Open surgical treatment of 4 to 6 rib fractures with internal fixation, including thoracoscopic visualization when performed, unilateral.

Verified May 8, 2026 · 7 sources ↓

Medicare: $655.33
Work RVU: 12.68
Global, days: 0
Region: Other

Drawn from CMSAAPCEmednyFindacodeCgsmedicare

Documentation requirements

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

Source · Editorial brief grounded in 7 cited references ↓

Exact count of ribs treated with internal fixation (must be 4, 5, or 6 to support this code over 21811 or 21813)
Laterality documented — this code is unilateral; bilateral procedures require modifier 50
Operative note describing the open approach and type of internal fixation hardware used
Documentation of thoracoscopic visualization if performed, confirming it was integral and not a separate diagnostic scope
Mechanism and nature of trauma correlating to ICD-10 fracture diagnosis codes
Pre- and post-op imaging referenced in the note to establish fracture pattern and fixation result

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 57 Decision for surgery 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 AS PA/NP/CNS assistant LT Left side RT Right side

What this code covers

Source · Editorial summary grounded in 7 cited references ↓

CPT 21812 covers open treatment of 4 to 6 rib fractures on one side with internal fixation. The surgeon accesses the fractured ribs through an open approach and stabilizes them with fixation hardware; thoracoscopic visualization is included when used and not separately reportable. This code sits in the middle of a three-code family: 21811 covers 1–3 ribs, 21812 covers 4–6, and 21813 covers 7 or more. Bill the code that matches the exact rib count documented — undercounting or overcounting triggers downcoding or upcoding flags.

The global period is 000, meaning no postoperative care is bundled. Same-day E&M is payable only if the decision to operate was made at that encounter (modifier 57) or the E&M is significant and separately identifiable (modifier 25). Radiologic guidance integral to the procedure is not separately reportable per NCCI policy. If both sides require surgery at the same session, modifier 50 applies and you bill one line.

This code is performed almost exclusively by thoracic surgeons. HOPD is the predominant setting — there is no established ASC payment rate. Documentation of exact rib count is the single most auditable element; operative notes that describe 'multiple ribs' without specifying a number will not support 21812 over 21811.

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 (12.68) is the surgeon's own effort — the figure physician pay and productivity targets are built on. The total RVU (19.62) adds practice overhead and malpractice, and is what drives the Medicare payment below.

Work RVU	12.68
Practice expense RVU	3.87
Malpractice RVU	3.07
Total RVU	19.62
Medicare national rate	$655.33
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	$655.33
HOPD (APC 5114) Hospital outpatient department	$7,413.38

Common denial reasons

The recurring reasons claims for CPT 21812 get rejected.

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

Rib count not specified in the operative note, making it impossible to distinguish 21811 from 21812 or 21813
Thoracoscopy billed separately (e.g., a thoracoscopy code) when it is integral to and included in 21812
Radiologic guidance or fluoroscopy billed separately when it is bundled per NCCI policy
Laterality not documented when bilateral fixation is claimed with modifier 50
ICD-10 diagnosis code does not match the number or laterality of ribs described in the operative note

Frequently asked questions

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

01Can I bill thoracoscopy separately when I use it to visualize during rib fixation?

No. Thoracoscopic visualization is explicitly included in 21812. Billing a separate thoracoscopy code at the same encounter will be bundled under NCCI and denied.

02What if I fix ribs on both sides at the same operative session?

21812 is a unilateral code. Bill it once with modifier 50 for bilateral fixation at the same session. Some payers require two line items with LT and RT instead — verify payer preference before submitting.

03What is the global period for 21812, and can I bill a same-day E&M?

The global period is 000. A same-day E&M is payable if the visit represents the decision to perform surgery (modifier 57) or is a significant, separately identifiable service (modifier 25). An E&M solely related to deciding whether to proceed with the minor surgical procedure is not separately payable under global package rules.

04How do I choose between 21811, 21812, and 21813?

The only variable is the number of ribs treated with internal fixation: 1–3 ribs is 21811, 4–6 ribs is 21812, 7 or more ribs is 21813. Bill the code that matches the documented rib count — not the rib count fractured, but the count actually treated with fixation.

05Is there an ASC payment rate for 21812?

No ASC payment rate is established for 21812. The procedure is paid under HOPD/OPPS when performed in a facility setting. Confirm site-of-service eligibility before scheduling.

06Can the assistant surgeon be billed separately for 21812?

Yes, an assistant surgeon may be reported using modifier 80 or AS (for a physician assistant or NP acting as assistant). Document the medical necessity for an assistant in the operative note.

Sources & references

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

Mira Scribe

Mira's AI scribe captures rib count, laterality, fixation technique, and whether thoracoscopic visualization was used — pulling these directly from dictation into the operative note. That prevents the most common audit flag for this code family: an operative note that documents 'multiple rib fractures' without specifying the exact number, which collapses a defensible 21812 claim into an upcoding allegation.

See how Mira captures CPT 21812 documentation