Open surgical removal of the coronoid process of the mandible, performed as a separate procedure to restore jaw mobility or address structural pathology.
Verified May 8, 2026 · 7 sources ↓
- Medicare
- $540.09
- Total RVUs
- 16.17
- Global, days
- 90
- Region
- Other
Documentation requirements
What must appear in the operative or office note to support the claim.
Source · Editorial brief grounded in 7 cited references ↓
- Clinical indication documented: trismus, ankylosis, TMJ disorder, or radiographically confirmed coronoid hyperplasia/malformation
- Failure of conservative treatment noted before proceeding to surgical intervention
- Preoperative imaging (CT, X-ray, or MRI) confirming coronoid process pathology
- Operative note specifying surgical approach — intraoral vs. external — and extent of resection (partial vs. complete)
- Anesthesia type documented (general anesthesia standard for this procedure)
- Post-resection assessment of jaw range of motion recorded in the operative note
Applicable modifiers
Modifiers commonly billed with this code.
Source · AMA CPT modifier descriptors · CMS NCCI Policy Manual
What this code covers
Source · Editorial summary grounded in 7 cited references ↓
CPT 21070 describes an open coronoidectomy — surgical excision of the coronoid process of the mandible (lower jaw). The procedure addresses conditions that mechanically restrict mouth opening, including trismus, ankylosis, temporomandibular joint disorders, abnormal coronoid hyperplasia, or post-traumatic bony obstruction. Conservative treatment failure and radiographic evidence of a malformed or elongated coronoid process are standard indications.
The surgeon accesses the coronoid process via an intraoral incision through the oral mucosa or, when anatomy dictates, an external facial approach. Specialized instruments resect the process, the wound is closed with sutures, and drains may be placed. The procedure is performed under general anesthesia in a hospital or ASC setting and typically takes one to two hours. Oral and maxillofacial surgeons perform the vast majority of these cases.
The code carries a 90-day global period. All routine postoperative management through day 90 — including wound checks, suture removal, and jaw mobilization follow-up — is included in the global payment. A separate E/M during the global period requires modifier 24 (unrelated) or modifier 25 (same-day, significant and separately identifiable). If the decision for surgery is made at the day-of or day-before visit, append modifier 57 to that E/M, not modifier 25.
RVU & reimbursement
Component RVUs and Medicare national rate. Actual payment varies by GPCI locality.
Source · CMS Physician Fee Schedule, RVU26A · January 2026
| Work RVU | 8.4 |
| Practice expense RVU | 6.54 |
| Malpractice RVU | 1.23 |
| Total RVU | 16.17 |
| Medicare national rate | $540.09 |
| 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 | $540.09 |
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 21070 get rejected.
Source · Editorial brief grounded in CMS NCCI edits, AAOS coding appeals, and cited references ↓
- Lack of documented conservative treatment failure prior to surgical authorization
- Missing or insufficient preoperative imaging to support medical necessity of coronoidectomy
- Operative note does not specify the approach or extent of bone resection, triggering audit flags
- Separate procedure designation misunderstood — 21070 bundled inappropriately when billed alongside a more comprehensive jaw procedure without a modifier
- E/M billed during the 90-day global period without modifier 24 or 25 to distinguish it from included postoperative care
Frequently asked questions
Source · Generated from the editorial pipeline, verified against 7 cited references ↓
01What is the global period for CPT 21070, and what does it include?
02When should modifier 57 be used with 21070?
03Can CPT 21070 be billed the same day as a more comprehensive jaw or TMJ procedure?
04What ICD-10 diagnoses most commonly support medical necessity for coronoidectomy?
05Is modifier 22 ever appropriate for 21070?
06How does the HOPD vs. ASC payment difference affect site-of-service decisions for 21070?
Sources & references
Editorial content was developed using the following public sources. Last verified May 8, 2026.
- 01aapc.comhttps://www.aapc.com/codes/cpt-codes/21070
- 02genhealth.aihttps://genhealth.ai/code/cpt4/21070-coronoidectomy-separate-procedure
- 03bedrockbilling.comhttps://bedrockbilling.com/static/cci/21070
- 04vsac.nlm.nih.govhttps://vsac.nlm.nih.gov/context/cs/codesystem/CPT/version/2024/code/21070/info
- 05cms.govhttps://www.cms.gov/files/document/08-chapter8-ncci-medicare-policy-manual-2026-final.pdf
- 06aaos.orghttps://www.aaos.org/globalassets/quality-and-practice-resources/coding-and-reimbursement/resident-guide/resident-guide_modifiers.pdf
- 07CMS Physician Fee Schedule 2026
Mira AI Scribe
Mira's AI scribe captures the surgical approach (intraoral vs. external), extent of coronoid resection, preoperative jaw range-of-motion measurements, and the specific pathology driving the procedure — hyperplasia, ankylosis, post-traumatic restriction. It also flags whether conservative treatment failure is documented in the record. Missing any of these elements is the primary trigger for prior authorization denials and post-payment audit requests on 21070.
See how Mira captures CPT 21070 documentation