Open surgical repair of 1–3 unilateral rib fractures with internal fixation hardware; thoracoscopic visualization is included when used but not required.

Verified May 8, 2026 · 6 sources ↓

Medicare: $544.77
Work RVU: 10.52
Global, days: 0
Region: Other

Drawn from CMSAAPCMdclarity

Documentation requirements

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

Source · Editorial brief grounded in 6 cited references ↓

Specify the exact number of ribs treated and confirm the count is 1–3 for 21811 (vs. 21812 or 21813)
Confirm laterality — 21811 is unilateral; document left or right side explicitly
Describe the internal fixation hardware used (plate, screw, nail, or wire) and the fixation technique — internal fixation is required by code descriptor
Document whether thoracoscopic visualization was performed; if so, note scope placement and visualization findings
Record the mechanism and nature of trauma establishing medical necessity for open fixation rather than conservative management
Operative note must distinguish open surgical approach from any closed or percutaneous technique

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 52 Reduced services 62 Co-surgeons 78 Unplanned return — related 79 Unrelated during global 80 Assistant surgeon AS PA/NP/CNS assistant LT Left side RT Right side

What this code covers

Source · Editorial summary grounded in 6 cited references ↓

CPT 21811 covers open treatment of one to three ribs on a single side with internal fixation — plates, screws, nails, or wires applied directly to stabilize the fracture. The code is unilateral by definition; internal fixation is required by the descriptor (no comma separating it from the procedure), while thoracoscopic visualization is optional and included when performed (the comma in the descriptor signals this). Do not use 21811 for four or more ribs — step up to 21812 (4–6 ribs) or 21813 (7 or more ribs).

The global period is 000, meaning no post-op work is bundled — routine follow-up E/M visits after the operative date bill normally. Intraoperative fluoroscopy and x-rays are integral to the surgical package and are not separately billable by the operating surgeon. The procedure is predominantly performed in an inpatient hospital setting; there is no established ASC payment rate.

Payer coverage for 21811 is actively variable. Several MACs historically excluded it on the grounds that 1–3 rib fractures rarely require fixation; Palmetto GBA revised its article in November 2024 to remove that exclusion language, but individual payer policies differ. Verify prior authorization requirements and check the applicable LCD before submitting — denials citing 'investigational' or 'not medically necessary' are the most common reason for non-payment on this code.

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 (10.52) is the surgeon's own effort — the figure physician pay and productivity targets are built on. The total RVU (16.31) adds practice overhead and malpractice, and is what drives the Medicare payment below.

Work RVU	10.52
Practice expense RVU	3.19
Malpractice RVU	2.6
Total RVU	16.31
Medicare national rate	$544.77
Global period	0 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	$544.77
HOPD (APC 5114) Hospital outpatient department	$7,413.38

Common denial reasons

The recurring reasons claims for CPT 21811 get rejected.

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

Payer deems fixation of 1–3 ribs not medically necessary or investigational — requires robust clinical justification in the record
Wrong code selected when rib count is 4 or more — should be 21812 or 21813
Missing or ambiguous laterality; claim rejected for lack of LT or RT modifier
Prior authorization not obtained — many commercial payers require auth for this procedure
Intraoperative imaging billed separately by the surgeon, triggering a bundling denial

Frequently asked questions

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

01Is thoracoscopic visualization required to bill 21811?

No. The comma in the descriptor signals it is optional — included in the code when performed, but the code is valid without it. Internal fixation, by contrast, has no comma and is required.

02What is the global period for 21811?

Zero days (000). Post-operative E/M visits after the day of surgery bill separately and do not require modifier 24. There is no bundled post-op period to track.

03Can 21811 be billed bilaterally if both sides are treated?

The code is unilateral by descriptor. For bilateral rib fixation, report 21811 twice — once with modifier LT and once with modifier RT — or use modifier 50 per your payer's bilateral reporting policy. Confirm with the payer before submitting.

04Which code applies when 4 or more ribs are fixed?

Use 21812 for 4–6 ribs and 21813 for 7 or more ribs, both unilateral. Using 21811 for a higher rib count will likely result in a down-coded payment or denial on audit.

05Why do some payers deny 21811 as investigational?

Several MACs previously had LCD language stating that 1–3 rib fractures rarely require internal fixation. Palmetto GBA removed that exclusion in November 2024, but other payers may retain similar policies. Check the applicable LCD and obtain prior authorization when required — robust clinical documentation of medical necessity is essential.

06Can intraoperative x-rays or fluoroscopy be billed separately by the surgeon?

No. Intraoperative imaging is integral to the surgical package for 21811 and is not separately reportable by the operating surgeon.

07Is 21811 performed in ASCs?

There is no established ASC payment rate for 21811 under the 2026 CMS fee schedule. The code is billed almost exclusively in inpatient or on-campus outpatient hospital settings.

Sources & references

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

Mira Scribe

Mira's AI scribe captures the rib count, laterality, fixation hardware type, surgical approach, and whether thoracoscopic visualization was performed — the four fields most likely to trigger a wrong-code or medical-necessity denial. It flags operative notes that omit explicit internal fixation documentation, since that element is required by the 21811 descriptor. When thoracoscopy is dictated, the scribe timestamps it as included-not-separately-billed, preventing inadvertent duplicate billing.

See how Mira captures CPT 21811 documentation