1. ICD-10-CM Codes
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2. F01-F99 Mental, Behavioral and Neurodevelopmental disorders
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3. F99-F99 Unspecified mental disorder
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4. F99- Mental disorder, not otherwise specified
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5. 2021 ICD-10-CM Diagnosis Code F99

2021 ICD-10-CM Diagnosis Code F99

Mental disorder, not otherwise specified

2016 2017 2018 2019 2020 2021 Billable/Specific Code

• F99 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• The 2021 edition of ICD-10-CM F99 became effective on October 1, 2020.
• This is the American ICD-10-CM version of F99 - other international versions of ICD-10 F99 may differ.

• Emotional or mental disease in mother complicating
• Mental disorder
• Mental disorder in childbirth
• Mental disorder in pregnancy
• Mental disorder in the puerperium - baby delivered
• Nonpsychotic psychological disorder after brain damage
• Psychological disorder
• Psychological disorder during pregnancy
• Psychological disorder in pregnancy
• Psychological illness, affecting pregnancy management after childbirth
• Specific nonpsychotic mental disorders following organic brain damage
• Unspecified psychological disorder

• A disorder characterized by behavioral and/or psychological abnormalities, often accompanied by physical symptoms. The symptoms may cause clinically significant distress or impairment in social and occupational areas of functioning. Representative examples include anxiety disorders, cognitive disorders, mood disorders and schizophrenia.
• Any deviation from the normal structure or function of the brain and a psychiatric condition, that results in an impairment of an individual's normal cognitive, emotional, or behavioral functioning, and is caused by physiological or psychosocial factors.
• Any of various conditions characterized by impairment of an individual's normal cognitive, emotional, or behavioral functioning, and caused by social, psychological, biochemical, genetic, or other factors, such as infection or head trauma; note behavior disorders are a subset of mental disorder.
• Conceptually broad term referring to all forms of psychopathology. Use a more specific term if possible.
• Mental disorders include a wide range of problems, including
  • anxiety disorders, including panic disorder, obsessive-compulsive disorder, post-traumatic stress disorder, and phobias
  • bipolar disorder
  • depression
  • mood disorders
  • personality disorders
  • psychotic disorders, including schizophrenia
  there are many causes of mental disorders. Your genes and family history may play a role. Your life experiences, such as stress or a history of abuse, may also matter. Biological factors can also be part of the cause. A traumatic brain injury can lead to a mental disorder. A mother's exposure to viruses or toxic chemicals while pregnant may play a part. Other factors may increase your risk, such as use of illegal drugs or having a serious medical condition like cancer.medications and counseling can help many mental disorders.
• Psychiatric illness or diseases manifested by breakdowns in the adaptational process expressed primarily as abnormalities of thought, feeling, and behavior producing either distress or impairment of function.

• 880 Acute adjustment reaction and psychosocial dysfunction

Convert F99 to ICD-9-CM

• 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
• 2017 (effective 10/1/2016): No change
• 2018 (effective 10/1/2017): No change
• 2019 (effective 10/1/2018): No change
• 2020 (effective 10/1/2019): No change
• 2021 (effective 10/1/2020): No change

• Type 1 Excludes: F29
  ICD-10-CM Diagnosis Code F29

  Unspecified psychosis not due to a substance or known physiological condition

  2016 2017 2018 2019 2020 2021 Billable/Specific Code

  Applicable To

  • Psychosis NOS
  • Unspecified schizophrenia spectrum and other psychotic disorder

  Type 1 Excludes

  • mental disorder NOS (F99)
  • unspecified mental disorder due to known physiological condition (F09)

• Aberration
  • mental F99
• Disease, diseased - see also Syndrome
  • mental F99
  • psychiatric F99
• Disorder (of) - see also Disease
  • mental (or behavioral) (nonpsychotic) F99
  • psychological F99
• Disturbance(s) - see also Disease
  • mental F99
• Problem (with) (related to)
  • psychiatric F99
• Psychiatric disorder or problem F99
• Reaction - see also Disorder
  • psychogenic F99
• Situation, psychiatric F99

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