ICD-10-CM Diagnosis Code (2025)
Official Description for F99
Mental disorder, not otherwise specified
Coding Notes & Guidelines for F99
unspecified mental disorder due to known physiological condition (F09)
Mental illness NOS
About ICD-10-CM Code F99 (Mental disorder)
ICD-10-CM code F99 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM F99 became effective on October 1, 2024.
This page provides detailed information about F99 - Mental disorder, not otherwise specified. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Mental disorder related to not otherwise specified.