ICD-10-CM 2027
ICD-10 code for brain nonpsychotic syndrome
From the official ICD-10-CM alphabetic index entry “Syndrome › brain (nonpsychotic)”. Page updated September 29, 2026.
About coding brain nonpsychotic syndrome
The ICD-10-CM code for brain nonpsychotic syndrome is F09 (Unspecified mental disorder due to known physiological condition). The official index lists 9 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on F09.
Don't report F09 together with the conditions in its Excludes1 note: mild neurocognitive disorder due to known physiological condition (F06.7-) and psychosis NOS (F29).
Code first: the underlying physiological condition.
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
More specific brain nonpsychotic syndrome codes (official index)
- with psychosis, psychotic reaction F09 — Unspecified mental disorder due to known physiological condition
- acute or subacute
- congenital
- organic F09 — Unspecified mental disorder due to known physiological condition
- post-traumatic (nonpsychotic) F07.81 — Postconcussional syndrome
- psychotic F09 — Unspecified mental disorder due to known physiological condition
- personality change F07.0 — Personality change due to known physiological condition
- postcontusional F07.81 — Postconcussional syndrome
- post-traumatic, nonpsychotic F07.81 — Postconcussional syndrome
- psycho-organic F09 — Unspecified mental disorder due to known physiological condition
- psychotic F06.8 — Other specified mental disorders due to known physiological condition
Don't confuse with (Excludes1 for F09)
Common questions about brain nonpsychotic syndrome ICD-10 codes
What is the ICD-10 code for brain nonpsychotic syndrome?
- F09 — Unspecified mental disorder due to known physiological condition. More specific codes apply when the documentation supports them: F09, F09, F07.81, F09 and others below.
What is the ICD-10 code for organic brain nonpsychotic syndrome?
- F09 — Unspecified mental disorder due to known physiological condition.
What is the ICD-10 code for personality change brain nonpsychotic syndrome?
- F07.0 — Personality change due to known physiological condition.
What is the ICD-10 code for postcontusional brain nonpsychotic syndrome?
- F07.81 — Postconcussional syndrome.
What is the ICD-10 code for psycho-organic brain nonpsychotic syndrome?
- F09 — Unspecified mental disorder due to known physiological condition.
What is the ICD-10 code for psychotic brain nonpsychotic syndrome?
- F06.8 — Other specified mental disorders due to known physiological condition.
Is F09 billable?
- Yes. F09 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can F09 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict F09 as a principal diagnosis.
Is F09 a CC or MCC?
- No. F09 is neither a CC nor an MCC under MS-DRG v44.0.