ICD-10 Code G72.81 – Critical illness myopathy (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G72.81 – Critical illness myopathy
What it is
G72.81 identifies critical illness myopathy, a muscle disorder that develops during or after severe illness. It reflects generalized muscle weakness related to prolonged critical care, not a primary inherited myopathy.
Clinical signs
Typical findings include diffuse weakness, reduced muscle tone, and difficulty weaning from mechanical ventilation. Clinical features vary; refer to documentation for the specific pattern and whether the weakness is attributed to critical illness.
When to use this code
Use this code when the provider documents critical illness myopathy as the diagnosis or a confirmed complication of severe illness. It may be appropriate in ICU cases with persistent weakness after prolonged hospitalization. If the record only says “weakness,” check documentation before coding.
Do not use for
Do not use it for nonspecific weakness, fatigue, or muscle pain without documentation of critical illness myopathy. Do not assign it when another neuromuscular disorder better explains the findings.
Coding tip
Code G72.81 only when the provider clearly links the muscle weakness to critical illness; otherwise, query for clarification.