F99 MENTAL DISORDER, NOT OTHERWISE SPECIFIED

Code Information

  • Diagnosis Code: F99
  • Short Description: Mental disorder, not otherwise specified
  • Long Description: Mental disorder, not otherwise specified
  • Code Version: 2025 ICD-10-CM

The code F99 is VALID for claim submission

Code Classification

Synonyms

  • Axis I diagnosis
  • Axis II diagnosis
  • Axis II diagnosis
  • Axis III diagnosis
  • Axis IV diagnosis
  • Axis V diagnosis
  • Brain fag
  • Cheshire cat syndrome
  • Chronic mental disorder
  • Deferred diagnosis on Axis II
  • Deferred diagnosis on Axis III
  • Female athlete triad
  • Ghost sickness
  • Hypersomnia disorder related to another mental disorder
  • Identity disorder
  • Impairment of psychological status
  • Indication for modification of patient physical status
  • Indication for modification of patient psychological status
  • Indication for modification of patient status
  • Indication for modification of patient status
  • Insomnia disorder related to another mental disorder
  • Mental disorder
  • Mental disorder AND/OR culture bound syndrome
  • Mental disorder during puerperium
  • Mental disorder in infancy
  • Mental disorder in mother complicating childbirth
  • Mental disorder in mother complicating pregnancy
  • Mental disorders during pregnancy, childbirth and the puerperium
  • Mental disorders during pregnancy, childbirth and the puerperium
  • On severe mental illness register
  • Pregnancy with mental disorders
  • Psychiatric behavioral disability
  • Psychiatric treatment changed
  • Psychiatric treatment started
  • Psychological disorder during pregnancy
  • Root work
  • Suspicion

References to Index of Diseases and Injuries

The code F99 has the following ICD-10-CM references to the Index of Diseases and Injuries

  • Inclusion Terms:
    • Mental illness NOS
  • Type 1 Excludes Notes:
    • unspecified mental disorder due to known physiological condition (@F09*)

Crosswalk Information

ICD-10 Code ICD-9 Code ICD-9 Description
F99 Right Arrow 300.9 Nonpsychotic disord NOS
This ICD-10 to ICD-9 data is based on the 2018 General Equivalency Mapping (GEM) files published by the Centers for Medicare & Medicaid Services (CMS) for informational purposes only. The data is not an ICD-10 conversion tool and doesn’t guarantee clinical accuracy.

Similar Codes

ICD-10 Code ICD-10 Description
This page was last updated on: 10/1/2024
Previous Code
Next Code