Surgical fusion of the tibiofibular joint, either at the proximal or distal articulation, to eliminate painful motion and restore stability.

Verified May 8, 2026 · 6 sources ↓

Medicare: $646.98
Total RVUs: 19.37
Global, days: 90
Region: Foot & ankle

Drawn from CMSAAPCNIHGenhealthAcgme

Documentation requirements

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

Source · Editorial brief grounded in 6 cited references ↓

Specify whether the fusion is proximal or distal tibiofibular joint — operative note must name the joint explicitly.
Document cartilage resection technique and preparation of bone surfaces to confirm true arthrodesis, not just fixation.
Record graft type (autograft, allograft, or synthetic) and harvest site if autograft was obtained.
Describe fixation construct: screw count, plate type, rod placement, or any combination, with anatomic location.
Include indication documenting failure of conservative treatment (physical therapy, bracing, injections) prior to surgery.
If billing 27871 alongside 27870 or 28725, document each joint fused in a separate paragraph of the operative note.

Applicable modifiers

Modifiers commonly billed with this code.

Source · AMA CPT modifier descriptors · CMS NCCI Policy Manual

22 Increased complexity 51 Multiple procedures 58 Staged or related 59 Distinct service 62 Co-surgeons 78 Unplanned return — related 79 Unrelated during global 80 Assistant surgeon LT Left side RT Right side XS Separate structure

What this code covers

Source · Editorial summary grounded in 6 cited references ↓

CPT 27871 describes open arthrodesis of the tibiofibular joint — proximal or distal. The surgeon exposes the joint, resects articular cartilage down to bleeding cancellous bone, may place autograft or allograft to fill the fusion bed, then fixes the tibia and fibula together using hardware (screws, plates, or rods) until osseous union occurs. The distal tibiofibular joint (syndesmosis) is the more common target; proximal tibiofibular joint fusion is performed for chronic instability or post-traumatic arthritis at that articulation.

Distinguish 27871 from 27870 (ankle arthrodesis) and from 27829 (open treatment of syndesmosis disruption with internal fixation). Syndesmosis disruption repair is a fracture-care code; 27871 is arthrodesis. Payers will scrutinize claims where 27870 and 27871 are billed together — document the distinct joints fused with separate operative descriptions if both are performed. When a tibiotalocalcaneal fusion is performed, 27871 may be addable to 28725 if the tibiofibular joint is explicitly fused as a separate component; coding forums and payer guidance vary, so confirm with individual payers.

The 90-day global covers all routine post-op visits, cast changes, hardware checks, and wound care through day 90. Unrelated E/M services in that window need modifier 24. A return to the OR for a related complication (e.g., hardware failure with revision fixation) uses modifier 78. An unrelated procedure in the global period uses modifier 79.

RVU & reimbursement

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

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU	9.3
Practice expense RVU	8.22
Malpractice RVU	1.85
Total RVU	19.37
Medicare national rate	$646.98
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	$646.98
HOPD (APC 5115) Hospital outpatient department	$13,116.76
ASC (PI J8) Ambulatory surgical center (freestanding)	$9,492.21

Common denial reasons

The recurring reasons claims for CPT 27871 get rejected.

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

Upcoding or unbundling flag when 27871 is billed same-day as 27870 without distinct documentation of each joint fused.
Medical necessity denial when conservative treatment failure is not documented in the pre-op note or H&P.
Missing laterality modifier (LT or RT) on claims requiring site identification by the payer.
Global period conflict when a post-op visit is billed without modifier 24 for an unrelated E/M during the 90-day window.
Incorrect code selection — 27829 (syndesmosis disruption repair) billed when an elective arthrodesis was performed, or vice versa.

Frequently asked questions

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

01What is the difference between CPT 27871 and CPT 27870?

27870 is ankle (tibiotalar) arthrodesis. 27871 is tibiofibular joint arthrodesis — a distinct articulation. If both joints are fused in the same session, both codes may be reported, but the operative note must separately describe each fusion. Expect payer scrutiny; some require modifier 59 or XS to confirm distinct procedures.

02Can 27871 and 27829 both be billed for a syndesmosis procedure?

No — they describe different clinical scenarios. 27829 is open treatment of an acute or subacute syndesmosis disruption (fracture care). 27871 is elective arthrodesis for chronic instability or arthritis. Bill the one that matches what was done and why; mixing them on the same encounter for the same joint is a misuse of one code.

03Is modifier 50 appropriate for 27871?

Bilateral tibiofibular joint fusion in a single session would justify modifier 50, but it is clinically rare. If you do bill it, document bilateral pathology and bilateral fixation explicitly. Some payers want two line items (LT and RT) instead of a single line with modifier 50 — confirm payer preference before submitting.

04What global period applies, and what does it cover?

27871 carries a 90-day global period under CMS Physician Fee Schedule 2026. That includes the surgery, the day-before pre-op visit, and all routine post-op care through day 90: office visits, wound checks, cast or boot changes, and hardware monitoring. Anything unrelated requires modifier 24 (E/M) or 79 (procedure).

05Can 27871 be billed with a bone graft code in the same session?

Autograft harvest from a separate site (e.g., iliac crest) may be separately reportable depending on NCCI edits and payer rules — check current NCCI tables before billing. Allograft application is generally included in the arthrodesis code and not separately billable. Document graft type either way to support the record.

06Does site of service affect payment for 27871?

Yes. The HOPD and ASC payment rates differ materially — see the Site of Service comparison on this page. The physician professional fee is subject to the facility vs. non-facility RVU distinction; work with your facility on the most appropriate setting given patient acuity and payer mix.

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 joint level (proximal vs. distal tibiofibular), cartilage resection technique, graft material and source, fixation construct with hardware details, and the surgeon's documented rationale linking failed conservative care to the arthrodesis decision. That operative specificity blocks the two most common denial triggers: a missing joint-level designation that auditors flag as ambiguous between 27871 and 27870, and a medical necessity denial tied to absent conservative-treatment failure documentation.

See how Mira captures CPT 27871 documentation