Arthroscopy · Knee

Arthroscopically assisted treatment of a bicondylar tibial plateau fracture (both medial and lateral condyles), with or without internal fixation.

Verified May 8, 2026 · 5 sources ↓

Medicare: $917.86
Total RVUs: 27.48
Global, days: 90
Region: Knee

Drawn from CMSAAPCFindacode

Documentation requirements

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

Source · Editorial brief grounded in 5 cited references ↓

Specify fracture pattern by condyle involvement — confirm bicondylar (both medial and lateral) to distinguish from 29855 (unicondylar)
Document arthroscopic visualization of articular reduction, including joint compartments examined
Identify fixation method used: screws, K-wires, plate, or no hardware (code includes 'with or without internal fixation')
Record that the procedure was completed arthroscopically — if converted to open, the op note must reflect that and open code replaces 29856
Note associated injuries addressed in the same session (meniscal tears, ligament damage) to support additional codes billed with modifier 59 or XS
Surgeon dictation must name the approach and confirm fracture pattern matches preoperative imaging

Applicable modifiers

Modifiers commonly billed with this code.

Source · AMA CPT modifier descriptors · CMS NCCI Policy Manual

22 Increased complexity 51 Multiple procedures 59 Distinct service LT Left side RT Right side 78 Unplanned return — related 79 Unrelated during global 80 Assistant surgeon AS PA/NP/CNS assistant XS Separate structure

What this code covers

Source · Editorial summary grounded in 5 cited references ↓

CPT 29856 covers arthroscopically aided repair of a tibial plateau fracture involving both condyles — the bicondylar (Schatzker V or VI) pattern. The surgeon uses an arthroscope to visualize the fracture reduction and may apply internal fixation devices such as screws, plates, or K-wires through separate percutaneous incisions. The arthroscope provides direct visualization of articular surface congruity without requiring a full open arthrotomy.

This code sits in a family with 29855 (unicondylar tibial plateau fracture) and the open equivalents 27535–27536. If the procedure begins arthroscopically but requires conversion to an open approach, only the open code (27536 for bicondylar) is reported — not 29856 plus the open code. Fluoroscopy used during the procedure is integral and cannot be billed separately per NCCI policy.

The 90-day global period covers the operative day, the day-before pre-op visit, and all routine follow-up through day 90. Separate billing for related post-op care during that window requires modifier 24 (E/M) or 79 (unrelated procedure). If a complication requires a return to the OR for a related procedure, use modifier 78.

RVU & reimbursement

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

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU	13.92
Practice expense RVU	10.59
Malpractice RVU	2.97
Total RVU	27.48
Medicare national rate	$917.86
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	$917.86
HOPD (APC 5115) Hospital outpatient department	$13,116.76
ASC (PI J8) Ambulatory surgical center (freestanding)	$10,268.18

Common denial reasons

The recurring reasons claims for CPT 29856 get rejected.

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

Upcoding from 29855 (unicondylar) — payer audits flags when imaging shows single-condyle involvement but 29856 is billed
Unbundling fluoroscopy (77002) separately — fluoroscopy is integral to arthroscopic fracture fixation and is not separately payable
Billing 29856 and the open equivalent (27536) together — conversion to open procedure allows only the open code
Missing fixation documentation when payer expects hardware use to justify the higher-complexity code
Diagnostic arthroscopy (29870) billed alongside 29856 — surgical arthroscopy always includes the diagnostic component

Frequently asked questions

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

01What is the difference between 29855 and 29856?

29855 is for a unicondylar tibial plateau fracture (one condyle — medial or lateral). 29856 is for a bicondylar pattern involving both condyles. Operative imaging and the intraoperative arthroscopic findings must confirm the bicondylar pattern to bill 29856.

02Can I bill 29856 and 27536 together if I started arthroscopically but had to open?

No. NCCI policy is explicit: if an arthroscopic procedure is converted to open, report only the open code (27536 for bicondylar tibial plateau). Billing both is considered unbundling.

03Is fluoroscopy separately billable during 29856?

No. Per NCCI Chapter 4, fluoroscopy performed during any arthroscopic procedure is integral to the primary code and cannot be reported separately.

04Can I separately bill a meniscal repair (e.g., 29882) performed at the same time as 29856?

Yes, with modifier 59 or XS to indicate a distinct procedural service. Document the separate intra-articular pathology and its treatment clearly in the operative note to survive NCCI scrutiny.

05How does the 90-day global period affect billing for this procedure?

All routine post-op care through day 90 is bundled. A related unplanned return to the OR (e.g., for hardware failure) uses modifier 78. An unrelated procedure in the global window uses modifier 79. E/M visits for unrelated conditions need modifier 24.

06Does 29856 require internal fixation to be billed, or is visualization alone sufficient?

The code covers arthroscopically aided treatment with or without internal fixation. Hardware is not required. However, documentation must clearly reflect the surgical treatment performed, not just diagnostic visualization — which would be 29870 if no treatment was rendered.

Sources & references

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

Mira AI Scribe

Mira's AI scribe captures condyle involvement (medial, lateral, or both), fixation type and hardware used, arthroscopic visualization details, and any concomitant intra-articular pathology addressed in the same session. That specificity prevents 29855-vs-29856 downcoding disputes and supports separate billing for meniscal or ligament procedures with the correct modifier.

See how Mira captures CPT 29856 documentation