M90.879 Osteopathy in diseases classified elsewhere, unspecified ankle and foot

Billable ICD-10-CM code, FY2026.

Applies from M90 Osteopathies in diseases classified elsewhere

Excludes1 (never code together)

• osteochondritis, osteomyelitis, and osteopathy (in):
• cryptococcosis (B45.3)
• diabetes mellitus (E08-E13 with .69-)
• gonococcal (A54.43)
• neurogenic syphilis (A52.11)
• renal osteodystrophy (N25.0)
• salmonellosis (A02.24)
• secondary syphilis (A51.46)
• syphilis (late) (A52.77)

Applies from M90.8 Osteopathy in diseases classified elsewhere

Code first

• underlying disease, such as:
• rickets (E55.0)
• vitamin-D-resistant rickets (E83.31)

MS-DRG index

Defines the logic of DRG(s) 553-554 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 731.8 Other bone involvement in diseases classified elsewhere (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

• Manifestation codes as principal diagnosis: Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and are not allowed as principal diagnosis.

Code annotations containing back-references to M90.879

Back-references to M90

• Type 1 Excludes: M87 Osteonecrosis ("osteochondropathies (M90-M93)")

Diagnosis Index entries for M90.879

• Osteomalacia › vitamin-D-resistant in adults › tarsus
• Osteomalacia › vitamin-D-resistant in adults › toe

Nearby codes

• M90.862 Osteopathy in diseases classified elsewhere, left lower leg
• M90.869 Osteopathy in diseases classified elsewhere, unspecified lower leg
• M90.87 Osteopathy in diseases classified elsewhere, ankle and foot
• M90.871 Osteopathy in diseases classified elsewhere, right ankle and foot
• M90.872 Osteopathy in diseases classified elsewhere, left ankle and foot
• M90.879 Osteopathy in diseases classified elsewhere, unspecified ankle and foot (this code)
• M90.88 Osteopathy in diseases classified elsewhere, other site
• M90.89 Osteopathy in diseases classified elsewhere, multiple sites