ICD-10-CM > M00-M99 > M60-M63 > M60 > M60.1 > M60.17 M60.17 Interstitial myositis, ankle and foot Non-Billable/Non-Specific Codes M60.171Interstitial myositis, right ankle and footM60.172Interstitial myositis, left ankle and footM60.179Interstitial myositis, unspecified ankle and foot