Open surgical treatment of a bicondylar proximal tibial plateau fracture, with or without internal fixation.

Verified May 8, 2026 · 7 sources ↓

Medicare: $1,090.87
Total RVUs: 32.66
Global, days: 90
Region: Knee

Drawn from CMSAAPCEmednyAbosAoassn

Documentation requirements

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

Source · Editorial brief grounded in 7 cited references ↓

Operative note must specify bicondylar involvement — both medial and lateral condyles — not just a single condyle or intercondylar structure.
Document the surgical approach by name (e.g., dual incision, anterolateral, posteromedial) — audit teams flag notes that say only 'standard approach'.
If internal fixation is used, identify the hardware type (locking plate, cannulated screws, buttress plate) and placement.
Imaging correlation: preoperative CT or X-ray confirming bicondylar fracture pattern should be referenced in the operative note.
Document any concomitant ligamentous, meniscal, or vascular injuries and whether they were addressed — these affect additional coding.
If staged procedure, document the rationale (e.g., initial spanning external fixation, soft tissue swelling) to support modifier 58 on the definitive fixation claim.

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 76 Repeat, same physician 77 Repeat, another physician 78 Unplanned return — related 79 Unrelated during global 80 Assistant surgeon LT Left side RT Right side

What this code covers

Source · Editorial summary grounded in 7 cited references ↓

CPT 27536 covers open treatment of a proximal tibial plateau fracture involving both condyles (bicondylar). This is the highest-complexity tier of tibial plateau fracture repair — one step above the unicondylar open repair (27535) and the closed/manipulative approaches. The surgeon opens the knee, reduces the fracture, and may apply plates, screws, or other internal fixation hardware to restore articular congruity. Internal fixation is optional per the code descriptor, but virtually all bicondylar patterns require it given the instability involved.

The 90-day global period covers the operative date, the day-before pre-op visit, and all routine post-op management through day 90. Anything unrelated to the fracture billed in that window needs modifier 24 (E/M) or 79 (unrelated procedure). A planned staged procedure — such as a second-stage definitive fixation after temporary spanning external fixation — bills with modifier 58. An unplanned return to the OR for a related complication uses modifier 78.

Do not confuse 27536 with 29856, which applies when the approach is entirely arthroscopically aided with no open incision for a bicondylar plateau fracture. If any open incision is made, 27536 is the correct code. Laterality modifiers LT and RT are expected on all single-side claims.

RVU & reimbursement

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

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU	16.96
Practice expense RVU	12.1
Malpractice RVU	3.6
Total RVU	32.66
Medicare national rate	$1,090.87
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	$1,090.87
HOPD (APC 5114) Hospital outpatient department	$7,413.38
ASC (PI J8) Ambulatory surgical center (freestanding)	$5,042.29

Common denial reasons

The recurring reasons claims for CPT 27536 get rejected.

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

Upcoding from 27535 (unicondylar) to 27536 (bicondylar) without CT or operative documentation confirming both condyles involved.
Laterality modifier missing — payers increasingly require LT or RT on unilateral knee fracture procedures.
Arthroscopically-aided approach documented in the operative note triggers a payer review for 29856 instead of 27536.
Global period violations — post-op E/M visits billed without modifier 24 during the 90-day window.
Modifier 78 and 79 inverted — applying 79 (unrelated) to a return for fracture-related complication instead of 78 (related).

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 7 cited references ↓

01What's the difference between 27535 and 27536?

27535 is open treatment of a unicondylar proximal tibial plateau fracture — one condyle involved. 27536 is the bicondylar version — both condyles. The distinction must be supported by preoperative imaging and confirmed in the operative note. Billing 27536 when only one condyle is documented is a common audit target.

02Can 27536 be billed if the surgeon used an arthroscope during the case?

Only if an open incision was also made. If the entire reduction was accomplished arthroscopically with no open incision, 29856 is the correct code for bicondylar plateau fractures. Hybrid cases with both arthroscopic visualization and open fixation incisions may support 27536, but document the open component explicitly.

03How do you bill a staged tibial plateau fixation — temporary external fixation followed by definitive ORIF?

The temporary spanning external fixation bills separately at the time of that procedure. When the definitive open reduction is performed in the post-op period of the external fixation code, append modifier 58 to 27536 to indicate a staged, related procedure by the same surgeon. Do not use modifier 79 — that is for unrelated procedures.

04Is modifier 50 appropriate for bilateral tibial plateau fractures?

Bilateral tibial plateau fractures are rare but modifier 50 applies when both sides are treated open in the same operative session. Bill one line with modifier 50. Reimbursement typically does not exceed 150% of the single-procedure fee schedule amount under most payer contracts.

05What modifier applies if a different surgeon performs the definitive fixation after the initial surgeon placed a spanning frame?

The second surgeon bills 27536 without a transfer-of-care modifier if they are taking over the entire global period. If surgical care only is being provided (another surgeon handles pre- and post-op), modifier 54 applies. Confirm split-care arrangements are documented and that both surgeons do not bill the full global.

06Does 27536 include bone grafting performed at the same session?

Autograft or allograft used to fill a metaphyseal defect during tibial plateau ORIF is generally considered integral to the procedure and not separately billable. Check AAOS Complete Global Service Data and NCCI edits before appending a separate bone graft code — most payers bundle it.

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 fracture pattern (bicondylar vs. unicondylar), surgical approach by name, hardware type and placement, and any associated soft tissue findings from the surgeon's dictation. This prevents the most common audit flag — an operative note that confirms only a single condyle injury billed under the bicondylar code — and ensures laterality is documented at the point of dictation rather than reconstructed at billing.

See how Mira captures CPT 27536 documentation