Surgical · Other

Surgical augmentation of one or more facial bones using an autograft, allograft, or prosthetic implant to build up deficient bony contours.

Verified May 8, 2026 · 6 sources ↓

Medicare: $1,657.02
Total RVUs: 49.61
Global, days: 90
Region: Other

Drawn from NIHPlasticsurgeryEmednyAaomsAAPC

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) augmented by anatomic name (e.g., nasal dorsum, orbital rim, malar eminence, mandible).
Specify the graft or implant type used: autograft (with donor site noted), allograft (cadaveric material identified), or prosthetic implant (brand/material identified).
Document the indication — congenital deficiency, post-traumatic deformity, or acquired defect — with supporting diagnosis codes linked to the procedure.
Operative note must describe the surgical approach, exposure of the recipient bone, graft or implant placement, and fixation method; generic 'standard approach' language triggers audit flags.
If autograft is harvested at the same session, document the harvest site and confirm whether a separate harvest code is or is not being billed.
Record pre-authorization number if required by the payer — absence of this in the claim record is a leading cause of denial for this code.

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 AS PA/NP/CNS assistant LT Left side RT Right side XS Separate structure

What this code covers

Source · Editorial summary grounded in 6 cited references ↓

CPT 21208 covers osteoplasty of the facial bones performed for augmentation — meaning the surgeon is adding volume or structure to deficient facial bone, not removing it. Graft material options include autogenous bone harvested from the patient, cadaveric allograft (including rib-cartilage grafts used for nasal dorsum augmentation), or prosthetic implants such as Medpor or silicone. The code is used across a range of anatomic sites including the nasal bones, orbital rim, midface, and mandible, provided the primary intent is augmentation of the underlying bony skeleton.

This code carries a 90-day global period, so all routine post-op management through day 90 is bundled. Any visit in that window addressing an unrelated problem needs modifier 24; a separate E/M on the day of surgery for a distinct problem needs modifier 25. The code is a high-RVU procedure predominantly billed by oral surgeons and maxillofacial surgeons, and it appears on prior authorization lists for major payers including New York Medicaid. Per ASPS guidance, 21208 is frequently denied by commercial payers, making pre-authorization and tight diagnosis-code alignment non-negotiable before scheduling.

When augmenting the nasal dorsum with allograft or prosthetic implant, 21208 is the correct vehicle — not rhinoplasty codes. If autogenous rib cartilage is harvested for the augmentation, the harvest is generally included in 21208 and should not be separately coded. Confirm NCCI PTP edits for any concurrent craniofacial procedure billed same-day, as bundling disputes are common in this anatomic region.

RVU & reimbursement

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

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU	11.13
Practice expense RVU	37.17
Malpractice RVU	1.31
Total RVU	49.61
Medicare national rate	$1,657.02
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	$1,657.02
HOPD (APC 5165) Hospital outpatient department	$6,048.05
ASC (PI A2) Ambulatory surgical center (freestanding)	$3,025.62

Common denial reasons

The recurring reasons claims for CPT 21208 get rejected.

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

Missing or expired prior authorization — most commercial payers and some Medicaid programs list 21208 as requiring pre-auth.
Diagnosis code mismatch: payers deny when the linked ICD-10 code does not clearly support bony augmentation (e.g., cosmetic-appearing diagnosis without documented functional impairment or structural defect).
Unbundling conflict when concurrent craniofacial or rhinoplasty codes are billed same-day without a modifier establishing distinct procedural service.
Insufficient operative documentation — auditors flag notes that fail to name the specific bone augmented or identify the graft/implant material.
Cosmetic exclusion: payers reclassify the procedure as cosmetic when pre-op imaging or clinical notes do not document a post-traumatic or congenital structural deficit.

Frequently asked questions

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

01Does 21208 include harvesting the autograft?

Generally yes — when autogenous bone or cartilage is harvested at the same operative session solely for the facial augmentation, the harvest is considered inclusive. Do not separately code the harvest. If a distinct, separately identifiable donor-site procedure is performed, document it thoroughly and confirm NCCI edits before billing.

02Can 21208 be used for nasal dorsum augmentation with allograft or prosthetic implant?

Yes. Per ASPS guidance, 21208 is the correct code when augmenting the nasal bones or dorsum with a prosthetic implant or cadaveric allograft such as a rib-cartilage graft. Rhinoplasty codes are not the right vehicle when the primary work is bony augmentation.

03Is prior authorization required for 21208?

Most commercial payers and at least some state Medicaid programs (New York Medicaid explicitly lists it) require prior authorization. Obtain auth before scheduling — retroactive auth requests for this code are routinely denied. Document the auth number in the claim record.

04What modifier applies if the patient returns within the 90-day global for a complication requiring reoperation at the same site?

Use modifier 78 for an unplanned return to the OR for a complication related to the original augmentation procedure. Modifier 79 applies only if the return procedure is entirely unrelated to the original surgery.

05How do you bill a same-day E/M with 21208?

A significant, separately documented evaluation and management service on the day of surgery — for a problem unrelated to the augmentation — requires modifier 25 on the E/M code. Routine pre-surgical assessment is bundled into the 90-day global and cannot be billed separately.

06Can 21208 and 21209 (facial bone reduction) be billed together on the same date?

Billing augmentation (21208) and reduction (21209) on the same facial bone same-day will attract close scrutiny and likely an NCCI bundling denial. If genuinely distinct anatomic sites are involved, modifier 59 or XS with strong operative documentation is required to support separate billing.

07What ICD-10 codes support medical necessity for 21208?

Post-traumatic facial deformity codes (e.g., M95.0, M95.2, sequelae of facial fracture), congenital craniofacial anomalies, and acquired deformities following ablative surgery are the strongest supports. Cosmetic-appearing diagnoses without documented functional or structural deficit are the primary driver of cosmetic-exclusion denials.

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 augmentation site by anatomic name, graft or implant material, surgical approach, fixation technique, and the clinical indication (congenital, traumatic, or acquired defect) directly from dictation. That specificity prevents the two most common denial triggers for 21208: a vague operative note that can't survive a cosmetic-exclusion audit and a diagnosis code that doesn't match the documented structural deficit.

See how Mira captures CPT 21208 documentation