Other post infection and related fatigue syndromes

This code represents a chronic and debilitating fatigue that persists following an infectious illness, where the specific diagnostic criteria for Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS) are not fully met, or when the etiology is clearly post-infectious but doesn't fit other specific fatigue syndromes. It characterizes a persistent, unexplained exhaustion that significantly impacts daily functioning after an infection.

Use this code for patients presenting with prolonged, disabling fatigue that began after a documented infection (e.g., mononucleosis, Lyme disease, COVID-19), but who do not meet the full diagnostic criteria for ME/CFS or other specified post-viral syndromes. Documentation should clearly link the onset of fatigue to a preceding infection and rule out other causes of fatigue.

• Ensure documentation explicitly states the fatigue is "post-infection" and "related."
• Do not use this code if the patient meets full diagnostic criteria for Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS); instead, use G93.32.
• Consider sequencing this code after the code for the original infection, if still relevant and active, or if the infection is being treated as the underlying cause of the fatigue.