Surgical · Other

Surgical reshaping of the forehead skeleton through contouring alone, without prosthetic augmentation or frontal sinus setback.

Verified May 8, 2026 · 7 sources ↓

Medicare: $685.05
Work RVU: 9.98
Global, days: 90
Region: Other

Drawn from CMSBedrockbillingCgsmedicareAAPCFindacode

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 name the surgical approach (e.g., bicoronal flap, direct hairline incision) — 'standard approach' flags audits.
Specify the exact bony structures contoured and the extent of bone removal; a generic description is insufficient.
Confirm no prosthetic material, bone graft, or frontal sinus wall osteotomy was performed — these distinguish 21137 from 21138 and 21139.
Include the clinical indication with supporting diagnosis: trauma sequelae, congenital craniofacial deformity, or post-oncologic defect for reconstructive coverage.
Anesthesia type and total operative time documented to support medical necessity and potential modifier 22 claims.
Pre-operative imaging (CT of facial bones) should be referenced if available, especially for reconstructive cases.

Applicable modifiers

Modifiers commonly billed with this code.

Source · AMA CPT modifier descriptors · CMS NCCI Policy Manual

22 Increased complexity 51 Multiple procedures 76 Repeat, same physician 77 Repeat, another physician 78 Unplanned return — related 79 Unrelated during global 80 Assistant surgeon AS PA/NP/CNS assistant

What this code covers

Source · Editorial summary grounded in 7 cited references ↓

CPT 21137 covers forehead reduction by osseous contouring only — the surgeon accesses the frontal bone via a bicoronal or hairline incision, removes and reshapes the bony prominence, and closes without placing prosthetic material or performing a frontal sinus wall setback. That last distinction matters: if the anterior frontal sinus wall is repositioned, the correct code is 21139; if prosthetic material or bone graft is added, use 21138. Billing 21137 when the operative note documents a sinus wall osteotomy is a miscode that auditors catch quickly.

The 90-day global period applies. All routine post-op visits, wound checks, and suture removal through day 90 are bundled. Anything outside routine post-op management — a new, unrelated problem or an unplanned return to the OR for a related complication — requires modifier 24, 25, 78, or 79 as appropriate. Document the precise approach (bicoronal flap, direct hairline incision) and the specific bony structures contoured; vague operative language like 'forehead was contoured as planned' is an audit red flag.

Coverage is heavily payer-dependent. Most commercial plans and Medicare treat 21137 as cosmetic when the indication is aesthetic, requiring medical necessity documentation for reconstructive cases (trauma sequelae, congenital deformity, post-oncologic reconstruction). A diagnosis code that clearly reflects the underlying pathology — not merely a cosmetic complaint — is the front line of denial prevention. Verify individual payer policies before scheduling.

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 (9.98) is the surgeon's own effort — the figure physician pay and productivity targets are built on. The total RVU (20.51) adds practice overhead and malpractice, and is what drives the Medicare payment below.

Work RVU	9.98
Practice expense RVU	8.68
Malpractice RVU	1.85
Total RVU	20.51
Medicare national rate	$685.05
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	$685.05
HOPD (APC 5164) Hospital outpatient department	$3,387.27
ASC (PI G2) Ambulatory surgical center (freestanding)	$1,480.50

Common denial reasons

The recurring reasons claims for CPT 21137 get rejected.

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

Cosmetic exclusion applied when the diagnosis code reflects aesthetic concern rather than a documented reconstructive indication.
Code mismatch: billing 21137 when the operative note describes frontal sinus wall repositioning (21139) or prosthetic placement (21138).
Missing or inadequate medical necessity documentation for commercial and Medicare payers requiring prior authorization for craniofacial reconstruction.
Global period conflicts: post-op E/M visits billed without modifier 24 when they fall within the 90-day window.
Lack of pre-authorization — many payers require it for any cranial bone reconstruction regardless of reconstructive intent.

Frequently asked questions

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

01What separates 21137 from 21138 and 21139?

21137 is contouring only. Use 21138 when prosthetic material or a bone graft is placed during the same session. Use 21139 when the anterior frontal sinus wall is set back via osteotomy. The operative note must explicitly confirm which was — and was not — done.

02Is 21137 covered by Medicare for cosmetic forehead reduction?

No. Medicare excludes cosmetic procedures. Coverage requires a documented reconstructive indication — congenital craniofacial deformity, post-traumatic skeletal deformity, or post-oncologic reconstruction. Pair the code with a diagnosis that reflects the underlying pathology, not the aesthetic complaint.

03Can 21137 be billed same-day with other craniofacial procedures?

Yes, with modifier 51 appended to the lower-valued code when multiple distinct procedures are performed in the same session. Verify NCCI edits for any specific code pairs using the CMS NCCI PTP lookup tool before billing.

04What global period applies, and what does it cover?

21137 carries a 90-day global. Routine post-op visits, dressing changes, and suture removal are bundled through day 90. Unrelated E/M services need modifier 24; unrelated procedures need modifier 79; an unplanned return to the OR for a related complication needs modifier 78.

05When is modifier 22 appropriate for 21137?

Append modifier 22 when the work was substantially greater than typical — for example, revision of a prior craniofacial surgery with significant scar tissue or complex anatomy. Document the added time and complexity explicitly in the operative note; a modifier 22 without supporting narrative will be denied or recouped.

06Does site of service affect reimbursement for 21137?

Yes. HOPD and ASC payments differ materially — see the site-of-service comparison table on this page. The facility fee split means the surgeon's professional fee is the same regardless of setting, but total case economics differ. Most commercial payers also have separate facility allowables.

Sources & references

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

Mira Scribe

Mira's AI scribe captures the surgical approach by name, the specific forehead and brow structures contoured, confirmation that no prosthetic or bone graft material was placed, and whether the frontal sinus wall was left intact. That detail set directly prevents the two most common miscodes — upcoding to 21138 or 21139 — and gives the coder everything needed to defend a reconstructive diagnosis against a cosmetic exclusion denial.

See how Mira captures CPT 21137 documentation