Myoadenylate deaminase deficiency

This code identifies a rare metabolic disorder characterized by a deficiency in the enzyme myoadenylate deaminase (MAD). This enzyme is crucial for purine metabolism in muscle cells, and its deficiency can lead to impaired energy production during strenuous activity. Patients typically experience muscle pain, cramping, and fatigue, particularly after exercise.

Use this code when documentation explicitly states a diagnosis of myoadenylate deaminase deficiency, often confirmed by muscle biopsy showing reduced or absent MAD activity. It is appropriate for patients presenting with exercise-induced myalgia, fatigue, or cramps where this specific enzyme defect has been identified as the underlying cause.

• Ensure documentation specifies "myoadenylate deaminase deficiency" to differentiate from other metabolic myopathies.
• Do not confuse with other purine metabolism disorders unless MAD deficiency is explicitly stated.
• Consider sequencing this code as a primary diagnosis when it is the reason for the encounter, or as a secondary diagnosis if it is a co-morbidity impacting patient care.