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F09

Billable

Unspecified mental disorder due to known physiological condition

F09 is the ICD-10-CM code for Unspecified mental disorder due to known physiological condition. It is a billable, specific code valid for reimbursement.

Status
Billable
Chapter
F01-F99
Edition
FY2026

F01-F99 Mental, Behavioral and Neurodevelopmental disorders

Includes

  • •Mental disorder NOS due to known physiological condition
  • •Organic brain syndrome NOS
  • •Organic mental disorder NOS
  • •Organic psychosis NOS
  • •Symptomatic psychosis NOS

Excludes1 — not coded here

  • •mild neurocognitive disorder due to known physiological condition (F06.7-)
  • •psychosis NOS (F29)

Code first

  • •the underlying physiological condition

Frequently asked questions

What is ICD-10 code F09?
F09 is the ICD-10-CM code for "Unspecified mental disorder due to known physiological condition". It falls under F01-F99 Mental, Behavioral and Neurodevelopmental disorders.
Is F09 a billable code?
Yes — F09 is a billable, specific ICD-10-CM code valid for reimbursement.
What is excluded from F09?
Excludes1 (not coded here): mild neurocognitive disorder due to known physiological condition (F06.7-); psychosis NOS (F29).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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