Unspecified Catatonia 121
Coding note:  Include the name of the medical condition in the name of the mental disor-
der (e.g., 293.89 [F06.1]) catatonic disorder due to hepatic encephalopathy). The other
medical condition should be coded and listed separately immediately before the cata-
tonic disorder due to the medical condition (e.g., 572.2 [K71.90] hepatic encephalopathy;
293.89 [F06.1] catatonic disorder due to hepatic encephalopathy).
Diagnostic Features
The essential feature of catato nic disorder due to another me dical condition is the presence
of catatonia that is judged to be attributed to the physiological effects of another medical
condition. Catatonia can be diagnosed by the pres ence of at least three of the 12 clinical fea-
tures in Criterion A. There must be evidence  from the history, physical examination, or
laboratory findings that the catatonia is attr ibutable to another medical condition (Crite-
rion B). The diagnosis is not given if the ca tatonia is better explained by another mental
disorder (e.g., manic episode) (Criterion C) or if it occurs exclusivel y during the course of
a delirium (Criterion D).
Associated Features Supporting Diagnosis
A variety of medical conditions may cause catatonia, especially neurological conditions
(e.g., neoplasms, head trauma, cerebrovascular  disease, encephalitis) and metabolic con-
ditions (e.g., hypercalcemia, hepatic encepha lopathy, homocystinuria , diabetic ketoacido-
sis). The associated physical examination find ings, laboratory findings, and patterns of
prevalence and onset reflect those of  the etiological medical condition.