Critical illness myopathy

This code represents a severe, generalized muscle weakness that develops in critically ill patients, often those in the intensive care unit (ICU). It is a direct consequence of the critical illness itself, not a pre-existing neuromuscular disorder, and can lead to prolonged ventilator dependence and functional impairment. The myopathy is characterized by diffuse flaccid weakness, particularly affecting the proximal muscles and diaphragm.

Assign this code when documentation clearly indicates a diagnosis of critical illness myopathy in a patient experiencing severe illness. This diagnosis is typically made in the ICU setting based on clinical presentation, exclusion of other neuromuscular disorders, and sometimes supported by electrophysiological studies (e.g., EMG). Documentation should specify the link between the critical illness and the development of myopathy.

• Ensure the documentation explicitly states "critical illness myopathy" or a similar definitive diagnosis, distinguishing it from other types of myopathy.
• This code should be sequenced after the code for the underlying critical illness (e.g., sepsis, multiorgan failure) that precipitated the myopathy.
• Do not use this code for generalized weakness not directly attributed to critical illness; consider codes for generalized muscle weakness (R53.1) or other specified myopathies if applicable.