ICD-10-CM 2027
ICD-10 code for Confusional insanity
Other psychotic disorder not due to a substance or known physiological condition
From the official ICD-10-CM alphabetic index entry “Insanity, insane › confusional”. Page updated September 29, 2026.
About coding Confusional insanity
The ICD-10-CM code for Confusional insanity is F28 (Other psychotic disorder not due to a substance or known physiological condition). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on F28.
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 885 (Psychoses, relative weight 1.3901), DRG 974 (HIV with Major Related Condition with MCC, relative weight 3.0506), DRG 975 (HIV with Major Related Condition with CC, relative weight 1.3252) and DRG 976 (HIV with Major Related Condition without CC/MCC, relative weight 0.8124), in MDC 19 (Mental Diseases and Disorders) and MDC 25 (Human Immunodeficiency Virus Infections), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
More specific Confusional insanity codes (official index)
- acute or subacute F05 — Delirium due to known physiological condition
Common questions about Confusional insanity ICD-10 codes
What is the ICD-10 code for Confusional insanity?
- F28 — Other psychotic disorder not due to a substance or known physiological condition. More specific codes apply when the documentation supports them: F05.
What is the ICD-10 code for acute or subacute confusional insanity?
- F05 — Delirium due to known physiological condition.
Is F28 billable?
- Yes. F28 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can F28 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict F28 as a principal diagnosis.
Is F28 a CC or MCC?
- No. F28 is neither a CC nor an MCC under MS-DRG v44.0.