CPT 21031Surgery

Remove exostosis mandible

CPT code 21031 covers the surgical removal of a bony growth (exostosis) from the mandible (lower jaw bone). This is a relatively minor oral surgery procedure typically performed to address painful or problematic bone overgrowths.

Showing rates for

National Average

Base Medicare rate

$371.34

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

3.3

PE RVU (NF)

7.84

MP RVU

0.34

Total RVU

11.48

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

NCCI bundling edits

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Billing tips

Verify place of service accuracy - facility versus non-facility settings have a $103.83 reimbursement difference
Impact: Incorrect POS coding can result in $103.83 underpayment (27.9% revenue loss) or overpayment recoupment
Document bilateral removal clearly in operative report to support modifier 50; some payers require specific anatomical descriptions of both sides
Impact: Proper bilateral coding yields $557.01 versus $371.34 for unilateral, a difference of $185.67 (50% increase)
Link appropriate ICD-10 codes (M27.8 for exostosis of jaw) to establish medical necessity; denture-related indications require K08.1xx codes as well
Impact: Missing or incorrect diagnosis codes account for 35-40% of denials for this procedure
Do not unbundle pathology services if tissue is sent for histopathology; code 88305 separately only when documented as distinct service
Impact: Unbundling violations can trigger recoupment plus penalties; proper pathology billing adds $50-75 when medically indicated
For commercial payers, verify coverage policies as some classify this as dental versus medical; obtain predetermination when indicated for prosthetic necessity
Impact: Dental exclusions can result in 100% claim denial; predetermination reduces write-offs by 60-70%
When performed with other oral surgery procedures, check NCCI edits carefully; alveoloplasty codes (41870-41874) may bundle depending on anatomical location
Impact: NCCI violations cause automatic denials; proper sequencing with modifier 59 when appropriate can preserve $200-400 in additional procedures

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Frequently asked questions

What is the Medicare reimbursement rate for CPT 21031 in 2025?

The 2025 Medicare national average reimbursement for CPT 21031 is $371.34 for non-facility settings and $267.51 for facility settings. These rates are based on 11.48 total RVUs (3.3 work RVU, 7.84 non-facility PE RVU, 0.34 MP RVU) multiplied by the 2025 conversion factor of 32.3465.

Can CPT 21031 be billed bilaterally with modifier 50?

Yes, CPT 21031 can be billed with modifier 50 when mandibular exostoses are removed from both the right and left sides during the same operative session. Medicare and most commercial payers reimburse bilateral procedures at 150% of the unilateral rate, requiring detailed operative documentation of work performed on both sides.

Is removal of mandibular tori covered by medical insurance or dental insurance?

Coverage varies by payer and policy. While CPT 21031 is a medical surgical code, some insurers classify mandibular exostosis removal under dental benefits when performed for prosthetic purposes. Medical insurance is more likely to cover when documented medical necessity includes chronic ulceration, pain, or anatomical obstruction beyond dental appliance considerations. Always verify benefits and obtain predetermination for commercial plans.

What diagnosis codes should be used with CPT 21031?

The primary diagnosis code for mandibular exostosis is M27.8 (Other specified diseases of jaws). Supporting codes may include K08.1xx series for edentulism classifications when removal is necessary for denture fabrication, R13.19 for dysphagia when applicable, or R47.89 for speech disturbances. Medical necessity documentation should align with the diagnosis codes submitted.

What is the global period for CPT 21031?

CPT 21031 has a 90-day global surgical period. This means routine postoperative care for 90 days following the procedure is included in the reimbursement and should not be billed separately. Complications requiring return to the operating room would be reported with modifier 78, while unrelated procedures during this period require modifier 79.

Can CPT 21031 be billed with alveoloplasty codes on the same date of service?

Generally no, unless performed at distinctly separate anatomical sites with clear documentation. NCCI edits often bundle alveoloplasty codes (41870-41874) with 21031 when performed in the same surgical field. If truly distinct procedures at separate sites, modifier 59 or X-modifiers (XS, XU) may be appropriate with detailed documentation, but expect payer scrutiny and potential denials requiring appeal.

How should pathology services be coded when tissue from CPT 21031 is sent for examination?

When mandibular exostosis tissue is sent for pathological examination, CPT 88305 (surgical pathology, gross and microscopic examination, bone exostosis) is the appropriate code. This is separately reportable from 21031 when pathology services are medically indicated and documented. Routine pathology is not always required for clearly benign exostoses, so medical necessity for tissue examination should be documented.