G93.31 Postviral fatigue syndrome

Billable ICD-10-CM code, FY2026.

Applies from G93.3 Postviral and related fatigue syndromes

Excludes1 (never code together)

• chronic fatigue NOS (R53.82)
• neurasthenia (F48.8)

Use additional code

• code, if applicable, for post COVID-19 condition, unspecified (U09.9)

MS-DRG index

Defines the logic of DRG(s) 947-948 in MDC 23.

Code annotations containing back-references to G93.31

Back-references to G93.31

• Type 1 Excludes: R53.82 Chronic fatigue, unspecified ("postviral fatigue syndrome (G93.31)")

Diagnosis Index entries for G93.31

• Syndrome › fatigue › postviral
• Syndrome › postviral NEC
• Syndrome › postviral NEC › fatigue

Nearby codes

• G93 Other disorders of brain
• G93.0 Cerebral cysts
• G93.1 Anoxic brain damage, not elsewhere classified
• G93.2 Benign intracranial hypertension
• G93.3 Postviral and related fatigue syndromes
• G93.31 Postviral fatigue syndrome (this code)
• G93.32 Myalgic encephalomyelitis/chronic fatigue syndrome
• G93.39 Other post infection and related fatigue syndromes
• G93.4 Other and unspecified encephalopathy
• G93.40 Encephalopathy, unspecified
• G93.41 Metabolic encephalopathy