Surgical excision of a torus mandibularis — a benign bony prominence on the lingual surface of the mandible — when size, location, or functional impairment warrants removal.

Documentation requirements

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

Source · Editorial brief grounded in 6 cited references ↓

• Operative note must name the specific location of the torus (lingual mandible, unilateral vs. bilateral) and document size of the excised specimen.
• Medical necessity narrative: document functional impairment such as prosthetic appliance interference, recurrent ulceration, dysphagia, or pain — not cosmetic rationale.
• Anesthesia type used (local vs. general) and any monitored anesthesia care, since anesthesia billing runs parallel and payers may request concordance.
• Pathology submission or clinical disposition of the excised specimen, which supports the benign diagnosis code and demonstrates due diligence.
• Pre-operative imaging or clinical photos if the torus size or complexity is used to support a modifier 22 claim for increased procedural services.
• ICD-10-CM diagnosis code tied to functional impairment (e.g., K10.0 for developmental jaw disorders) rather than a symptom-only code.

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 6 cited references ↓

RVU & reimbursement

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

Source · CMS Physician Fee Schedule, RVU26A · January 2026

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

Common denial reasons

The recurring reasons claims for CPT 21031 get rejected.

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

• Lack of medical necessity: operative note documents cosmetic or patient-preference rationale rather than functional impairment — the single most common denial trigger.
• Procedure billed to a medical payer when the patient's dental insurer holds primary responsibility; torus excision sits at the medical-dental crossover and payers dispute coordination of benefits.
• Bilateral torus excision billed as two units without modifier 50, or billed as two line items without adequate distinction, triggering a duplicate-service edit.
• E/M visit billed same-day without modifier 25, causing the evaluation to be bundled into the surgical package even when it was a separately identifiable decision-for-surgery encounter.
• Missing or inadequate pathology documentation when the excised tissue was not sent or the report is absent, prompting medical record requests that stall payment.