M60.121 Interstitial myositis, right upper arm

Billable ICD-10-CM code, FY2026.

Applies from M60 Myositis

Excludes2 (not included here)

• inclusion body myositis [IBM] (G72.41)

MS-DRG index

Defines the logic of DRG(s) 557-558 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 728.81 Interstitial myositis (approximate)

Code annotations containing back-references to M60.121

Back-references to M60

• Type 2 Excludes: G71 Primary disorders of muscles ("myositis (M60.-)")
• Type 1 Excludes: G72 Other and unspecified myopathies ("myositis (M60.-)")
• Type 1 Excludes: M79.1 Myalgia ("myositis (M60.-)")

Nearby codes

• M60.11 Interstitial myositis, shoulder
• M60.111 Interstitial myositis, right shoulder
• M60.112 Interstitial myositis, left shoulder
• M60.119 Interstitial myositis, unspecified shoulder
• M60.12 Interstitial myositis, upper arm
• M60.121 Interstitial myositis, right upper arm (this code)
• M60.122 Interstitial myositis, left upper arm
• M60.129 Interstitial myositis, unspecified upper arm
• M60.13 Interstitial myositis, forearm
• M60.131 Interstitial myositis, right forearm
• M60.132 Interstitial myositis, left forearm