M27.2 classifies bone and periosteal inflammatory conditions of the jaw, including osteitis, osteomyelitis, osteoradionecrosis, periostitis, and sequestrum of jaw bone.

Documentation tips

What should appear in the chart to support M27.2.

Source · Editorial brief grounded in 5 cited references ↓

• Specify the jaw affected (mandible vs. maxilla) and whether the process is unilateral or bilateral — M27.2 has no laterality subcode, but surgical records and imaging reports should reflect this for medical necessity.
• If radiation is the documented cause, the provider note must explicitly link the jaw condition to radiation history; this supports appending W88–W90 or X39.0 as a secondary code.
• Document the specific inflammatory diagnosis by name (e.g., 'osteomyelitis of mandible,' 'osteoradionecrosis of jaw,' 'periostitis') rather than generic 'jaw infection' — the Applicable To list terms map directly to M27.2 and support code assignment.
• When bisphosphonate or antiresorptive drug therapy is the documented precipitating factor, the provider must state this clearly so the coder can route to M87.180 instead of M27.2.
• Include staging or severity information (e.g., AAOMS staging for BRONJ/MRONJ, extent of bone exposure, presence of sequestrum) to support medical necessity for surgical intervention.

Related CPT procedures

Procedure codes commonly billed with M27.2. Linking the right diagnosis to the right procedure is what establishes medical necessity.

Source · CMS LCDs · AAOS specialty guidance · claims-pattern analysis

Common coding pitfalls

The recurring mistakes coders make with M27.2 and adjacent codes.

Source · Editorial brief grounded in CDC ICD-10-CM tabular guidance, AAOS coding references, and cited references ↓

• Coding M27.2 for medication-related osteonecrosis of the jaw (MRONJ): the Excludes2 note directs that condition to M87.180; using M27.2 alone misclassifies the etiology and may trigger a payer query.
• Omitting the secondary radiation cause code (W88–W90 or X39.0) when osteoradionecrosis is documented — the 'Use Additional Code' instruction is mandatory when radiation etiology is established, not discretionary.
• Confusing M27.2 with M27.3 (alveolitis of jaws, i.e., dry socket): alveolitis is a separate code for post-extraction alveolar inflammation and should not be coded to M27.2.
• Using M27.2 for temporomandibular joint (TMJ) inflammatory conditions: TMJ arthritis and synovitis map to M26.6x codes, not M27.2, which is limited to bone and periosteal pathology of the jaw.

Clinical context

Source · Editorial summary grounded in 5 cited references ↓

Inclusion & exclusion notes

Per the official ICD-10-CM Tabular List.

Source · CDC ICD-10-CM Official Tabular List · 2026

Sibling codes

Other billable codes under M27 (laterality / anatomic variants).