Surgical lengthening of the gastrocnemius muscle at its aponeurosis to relieve equinus contracture and restore ankle dorsiflexion — classically performed as the open Strayer procedure.

Verified May 8, 2026 · 6 sources ↓

Medicare: $434.21
Total RVUs: 13
Global, days: 90
Region: Foot & ankle

Drawn from CMSAAPCGenhealth

Documentation requirements

What must appear in the operative or office note to support the claim.

Source · Editorial brief grounded in 6 cited references ↓

Specify the procedure by name (e.g., Strayer procedure, open gastrocnemius recession) — 'calf tendon revision' alone is insufficient for audit defense.
Document failed conservative treatment: stretching programs, orthotics, physical therapy, injection history, and duration of symptoms.
Operative note must identify the level of aponeurotic release (proximal vs. distal), plane of dissection between gastrocnemius and soleus, and intraoperative dorsiflexion measurement confirming correction.
Laterality must appear in both the operative note and the claim; Medicare rejects 27687 without LT or RT modifier per CMS Article A56869.
Diagnosis code must reflect equinus contracture or the specific downstream condition (plantar fasciitis, Achilles tendinopathy) driving the indication — mismatched ICD-10 is the top denial trigger.
If modifier 22 is appended, include a separate operative report addendum quantifying increased complexity and time.

Applicable modifiers

Modifiers commonly billed with this code.

Source · AMA CPT modifier descriptors · CMS NCCI Policy Manual

22 Increased complexity 24 Unrelated E/M during global 50 Bilateral procedure 51 Multiple procedures 58 Staged or related 59 Distinct service LT Left side RT Right side 76 Repeat, same physician 78 Unplanned return — related 79 Unrelated during global 80 Assistant surgeon

What this code covers

Source · Editorial summary grounded in 6 cited references ↓

CPT 27687 covers open gastrocnemius recession, most commonly the Strayer procedure, in which the surgeon incises the gastrocnemius aponeurosis in the proximal calf to lengthen the muscle-tendon unit and correct equinus deformity. The procedure addresses a tight gastrocnemius that limits ankle dorsiflexion and drives downstream pathology: chronic plantar fasciitis, Achilles tendinopathy, metatarsalgia, and foot deformities. Performed under regional or general anesthesia in a hospital outpatient department or ASC, it typically takes one to two hours. Both orthopedic surgeons and podiatric surgeons bill this code, subject to state scope-of-practice rules for podiatrists treating gastrocnemius equinus.

Do not use 27687 for endoscopic gastrocnemius recession (EGR). The open code does not map to a minimally invasive approach. EGR has no dedicated CPT code and must be reported as 29999 (unlisted arthroscopy/endoscopy). CPT Assistant November 2008 confirmed 29999 is the correct vehicle for EGR despite its 'arthroscopy' label. Submitting 27687 for an endoscopic approach invites an audit flag and potential recoupment.

The 90-day global period covers the day-before visit, the operative session, and all routine post-op care through day 90. Physical therapy referrals, casting changes, and wound checks are bundled. Unrelated E/M services within the global window require modifier 24. A staged contralateral procedure — or any unrelated surgery during the global period — requires modifier 79. If the same-session operative plan escalated significantly in complexity (extensive scarring, neurovascular dissection), document the additional work thoroughly and append modifier 22 with a supporting letter.

RVU & reimbursement

Component RVUs and Medicare national rate. Actual payment varies by GPCI locality.

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU	6.25
Practice expense RVU	5.77
Malpractice RVU	0.98
Total RVU	13
Medicare national rate	$434.21
Global period	90 days

Payment by site of service

Medicare pays different rates by setting. HOPD typically pays substantially more than ASC for the same procedure.

Source · CMS OPPS Addendum B·ASC HCPCS payment rates·2026

Setting	Medicare rate (national)
Office (PFS non-facility) Procedure performed in physician's office	$434.21
HOPD (APC 5113) Hospital outpatient department	$3,342.87
ASC (PI A2) Ambulatory surgical center (freestanding)	$1,644.87

Common denial reasons

The recurring reasons claims for CPT 27687 get rejected.

Source · Editorial brief grounded in CMS NCCI edits, AAOS coding appeals, and cited references ↓

Missing laterality modifier (LT or RT) — Medicare rejects the claim line outright without it.
ICD-10 diagnosis does not support medical necessity; payers such as Humana apply plantar fasciitis treatment policies that require documented conservative therapy failure before approving surgical intervention.
Procedure billed as 27687 when the operative report describes an endoscopic approach — correct code is 29999; miscoding creates both a denial and an audit exposure.
Claim submitted during the global period of a prior related procedure without the appropriate modifier (58 for staged/related, 78 for unplanned return to OR for related complication, 79 for unrelated surgery).
Modifier 22 appended without a supporting operative addendum explaining the increased complexity, causing automatic denial or reduced payment to the base rate.

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 6 cited references ↓

01Can 27687 be billed for an endoscopic gastrocnemius recession?

No. 27687 describes only the open procedure. Endoscopic gastrocnemius recession (EGR) has no dedicated CPT code. Report it as 29999 (unlisted arthroscopy/endoscopy) with a cover letter and comparable code crosswalk. CPT Assistant November 2008 confirmed this is the correct approach despite the 'arthroscopy' label in 29999's descriptor.

02Is a laterality modifier required on every claim for 27687?

Yes. CMS Article A56869 (effective 01/01/2025) requires LT or RT on all 27687 claim lines. Claims submitted without laterality are rejected — not just denied — meaning they don't enter the adjudication queue at all. Append LT or RT at the time of charge entry.

03What modifier applies if the surgeon performs bilateral gastrocnemius recessions in the same operative session?

Append modifier 50 to 27687. Bill on a single line with modifier 50, or per payer preference on two lines with LT and RT. Confirm the specific billing format with each payer — Medicare and many commercial payers handle bilateral reporting differently.

04What is the global period for 27687, and what is bundled into it?

27687 carries a 90-day global period. The pre-operative visit on the day before surgery, the procedure itself, and all routine post-op care through day 90 are bundled — including wound checks, dressing changes, and routine follow-up. Use modifier 24 for unrelated E/M visits during the global window, and modifier 79 for unrelated surgeries.

05Can a podiatrist bill 27687?

Yes, podiatrists are among the top billing specialties for this code alongside orthopedic surgeons. However, scope-of-practice rules for podiatrists performing gastrocnemius equinus procedures vary by state. Confirm your state's podiatric scope before billing to avoid payer-level denials tied to provider specialty.

06When is modifier 58 appropriate for 27687 versus modifier 78?

Use modifier 58 when the recession was planned as a staged procedure following prior surgery — for example, performing gastrocnemius recession after an initial Achilles repair as a deliberate second stage. Use modifier 78 only for an unplanned return to the OR for a complication related to the original procedure. Never invert these — modifier 78 applied to a planned staged case will trigger a global period payment reduction and audit scrutiny.

Sources & references

Editorial content was developed using the following public sources. Last verified May 8, 2026.

Mira AI Scribe

Mira's AI scribe captures the procedure name (Strayer/open gastrocnemius recession), the operative approach, intraoperative dorsiflexion measurement, level of aponeurotic release, laterality, and the specific indication driving surgery. That detail locks in the correct code (27687 vs. 29999 for endoscopic), satisfies payer medical necessity criteria, and prevents the laterality-missing rejection that is the single most common clean-claim failure for this code.

See how Mira captures CPT 27687 documentation