Surgical reshaping of a benign facial bone tumor by contouring — most commonly performed for fibrous dysplasia — without enucleation or curettage.

Verified May 8, 2026 · 6 sources ↓

Medicare: $813.65
Work RVU: 8.18
Global, days: 90
Region: Other

Drawn from CMSAAPCNIHEmednyPayerprice

Documentation requirements

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

Source · Editorial brief grounded in 6 cited references ↓

Identify the specific facial bone(s) involved by anatomic name (e.g., zygoma, mandible, frontal bone, maxilla)
Describe the contouring technique used — burring, rasping, or reshaping — rather than a generic 'excision' or 'removal'
Establish the benign nature of the lesion, including pre-op imaging findings and/or pathology report confirming diagnosis (e.g., fibrous dysplasia)
Document why contouring was chosen over enucleation, curettage, or radical resection to support code selection over 21030 or 21026
Record the clinical indication and symptom burden (functional impairment, progressive deformity) to support medical necessity
Note whether the procedure was performed in an ASC or HOPD, as site of service affects reimbursement significantly

Applicable modifiers

Modifiers commonly billed with this code.

Source · AMA CPT modifier descriptors · CMS NCCI Policy Manual

22 Increased complexity 51 Multiple procedures 52 Reduced services 58 Staged or related 59 Distinct service 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 6 cited references ↓

CPT 21029 covers open surgical contouring of a benign tumor of the facial skeleton. The surgeon burrs, shaves, or otherwise reshapes the abnormal bone to restore contour rather than excising a discrete mass. Fibrous dysplasia is the canonical example, but the code applies to any benign facial bone lesion managed by contouring technique. It sits within the Excision Procedures on the Head subsection and carries a 90-day global period.

Distinguish 21029 from adjacent codes carefully. CPT 21030 covers enucleation and curettage of a benign tumor or cyst of the maxilla or zygoma — a different technique. CPT 21026 is excision of facial bone(s) for conditions such as osteomyelitis, not tumor contouring. Using the wrong code based on anatomy alone, without reflecting operative technique, is the most common coding error on these claims.

The 90-day global means all routine postoperative care is bundled. If a separate, unrelated procedure is performed during the global window, append modifier 79. If the patient returns to the OR for a complication related to the original contouring, use modifier 78. Document the specific facial bone(s) involved, the contouring technique used, and the pathologic basis for the procedure — payers and auditors will scrutinize whether the operative note supports benign tumor contouring versus a different excisional approach.

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 (8.18) is the surgeon's own effort — the figure physician pay and productivity targets are built on. The total RVU (24.36) adds practice overhead and malpractice, and is what drives the Medicare payment below.

Work RVU	8.18
Practice expense RVU	14.83
Malpractice RVU	1.35
Total RVU	24.36
Medicare national rate	$813.65
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	$813.65
HOPD (APC 5164) Hospital outpatient department	$3,387.27
ASC (PI A2) Ambulatory surgical center (freestanding)	$1,480.50

Common denial reasons

The recurring reasons claims for CPT 21029 get rejected.

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

Wrong code selected — payers deny 21029 when operative note describes enucleation or curettage rather than contouring, triggering a crosswalk to 21030
Insufficient medical necessity documentation — claims denied when the record lacks imaging, prior conservative management, or documented functional impact of the lesion
Pathology not supporting a benign tumor — if no pathology report or imaging is on file confirming a benign lesion, payers may deny as unsubstantiated
Global period conflict — a related procedure billed within the 90-day global without modifier 78 is automatically bundled and denied
Site-of-service mismatch — billing the professional component at HOPD rates when the procedure was performed at an ASC triggers adjustment or denial

Frequently asked questions

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

01What is the difference between CPT 21029 and CPT 21030?

21029 is contouring — the surgeon reshapes the bone in place. 21030 is enucleation and curettage of a benign tumor or cyst of the maxilla or zygoma — the lesion is scooped out. Technique drives the code selection, not anatomy alone.

02Can 21029 be billed for fibrous dysplasia of the skull or temporal bone?

The code specifies facial bone. Procedures on the temporal bone or occipital skull are outside the facial skeleton as defined in the CPT Head subsection. AAPC forum discussions flag this exact boundary issue — contouring of a postauricular skull exostosis, for example, may not map cleanly to 21029 and may require an unlisted code or a closer anatomic match.

03Does the 90-day global period apply to 21029?

Yes. The global period is 090 — all routine postoperative visits, dressing changes, and follow-up care through day 90 are bundled. Unrelated procedures in that window need modifier 79; a return to the OR for a related complication needs modifier 78.

04Is pathology required to bill 21029?

CMS does not mandate a pathology report as a universal billing prerequisite, but most payers expect documentation confirming the benign nature of the lesion — typically pre-op imaging (CT or MRI) plus intraoperative findings, and ideally a pathology report. Without it, expect medical necessity denials.

05How does site of service affect reimbursement for 21029?

There is a significant payment difference between the HOPD and ASC settings — see the Site of Service comparison table on this page. The professional fee also differs because of the facility versus non-facility RVU split. Confirm your contracted rates by site before scheduling.

06Can modifier 22 be appended to 21029 for an unusually complex case?

Yes, if the procedure was substantially more work than typical — for example, extensive craniofacial involvement or revision after prior surgery. The operative note must document the specific factors that increased complexity, and most payers require a cover letter with the claim. Expect pre-payment review.

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 specific facial bone contoured, the technique (burring, rasping, reshaping), and the confirmed benign diagnosis from the operative dictation — automatically flagging if the note says 'excision' or 'curettage' instead of 'contouring,' which would point to 21030 rather than 21029 and trigger a denial on audit.

See how Mira captures CPT 21029 documentation