Disord of muscle in diseases classd elswhr, unsp upper arm

This code signifies an unspecified muscular disorder affecting the upper arm, arising as a manifestation of another underlying disease process. It indicates a secondary muscle involvement where the primary etiology is classified elsewhere in the ICD-10-CM system.

Apply this code when documentation specifies a muscle disorder of the upper arm that is secondary to another condition, and the specific type of muscle disorder (e.g., myositis, myopathy) is not detailed. This code requires a primary diagnosis code for the underlying disease.

• Always sequence this code after the primary diagnosis code for the underlying disease.
• Avoid using this code if a more specific muscle disorder (e.g., M60.029 for infective myositis, unspecified upper arm) can be identified.
• Ensure documentation clearly links the upper arm muscle disorder to an "elsewhere classified" disease.