M62.5A1 Muscle wasting and atrophy, not elsewhere classified, back, thoracic

Billable ICD-10-CM code, FY2026.

Applies from M62 Other disorders of muscle

Excludes1 (never code together)

• alcoholic myopathy (G72.1)
• cramp and spasm (R25.2)
• drug-induced myopathy (G72.0)
• myalgia (M79.1-)
• stiff-man syndrome (G25.82)

Excludes2 (not included here)

• nontraumatic hematoma of muscle (M79.81)

Applies from M62.5 Muscle wasting and atrophy, not elsewhere classified

Applicable to

• Disuse atrophy NEC

Excludes1 (never code together)

• neuralgic amyotrophy (G54.5)
• progressive muscular atrophy (G12.21)
• sarcopenia (M62.84)

Excludes2 (not included here)

• pelvic muscle wasting (N81.84)

MS-DRG index

Defines the logic of DRG(s) 557-558 in MDC 08.

Diagnosis Index entries for M62.5A1

• Atrophy, atrophic (of) › muscle, muscular (diffuse) (general) (idiopathic) (primary) › back › thoracic

Nearby codes

• M62.579 Muscle wasting and atrophy, not elsewhere classified, unspecified ankle and foot
• M62.58 Muscle wasting and atrophy, not elsewhere classified, other site
• M62.59 Muscle wasting and atrophy, not elsewhere classified, multiple sites
• M62.5A Muscle wasting and atrophy, not elsewhere classified, back
• M62.5A0 Muscle wasting and atrophy, not elsewhere classified, back, cervical
• M62.5A1 Muscle wasting and atrophy, not elsewhere classified, back, thoracic (this code)
• M62.5A2 Muscle wasting and atrophy, not elsewhere classified, back, lumbosacral
• M62.5A9 Muscle wasting and atrophy, not elsewhere classified, back, unspecified level
• M62.8 Other specified disorders of muscle
• M62.81 Muscle weakness (generalized)
• M62.82 Rhabdomyolysis