M90.839 Osteopathy in diseases classified elsewhere, unspecified forearm

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 M90.839

Back-references to M90

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

Diagnosis Index entries for M90.839

• Osteomalacia › vitamin-D-resistant in adults › ulna

Nearby codes

• M90.822 Osteopathy in diseases classified elsewhere, left upper arm
• M90.829 Osteopathy in diseases classified elsewhere, unspecified upper arm
• M90.83 Osteopathy in diseases classified elsewhere, forearm
• M90.831 Osteopathy in diseases classified elsewhere, right forearm
• M90.832 Osteopathy in diseases classified elsewhere, left forearm
• M90.839 Osteopathy in diseases classified elsewhere, unspecified forearm (this code)
• M90.84 Osteopathy in diseases classified elsewhere, hand
• M90.841 Osteopathy in diseases classified elsewhere, right hand
• M90.842 Osteopathy in diseases classified elsewhere, left hand
• M90.849 Osteopathy in diseases classified elsewhere, unspecified hand
• M90.85 Osteopathy in diseases classified elsewhere, thigh