G93.4Other and unspecified encephalopathy

G93.4 is the ICD-10-CM diagnosis code for other and unspecified encephalopathy. 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 7 subcodes must be used instead.

Within G93, choose G93.4 (Other and unspecified encephalopathy) only when documentation doesn't support a more specific option: cerebral cysts (G93.0), Anoxic brain damage, not elsewhere classified (G93.1), benign intracranial hypertension (G93.2), Postviral and related fatigue syndromes (G93.3), 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: G93.40 (unspecified), G93.41 (encephalopathy), G93.42 (cysts), G93.43 (cysts), G93.44 (spheroids), G93.45 (encephalopathy) and G93.49 (encephalopathy).

The conditions in its Excludes2 note aren't part of G93.4, but may be coded alongside it if the patient has both: alcoholic encephalopathy (G31.2), encephalopathy in diseases classified elsewhere (G94), hypertensive encephalopathy (I67.4) and toxic (metabolic) encephalopathy (G92.8).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.