Muscle wasting and atrophy, NEC, left forearm

This code signifies a reduction in muscle mass and size in the patient's left forearm, not due to a specific neurological disease or other classified condition. This atrophy can result in weakness and functional impairment of the affected limb. It represents a non-specific muscle wasting that requires further investigation into its underlying cause.

Use this code when documentation clearly indicates muscle atrophy or wasting specifically in the left forearm, and the etiology is not yet determined or is not attributable to a more specific condition (e.g., muscular dystrophy, denervation atrophy). Supporting documentation would include physical examination findings noting decreased muscle bulk, circumference measurements, and/or patient complaints of weakness localized to the left forearm.

• Ensure the documentation specifies "left forearm" to accurately assign this laterality-specific code.
• Avoid using this code if a more specific cause for the muscle atrophy (e.g., disuse atrophy from a fracture, neurological condition) is identified and has a dedicated ICD-10-CM code.
• Always sequence this code after the primary diagnosis if the muscle wasting is a symptom or complication of another underlying condition.