ICD-10-CM > R00-R99 > R50-R69 > R53 > R53.8 > R53.82 R53.82 Chronic fatigue, unspecified Billable/Specific Copy Code Copy Description Type 1 Excludes chronic fatigue syndrome (G93.32)myalgic encephalomyelitis (G93.32)other post infection and related fatigue syndromes (G93.39)postviral fatigue syndrome (G93.31)