Osteoarthritis of the proximal interphalangeal (PIP) joints of the hand, presenting with characteristic bony enlargements and associated joint degeneration.

Documentation tips

What should appear in the chart to support M15.2.

Source · Editorial brief grounded in 5 cited references ↓

• Document 'Bouchard's nodes with arthropathy' explicitly — the arthropathy component is required to support M15.2; nodal presence alone is insufficient.
• Specify which PIP joints are affected (e.g., index, middle, ring, little finger, bilateral) to maximize clinical specificity, even though M15.2 carries no laterality subcode.
• Record imaging findings that confirm degenerative joint changes — joint space narrowing, subchondral sclerosis, or osteophyte formation on hand X-ray strengthen medical necessity.
• Note functional limitation or pain related to the PIP joints to support medical necessity for therapy, orthotics, or procedural intervention claims.
• If Heberden's nodes (DIP) are also present, document both; M15.1 and M15.2 may be reported together when both are clinically active.

Related CPT procedures

Procedure codes commonly billed with M15.2. 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 M15.2 and adjacent codes.

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

• Assigning M15.2 for cosmetic or asymptomatic nodules without documented arthropathy — the code explicitly requires arthropathy to be present.
• Defaulting to M19.90 (unspecified OA, unspecified site) when the provider has documented Bouchard's nodes — M15.2 is the more specific and correct code.
• Confusing Bouchard's nodes (PIP joints, M15.2) with Heberden's nodes (DIP joints, M15.1) — confirm anatomical location in the note before coding.
• Linking M15.2 to amniotic/placental-derived product injection claims without reviewing payer LCD; CMS has explicitly listed M15.2 among diagnoses that do not support medical necessity for those procedures.
• Omitting a co-coded M15.1 when both PIP and DIP nodal arthropathy are documented in the same encounter — both codes should be reported.

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 M15 (laterality / anatomic variants).