ICD-10-CM > M00-M99 > M60-M63 > M60 > M60.1 > M60.15 M60.15 Interstitial myositis, thigh Non-Billable/Non-Specific Codes M60.151Interstitial myositis, right thighM60.152Interstitial myositis, left thighM60.159Interstitial myositis, unspecified thigh