CPT 21070Surgery

Remove coronoid process

CPT code 21070 covers the surgical removal of the coronoid process, a small hook-shaped bone projection on the lower jaw (mandible). This procedure is typically performed to treat jaw disorders that limit mouth opening or cause chronic pain.

Showing rates for

National Average

Base Medicare rate

$598.09

This calculator gives a typical-case estimate using standard Medicare modifier rules. Actual payment depends on payer policies, documentation, code-specific CMS status indicators, and locality. Verify before billing.

RVU breakdown

Work RVU

8.62

PE RVU (NF)

8.61

MP RVU

1.26

Total RVU

18.49

Conversion factor: 32.3465 · Source: CMS MPFS RVU25A · Confidence: High

NCCI bundling edits

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Billing tips

Document exact interincisal distance measurements pre-operatively and post-operatively to establish medical necessity
Impact: Prevents $598.09 denial for cosmetic or experimental designation; measurements below 30mm strongly support medical necessity
Verify whether facility or non-facility setting applies as both show identical $598.09 rate for 21070, allowing flexibility in site of service planning
Impact: Unique rate parity enables cost-effective site selection without reimbursement penalty
For bilateral procedures, bill with modifier 50 rather than two line items with RT/LT to ensure proper 150% payment calculation
Impact: Correct billing yields $897.14 vs potential underpayment of $598.09 if billed incorrectly as single side
Include detailed photographic or radiographic documentation of coronoid hyperplasia or impingement in medical record before submitting claim
Impact: Reduces audit risk and expedites prior authorization; panoramic radiographs or CT scans showing abnormal coronoid morphology strengthen medical necessity by 40-60%
Do not bundle anesthesia services; bill separately using appropriate anesthesia code (00190) for procedures on facial bones
Impact: Anesthesia typically adds $200-400 to total reimbursement when billed correctly by anesthesia provider
If performed with TMJ arthroscopy or arthroplasty, sequence codes by RVU value and append modifier 51 to lower-valued procedures
Impact: Proper sequencing maximizes total reimbursement; 21070 with 18.49 RVUs often becomes primary procedure

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Frequently asked questions

What is the Medicare reimbursement rate for CPT 21070 in 2025?

The 2025 Medicare national average reimbursement for CPT 21070 is $598.09 for both facility and non-facility settings. This rate is based on 18.49 total RVUs (8.62 work RVU, 8.61 practice expense RVU, 1.26 malpractice RVU) multiplied by the 2025 conversion factor of 32.3465.

How do I bill CPT 21070 for bilateral coronoid process removal?

Bill CPT 21070 with modifier 50 (bilateral procedure) on a single line item. Medicare and most commercial payers reimburse bilateral coronoidectomy at 150% of the unilateral rate ($897.14 total). Documentation must clearly indicate both right and left coronoid processes were removed during the same operative session with separate medical necessity for each side.

Can CPT 21070 be billed with TMJ arthroscopy on the same day?

Yes, but modifier 51 (multiple procedures) or 59 (distinct procedural service) is typically required. The coronoidectomy addresses extra-articular mechanical obstruction while arthroscopy addresses intra-articular pathology. The secondary procedure will be reduced by 50% per multiple procedure rules. Documentation must clearly demonstrate separate anatomic targets and independent therapeutic purposes to avoid bundling denials.

What diagnosis codes support medical necessity for CPT 21070?

Common supporting ICD-10 codes include M26.69 (other specified disorders of temporomandibular joint), M26.61 (adhesions and ankylosis of TMJ), M84.80 (other disorders of continuity of bone, unspecified site), K07.65 (dentofacial functional abnormality), and S02.66 (fracture of coronoid process). Documentation must link the diagnosis to functional impairment such as restricted mouth opening or mastication difficulty.

What are the documentation requirements to prevent denials for CPT 21070?

Essential documentation includes pre-operative interincisal distance measurement (typically <30mm), radiographic evidence of coronoid abnormality, minimum 3-6 months of failed conservative therapy, detailed operative note describing approach and extent of resection, and post-operative improvement in range of motion. Photographic or radiographic imaging showing coronoid hyperplasia or impingement significantly strengthens the claim.

Is prior authorization required for CPT 21070?

Prior authorization requirements vary by payer. Medicare typically does not require prior authorization for 21070, but Medicare Advantage plans and commercial insurers frequently do require it. Submit clinical notes, imaging studies, conservative treatment documentation, and functional measurements with authorization requests. Processing time is typically 3-14 business days depending on payer.

What is the global period for CPT 21070?

CPT 21070 has a 90-day global surgical period. This includes pre-operative evaluation on the day before or day of surgery, the procedure itself, and routine post-operative care for 90 days. Any separately identifiable E/M service during the global period requires modifier 24 (unrelated) or 25 (significant, separately identifiable) with clear documentation of why the service falls outside routine post-operative care.