Arthroscopic partial synovectomy of the ankle tibiotalar and fibulotalar joints, removing inflamed synovial tissue through a scope-assisted approach.

Verified May 8, 2026 · 6 sources ↓

Medicare: $433.54
Total RVUs: 12.98
Global, days: 90
Region: Foot & ankle

Drawn from CMSAAPCAbosJposna

Documentation requirements

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

Source · Editorial brief grounded in 6 cited references ↓

Specify joints entered: tibiotalar and/or fibulotalar — do not just write 'ankle joint'
Describe the synovial tissue excised: location, extent, and confirmation that resection was performed (not just visualization)
Document the clinical indication driving synovectomy — e.g., inflammatory synovitis, impingement, post-traumatic synovial hypertrophy — with supporting diagnosis
Note portal placement, instruments used, and any incidental findings to support medical necessity and distinguish from diagnostic-only arthroscopy
If additional procedures were performed at the same session (e.g., loose body removal, debridement), document each as a separately identified, distinct surgical step
Record that the procedure was surgical, not purely diagnostic — diagnostic arthroscopy alone is not separately billable when converted to or combined with a surgical procedure

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 59 Distinct service 76 Repeat, same physician 78 Unplanned return — related 79 Unrelated during global LT Left side RT Right side XS Separate structure

What this code covers

Source · Editorial summary grounded in 6 cited references ↓

29895 covers arthroscopic partial synovectomy of the ankle — specifically the tibiotalar and fibulotalar joints. The surgeon introduces an arthroscope and instruments through small portals, inspects the joint lining, and excises the portion of synovial tissue that is inflamed or hypertrophic. 'Partial' is load-bearing in this descriptor: if the operative note documents only debridement of cartilage or bone without synovial resection, you're in 29897 or 29898 territory, not 29895.

The 90-day global period applies. All routine post-op care, dressing changes, and follow-up visits within that window are bundled. Bill anything unrelated to the ankle synovectomy during the global period with modifier 24 (E/M) or 79 (unrelated procedure). An unplanned return to the OR for a related complication takes modifier 78.

NCCI rules for ankle arthroscopy differ from CPT guidelines in one critical way: for Medicare, debridement (29897 or 29898) cannot be reported separately when performed at the same ankle encounter as another arthroscopic procedure. That NCCI restriction does not apply to 29895 the same way it applies to debridement codes, but you still cannot stack 29895 with 29897 or 29898 on the same ankle without scrutiny. If a more definitive procedure like loose body removal (29894) or osteochondral defect excision (29891) was also performed, review current NCCI PTP edits before appending modifier 59 or XS.

RVU & reimbursement

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

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU	6.95
Practice expense RVU	5.04
Malpractice RVU	0.99
Total RVU	12.98
Medicare national rate	$433.54
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	$433.54
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 29895 get rejected.

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

Operative note documents only debridement or chondroplasty without explicit synovial resection, mismatching 29895 descriptor
29897 or 29898 billed on the same ankle encounter without recognizing NCCI bundling restrictions for Medicare — debridement is not separately reportable with another ankle arthroscopy code under Medicare
Missing supporting diagnosis — payers deny when the ICD-10 code reflects only ankle pain without a documented structural or inflammatory etiology justifying synovectomy
Bilateral ankle synovectomy billed without modifier 50 or separate LT/RT modifiers, triggering MUE or duplicate-claim edits
Global period violation — post-op E/M visits billed without modifier 24, or related procedures returned to OR without modifier 78

Frequently asked questions

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

01Can 29895 and 29897 be billed together for the same ankle on the same date?

Not for Medicare. NCCI policy prohibits reporting arthroscopic debridement (29897 or 29898) separately when another arthroscopic procedure is performed on the same ankle at the same encounter. CPT guidelines don't carry the same blanket restriction, so commercial payer rules vary — check the individual plan's NCCI adoption policy before appending modifier 59.

02What's the difference between 29895 and 29898 when the surgeon removes inflamed tissue?

29895 requires synovial tissue resection — the surgeon physically excises the hypertrophic or inflamed synovium. 29897 and 29898 describe debridement of articular cartilage or bone surfaces. If the note documents both, review whether each procedure was distinct enough to support separate coding under applicable payer rules.

03Does 29895 cover subtalar joint synovectomy?

No. 29895 is specific to the tibiotalar and fibulotalar joints. Subtalar joint synovectomy is reported with 29905. If both joints are addressed arthroscopically in the same session, document each joint entry separately and review NCCI edits for the combination.

04How should a bilateral ankle synovectomy be billed?

Report 29895 with modifier 50 for a bilateral procedure billed on one line, or use 29895-LT and 29895-RT on separate lines depending on payer preference. Some payers require the two-line format. Confirm with the specific plan before submission.

05If the arthroscopy was planned as surgical but only diagnostic findings resulted, can 29895 still be reported?

No. 29895 requires that synovectomy was actually performed. A 'look and see' without synovial resection does not support a surgical arthroscopy code. NCCI policy is explicit: diagnostic arthroscopy cannot be reported separately when converted to or combined with a surgical procedure, and a surgical code cannot be claimed when only diagnostic arthroscopy was performed.

06What modifier applies if the surgeon returns to the OR within the 90-day global for ankle wound dehiscence related to the original surgery?

Use modifier 78 — unplanned return to the operating room for a procedure related to the initial surgery during the global period. Modifier 79 is for unrelated procedures. Inverting these is a common audit finding.

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 joints entered (tibiotalar, fibulotalar), the location and extent of synovial resection, portal placement, and the clinical rationale from dictation — producing operative note language that matches the 29895 descriptor word for word. This prevents the most common audit flag: notes that describe only visualization or debridement while billing for synovectomy.

See how Mira captures CPT 29895 documentation