ICD-10-CM > M00-M99 > M60-M63 > M61 > M61.5 > M61.56 M61.56 Other ossification of muscle, lower leg Non-Billable/Non-Specific Codes M61.561Other ossification of muscle, right lower legM61.562Other ossification of muscle, left lower legM61.569Other ossification of muscle, unspecified lower leg