G73.7 Myopathy in diseases classified elsewhere

Billable ICD-10-CM code, FY2026.

Excludes1 (never code together)

• myopathy in:
• rheumatoid arthritis (M05.32)
• sarcoidosis (D86.87)
• scleroderma (M34.82)
• Sjögren syndrome (M35.03)
• systemic lupus erythematosus (M32.19)

Code first

• underlying disease, such as:
• glycogen storage disease (E74.0-)
• hyperparathyroidism (E21.0, E21.3)
• hypoparathyroidism (E20.-)
• lipid storage disorders (E75.-)

MS-DRG index

Defines the logic of DRG(s) 091-093 in MDC 01.

Approximate ICD-9-CM (GEMs)

• 359.5 Myopathy in endocrine diseases classified elsewhere (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

• Manifestation codes as principal diagnosis: Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and are not allowed as principal diagnosis.

Code annotations containing back-references to G73.7

Back-references to G73.7

• Type 1 Excludes: M63 Disorders of muscle in diseases classified elsewhere ("myopathy in endocrine diseases (G73.7)")
• Type 1 Excludes: M63 Disorders of muscle in diseases classified elsewhere ("myopathy in metabolic diseases (G73.7)")

Back-references to G73

• Code First: M62.84 Sarcopenia ("disorders of myoneural junction and muscle disease in diseases classified elsewhere (G73.-)")

Diagnosis Index entries for G73.7

• Hoffmann's syndrome
• Myopathy › endocrine NEC
• Myopathy › in (due to) › Addison's disease
• Myopathy › in (due to) › amyloidosis
• Myopathy › in (due to) › cretinism
• Myopathy › in (due to) › Cushing's syndrome
• Myopathy › in (due to) › endocrine disease NEC
• Myopathy › in (due to) › giant cell arteritis
• Myopathy › in (due to) › glycogen storage disease
• Myopathy › in (due to) › hyperadrenocorticism
• Myopathy › in (due to) › hyperparathyroidism NEC
• Myopathy › in (due to) › hypoparathyroidism
• Myopathy › in (due to) › hypopituitarism
• Myopathy › in (due to) › hypothyroidism
• Myopathy › in (due to) › infectious disease NEC
• Myopathy › in (due to) › lipid storage disease
• Myopathy › in (due to) › metabolic disease NEC
• Myopathy › in (due to) › myxedema
• Myopathy › in (due to) › parasitic disease NEC
• Myopathy › in (due to) › polyarteritis nodosa
• Myopathy › in (due to) › thyrotoxicosis (hyperthyroidism)
• Myopathy › in (due to) › thyrotoxicosis (hyperthyroidism) › with thyroid storm

Nearby codes

• G73 Disorders of myoneural junction and muscle in diseases classified elsewhere
• G73.1 Lambert-Eaton syndrome in neoplastic disease
• G73.3 Myasthenic syndromes in other diseases classified elsewhere
• G73.7 Myopathy in diseases classified elsewhere (this code)