2018/2019 ICD-10-CM Diagnosis Code F99

Mental disorder, not otherwise specified

Applicable To
  • Mental illness NOS
Type 1 Excludes
Type 1 Excludes Help
A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as F99. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • unspecified mental disorder due to known physiological condition (
    ICD-10-CM Diagnosis Code F09

    Unspecified mental disorder due to known physiological condition

      2016 2017 2018 2019 Billable/Specific Code
    Applicable To
    • Mental disorder NOS due to known physiological condition
    • Organic brain syndrome NOS
    • Organic mental disorder NOS
    • Organic psychosis NOS
    • Symptomatic psychosis NOS
    Code First
    • the underlying physiological condition
    Type 1 Excludes
    • psychosis NOS (F29)
    F09
    )
The following code(s) above F99 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to F99:
  • F01-F99
    2019 ICD-10-CM Range F01-F99

    Mental, Behavioral and Neurodevelopmental disorders

    Includes
    • disorders of psychological development
    Type 2 Excludes
    • symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)
    Mental, Behavioral and Neurodevelopmental disorders
Approximate Synonyms Clinical Information ICD-10-CM F99 is grouped within Diagnostic Related Group(s) (MS-DRG v36.0):

Convert F99 to ICD-9-CM

Code History
Code annotations containing back-references to F99:

Diagnosis Index entries containing back-references to F99:

ICD-10-CM Codes Adjacent To F99
F98.0 Enuresis not due to a substance or known physiological condition
F98.1 Encopresis not due to a substance or known physiological condition
F98.2 Other feeding disorders of infancy and childhood
F98.21 Rumination disorder of infancy
F98.29 Other feeding disorders of infancy and early childhood
F98.3 Pica of infancy and childhood
F98.4 Stereotyped movement disorders
F98.5 Adult onset fluency disorder
F98.8 Other specified behavioral and emotional disorders with onset usually occurring in childhood and adolescence
F98.9 Unspecified behavioral and emotional disorders with onset usually occurring in childhood and adolescence
F99 Mental disorder, not otherwise specified
G00 Bacterial meningitis, not elsewhere classified
G00.0 Hemophilus meningitis
G00.1 Pneumococcal meningitis
G00.2 Streptococcal meningitis
G00.3 Staphylococcal meningitis
G00.8 Other bacterial meningitis
G00.9 Bacterial meningitis, unspecified
G01 Meningitis in bacterial diseases classified elsewhere
G02 Meningitis in other infectious and parasitic diseases classified elsewhere
G03 Meningitis due to other and unspecified causes

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.