ICD-10-CM > M00-M99 > M60-M63 > M62 > M62.8 M62.8 Other specified disorders of muscle Non-Billable/Non-Specific Type 2 Excludes nontraumatic hematoma of muscle (M79.81) Codes M62.81Muscle weakness (generalized)M62.82RhabdomyolysisM62.83Muscle spasmM62.830Muscle spasm of backM62.831Muscle spasm of calfM62.838Other muscle spasmM62.84SarcopeniaM62.85Dysfunction of the multifidus muscles, lumbar regionM62.89Other specified disorders of muscle