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ICD-10-CM Code F99
Mental disorder, not otherwise specified

BILLABLE
Billable Code
Billable codes are sufficient justification for admission to an acute care hospital when used a principal diagnosis.
Mental Health
Mental Health Code
Indicates that the ICD code is referenced in DSM-5 (Diagnostic and Statistical Manual of Mental Disorders, Version 5)
| ICD-10 from 2011 - 2016

F99 is a billable ICD code used to specify a diagnosis of mental disorder, not otherwise specified. A 'billable code' is detailed enough to be used to specify a medical diagnosis.


The ICD code F99 is used to code Mental disorder

A mental disorder, also called a mental illness, psychological disorder or psychiatric disorder, is mental or behavioral pattern that causes either suffering or a poor ability to function in ordinary life. Such features may be persistent, relapsing and remitting, or occur as a single episode. Many disorders have been described, with signs and symptoms that vary widely between specific disorders. Typically, social norms and religious or cultural beliefs are excluded.

Specialty: Psychiatry
MeSH Codes: D001523, D001523
ICD 9 Codes: 290, 319

Eight women representing prominent mental diagnoses in the 19th century at the Salpêtrière (Paris). (fr. Armand Gautier)

Source: Wikipedia

Coding Notes for F99 Info for medical coders on how to properly use this ICD-10 code

Inclusion Terms:
Inclusion Terms
Inclusion Terms are a list of concepts for which a specific code is used. The list of Inclusion Terms is useful for determining the correct code in some cases, but the list is not necessarily exhaustive.
Mental illness NOS
Code Type-1 Excludes:
Type-1 Excludes
Type-1 Excludes mean the conditions excluded are mutually exclusive and should never be coded together. Excludes 1 means "do not code here."
Unspecified mental disorder due to known physiological condition - instead, use Code F09

MS-DRG Mapping

  • DRG Group #880 - Acute adjustment reaction and psychosocial dysfunction.

Related Concepts SNOMET-CT

  • Indication for modification of patient psychological status (disorder)

Coding Advice SNOMET-CT

  • Consider additional code to identify specific condition or disease

ICD-10-CM Alphabetical Index References for 'F99 - Mental disorder, not otherwise specified'

The ICD-10-CM Alphabetical Index links the below-listed medical terms to the ICD code F99. Click on any term below to browse the alphabetical index.

Situation, psychiatric (F99)
Psychiatric disorder or problem (F99)

Equivalent ICD-9 Code GENERAL EQUIVALENCE MAPPINGS (GEM)

Unspecified nonpsychotic mental disorder (approximate match)

This is the official approximate match mapping between ICD9 and ICD10, as provided by the General Equivalency mapping crosswalk. This means that while there is no exact mapping between this ICD10 code F99 and a single ICD9 code, 300.9 is an approximate match for comparison and conversion purposes.


** This Document Provided By ICD.Codes **
Source: http://icd.codes/icd10cm/F99