M90.821 Osteopathy in diseases classified elsewhere, right upper arm

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)

• 730.82 Other infections involving bone in diseases classified elsewhere, upper arm (approximate)
• 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 M90.821

Back-references to M90

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

Nearby codes

• M90.81 Osteopathy in diseases classified elsewhere, shoulder
• M90.811 Osteopathy in diseases classified elsewhere, right shoulder
• M90.812 Osteopathy in diseases classified elsewhere, left shoulder
• M90.819 Osteopathy in diseases classified elsewhere, unspecified shoulder
• M90.82 Osteopathy in diseases classified elsewhere, upper arm
• M90.821 Osteopathy in diseases classified elsewhere, right upper arm (this code)
• 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