ICD-10-CM > M00-M99 > M60-M63 > M61 > M61.1 > M61.16 M61.16 Myositis ossificans progressiva, lower leg Non-Billable/Non-Specific Codes M61.161Myositis ossificans progressiva, right lower legM61.162Myositis ossificans progressiva, left lower legM61.169Myositis ossificans progressiva, unspecified lower leg