Coding and coverage · ICD-10-CM
F09 Unspecified mental disorder due to known physiological condition
Instructional notes
Chapter 5
Excludes2Not included here: the patient may have both; report both when both are present.
Includes
- disorders of psychological development
Section F01-F09
Notes
- This block comprises a range of mental disorders grouped together on the basis of their having in common a demonstrable etiology in cerebral disease, brain injury, or other insult leading to cerebral dysfunction. The dysfunction may be primary, as in diseases, injuries, and insults that affect the brain directly and selectively; or secondary, as in systemic diseases and disorders that attack the brain only as one of the multiple organs or systems of the body that are involved.
This code
Excludes1Not coded here: never report with this code, except when the two conditions are unrelated.
Code firstSequence the underlying condition first.
- the underlying physiological condition
Inclusion terms
- Mental disorder NOS due to known physiological condition
- Organic brain syndrome NOS
- Organic mental disorder NOS
- Organic psychosis NOS
- Symptomatic psychosis NOS
Chapter 5: Mental, Behavioral and Neurodevelopmental disorders · F01-F09 Mental disorders due to known physiological conditions (F01-F09)
Source: ICD-10-CM FY 2027 code descriptions and tabular list (CMS and CDC National Center for Health Statistics), effective 2026-10-01 through 2027-09-30 · CMS ICD-10 files. HCC mapping: CMS-HCC V28, payment year 2027. As of 2026-11-04.
Coverage and payment depend on the claim details; confirm with the Medicare Administrative Contractor.