Open incisional biopsy of the synovial lining of a foot joint, typically the metatarsophalangeal joint, for tissue diagnosis.

Verified May 8, 2026 · 5 sources ↓

Medicare: $381.10
Work RVU: 3.96
Global, days: 90
Region: Foot & ankle

Drawn from CMSAAPCCgsmedicareMdclarity

Documentation requirements

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

Source · Editorial brief grounded in 5 cited references ↓

Specify which foot joint was biopsied (e.g., first MTP, second MTP) — 'foot joint' alone is insufficient for audit defense.
Operative note must name the surgical approach and confirm the joint capsule was opened to access the synovium.
Document the indication: clinical signs driving the biopsy (e.g., erosive arthropathy, suspected synovial chondromatosis, inflammatory arthritis workup).
Record specimen laterality (right vs. left foot) and confirm pathology was submitted — absence of a pathology order is a red flag on audit.
If billing bilateral (modifier 50), operative note must explicitly document both joints were biopsied in the same session.
For same-day procedures, document medical necessity for each service separately to support modifier 59 or XS if NCCI edits apply.

Applicable modifiers

Modifiers commonly billed with this code.

Source · AMA CPT modifier descriptors · CMS NCCI Policy Manual

22 Increased complexity 50 Bilateral procedure 51 Multiple procedures 59 Distinct service 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 5 cited references ↓

CPT 28052 describes an open biopsy of the joint lining (synovium) of a foot joint. The surgeon makes an incision to access the joint — most commonly the metatarsophalangeal joint — and excises a tissue sample from the synovial membrane for pathologic analysis. This is a diagnostic procedure, not a therapeutic one; the goal is tissue, not joint debridement or repair.

The 90-day global period means all routine post-op care through day 90 is bundled into the payment. If a separate, unrelated procedure is needed during that window, append modifier 79. If the same foot joint requires a staged or related procedure within the global period, modifier 78 applies. Bilateral biopsies on both feet on the same day require modifier 50 (or LT/RT on separate line items per payer preference).

Verify NCCI edits before stacking 28052 with other foot joint codes on the same date of service. If a more comprehensive foot procedure is performed, 28052 may be bundled as a component — check the CGS NCCI PTP lookup before submitting. Modifier 59 or XS can override a modifier-indicator-1 edit only when the biopsy targets a genuinely distinct structure or separate anatomical site.

RVU & reimbursement

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

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU vs. total RVU

The work RVU (3.96) is the surgeon's own effort — the figure physician pay and productivity targets are built on. The total RVU (11.41) adds practice overhead and malpractice, and is what drives the Medicare payment below.

Work RVU	3.96
Practice expense RVU	7.1
Malpractice RVU	0.35
Total RVU	11.41
Medicare national rate	$381.10
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	$381.10
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 28052 get rejected.

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

NCCI bundling — 28052 denied as a component of a more comprehensive foot procedure billed on the same date without a valid modifier.
Laterality missing — claim lacks LT or RT modifier, triggering payer edit or manual review hold.
Medical necessity not established — no documented clinical indication linking the biopsy to a working diagnosis; payer rejects as unspecified or not covered.
Global period conflict — 28052 submitted during the post-op global window of a prior foot surgery without modifier 79 or 78.
Pathology not ordered or not documented — some payers require evidence the specimen was sent for analysis to support a diagnostic biopsy claim.

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 5 cited references ↓

01Does 28052 require a separate pathology code?

The biopsy collection is captured by 28052; pathologic examination of the specimen is billed separately by the pathologist under the appropriate surgical pathology code. Your practice bills 28052 for the surgical service; pathology bills independently for tissue analysis.

02Can 28052 be billed with an arthroscopic foot procedure on the same day?

Only if the biopsy was performed through an open incision as a distinct service from the arthroscopic work, and NCCI edits allow it with a modifier. Run the code pair through the CGS NCCI PTP lookup first. If the modifier indicator is 0, you cannot override the bundle.

03Which modifier do I use if both feet are biopsied in the same session?

Append modifier 50 for bilateral on a single line, or bill two lines with LT and RT. Confirm your payer's preference — Medicare accepts modifier 50 on one line; some commercial payers want separate line items.

04What is the global period for 28052, and what does it include?

28052 carries a 90-day global. The day of surgery, the immediate pre-op visit, and all routine post-op care through day 90 are bundled. Use modifier 24 for unrelated E/M visits and modifier 79 for unrelated surgical procedures within that window.

05Is 28052 appropriate for a synovial biopsy obtained during a joint aspiration?

No. 28052 requires an open incision to access the joint. A needle or trocar biopsy performed percutaneously would map to a different code. If the operative note documents open arthrotomy, 28052 is correct; if it describes a needle approach without surgical incision, it does not support this code.

06When is modifier 59 appropriate with 28052?

Use modifier 59 (or XS for separate structure) when 28052 is billed alongside another foot procedure and an NCCI edit with modifier indicator 1 applies. The operative note must document that the biopsy targeted a distinct anatomical site or was a clinically separate service — not just that both were done the same day.

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 name and laterality from dictation, confirms the surgical approach used to access the synovium, and flags the clinical indication driving the biopsy. It also notes whether pathology was submitted and whether any concurrent procedures were performed. That documentation chain prevents the two most common denials: NCCI bundling challenges and medical necessity rejections from vague operative notes.

See how Mira captures CPT 28052 documentation