ICD-10-CM > M00-M99 > M60-M63 > M60 > M60.0 > M60.03 M60.03 Infective myositis, forearm Non-Billable/Non-Specific Codes M60.031Infective myositis, right forearmM60.032Infective myositis, left forearmM60.039Infective myositis, unspecified forearm