G93.3Postviral and related fatigue syndromes

G93.3 is the ICD-10-CM diagnosis code for Postviral and related fatigue syndromes. It belongs to category G93 (other disorders of brain), block G89-G99 (other disorders of the nervous system) and chapter 6 (diseases of the nervous system). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within G93 (other disorders of brain), G93.3 is specifically for Postviral and related fatigue syndromes. Related codes cover cerebral cysts (G93.0), Anoxic brain damage, not elsewhere classified (G93.1), benign intracranial hypertension (G93.2), other and unspecified encephalopathy (G93.4), compression of brain (G93.5), cerebral edema (G93.6), Reye's syndrome (G93.7), other specified disorders of brain (G93.8) and 1 more.

To report this condition, pick the subcode that matches the documentation: G93.31 (syndrome), G93.32 (syndrome) and G93.39 (syndromes).

Don't report G93.3 together with the conditions in its Excludes1 note: chronic fatigue NOS (R53.82) and neurasthenia (F48.8).

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

It has been part of ICD-10-CM since the code set took effect on October 1, 2015, and changed in FY2023 (title revised).

Before ICD-10, this condition was coded in ICD-9-CM as 780.79 (other malaise and fatigue).