may apply

Qualifying circumstance codes are add-on codes billed alongside CPT 01474 when specific clinical conditions increase the complexity of anesthesia management. These are reported in addition to, not instead of, the primary anesthesia code. Not all payers accept qualifying circumstance codes. Verify payer policy before billing.

Code 99100 is the most commonly applicable for CPT 01474 cases, particularly in older patients undergoing gastrocnemius recession as part of diabetic foot ulcer management or pediatric patients treated for neurologic equinus.

Code 99140 applies when the procedure is an emergency, not elective — uncommon for this code, but possible when a recession is added to an urgent case.

Document the qualifying condition clearly in the anesthesia record. Unsupported qualifying circumstance codes are a frequent audit finding.

Related CPT codes in the lower leg anesthesia family

Selecting the right code from the lower-leg anesthesia range requires understanding which anatomical structure each code covers — bone versus soft tissue — and, within the soft-tissue codes, which specific procedure applies.

Review this comparison before finalizing code selection. For anesthesia on the adjacent knee and distal femur, also consider CPT 01340.

The most common selection error is using 01474 (gastrocnemius recession) when 01472 (Achilles tendon repair) applies, or vice versa. Both are soft-tissue codes in the same family and carry the same 5 base units, so the financial impact of a mix-up is small. The compliance risk from billing a code that doesn’t match the operative report is not.

A second common error is confusing 01474 with 01480, since 01474 is a soft-tissue code and 01480 is a bone code, despite 01480 carrying fewer base units. Read the operative report carefully before selecting a code.

Common billing errors and how to avoid them

Denials for CPT 01474 cluster around a handful of recurring errors. None require complex resolution, and all are preventable at the pre-submission stage.

• Confusing 01474 with 01480. 01474 is a soft-tissue code (gastrocnemius recession). 01480 is an open-bone code (ORIF, osteotomy, bone biopsy). If the operative report describes cutting or fixating bone, 01474 is wrong. Payers identify this via operative report review or claim edit rules.
• Confusing 01474 with 01472. Both are soft-tissue codes with the same base units, but 01472 is specific to Achilles tendon repair. Confirm which structure the surgeon actually released before selecting a code.
• Missing or incorrect modifier. Submitting 01474 without a required anesthesia modifier (AA, QZ, QX, etc.) causes rejection. The modifier must reflect the actual supervision arrangement, not the usual arrangement at your facility.
• Inaccurate time unit reporting. Round-number time entries (30, 45, 60 minutes exactly) attract scrutiny. Document actual elapsed anesthesia time in minutes and retain the anesthesia record to support the claim.
• Unsupported qualifying circumstance codes. Billing 99100 or 99140 without clinical documentation supporting the qualifying condition is a compliance risk. Document the patient’s age (for 99100) or the emergency nature of the case (for 99140) explicitly in the anesthesia record.
• Incorrect ICD-10 pairing. Submitting a fracture diagnosis code alongside 01474, or an unspecified laterality code when the operative note documents a side, reduces payment or triggers a medical necessity denial.

Using digital documentation tools that capture anesthesia start and stop times during the procedure reduces time-unit calculation errors significantly.

A structured medical forms process in practice management workflows supports the audit trail needed to defend qualifying circumstance claims.

How Pabau supports anesthesia billing workflows

Anesthesia practices and surgical facilities that manage high volumes of orthopedic and podiatric cases need reliable procedure code libraries and claim-scrubbing tools. Errors on codes like CPT 01474 create rework that consumes billing staff time.

Pabau’s claims management software, part of the Pabau practice management platform, lets practices maintain a procedure code library with correct base units, attach modifiers at the point of charting, and flag modifier-code mismatches before claims are submitted.

For practices that generate anesthesia charting notes, Pabau’s AI documentation tools support structured note generation that captures the clinical detail needed to support qualifying circumstance codes and time documentation.

Practices in orthopedic, sports medicine, and physical therapy settings handling post-operative care alongside surgical cases can use Pabau’s workflow automation to route billing tasks to the correct team at the right time.

Conclusion

CPT Code 01474 is a common anesthesia code in orthopedic and podiatric settings, but it is also one of the most frequently mis-submitted — largely because it’s easy to confuse with its soft-tissue and open-bone neighbors in the same code family.

The gastrocnemius-recession-only scope, 5 base units, correct modifier requirement, and ICD-10 specificity rules are all well-defined. Following them consistently prevents the denial cycle.

Pabau’s claims management tools help anesthesia practices attach modifiers accurately, document time units cleanly, and catch code-modifier mismatches before submission. To see how Pabau handles anesthesia billing workflows, book a demo.

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