Billable / Specific Code
ICD-10-CM F09 is the diagnosis code for Unspecified mental disorder due to known physiological condition. This code falls under the section "Mental disorders due to known physiological conditions" within Chapter 5 — Mental, Behavioral and Neurodevelopmental disorders (F01-F99). It is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
The following conditions should never be coded at the same time as F09. They are mutually exclusive:
Understanding where F09 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, F09 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
F09 is the ICD-10-CM diagnosis code for "Unspecified mental disorder due to known physiological condition". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
F09 is located in Section F01-F09 — "Mental disorders due to known physiological conditions" within Chapter 5 of the ICD-10-CM Tabular List.
Use F09 when the patients documented diagnosis matches "Unspecified mental disorder due to known physiological condition" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Unspecified mental disorder due to known physiological condition is F09.
Yes, F09 can be used as a primary diagnosis code since it is billable and specific.
F09 is in Chapter 5 of the ICD-10-CM Tabular List.
Type 1 Excludes for F09 include: mild neurocognitive disorder due to known physiological condition (F06.7-); psychosis NOS (F29).
Yes, F09 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.