Disorders of muscle in diseases classified elsewhere (M63) ICD-10-CM

Code First

Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.

• underlying disease, such as:
• leprosy A30
• neoplasm C49 C79.89 D21 D48.1
• schistosomiasis B65
• trichinellosis B75

Type 1 Excludes

A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.

• myopathy in cysticercosis B69.81
• myopathy in endocrine diseases G73.7
• myopathy in metabolic diseases G73.7
• myopathy in sarcoidosis D86.87
• myopathy in secondary syphilis A51.49
• myopathy in syphilis late A52.78
• myopathy in toxoplasmosis B58.82
• myopathy in tuberculosis A18.09