ICD-10 Diagnosis Code F20.3

Undifferentiated schizophrenia

Diagnosis Code F20.3

ICD-10: F20.3
Short Description: Undifferentiated schizophrenia
Long Description: Undifferentiated schizophrenia
This is the 2017 version of the ICD-10-CM diagnosis code F20.3

Code Classification
  • Mental and behavioural disorders
    • Schizophrenia, schizotypal, delusional, and other non-mood psychotic disorders (F20-F29)
      • Schizophrenia (F20)

Information for Medical Professionals

Convert to ICD-9 Additional informationCallout TooltipGeneral Equivalence Map
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.

  • Chronic undifferentiated schizophrenia
  • Chronic undifferentiated schizophrenia with acute exacerbations
  • Schizophrenia in remission
  • Subchronic schizophrenia with acute exacerbations
  • Subchronic undifferentiated schizophrenia
  • Subchronic undifferentiated schizophrenia with acute exacerbations
  • Undifferentiated schizophrenia
  • Undifferentiated schizophrenia in remission

Index of Diseases and Injuries
References found for the code F20.3 in the Index of Diseases and Injuries:

Information for Patients


Schizophrenia is a serious brain illness. People who have it may hear voices that aren't there. They may think other people are trying to hurt them. Sometimes they don't make sense when they talk. The disorder makes it hard for them to keep a job or take care of themselves.

Symptoms of schizophrenia usually start between ages 16 and 30. Men often develop symptoms at a younger age than women. People usually do not get schizophrenia after age 45. There are three types of symptoms:

  • Psychotic symptoms distort a person's thinking. These include hallucinations (hearing or seeing things that are not there), delusions (beliefs that are not true), trouble organizing thoughts, and strange movements.
  • "Negative" symptoms make it difficult to show emotions and to function normally. A person may seem depressed and withdrawn.
  • Cognitive symptoms affect the thought process. These include trouble using information, making decisions, and paying attention.

No one is sure what causes schizophrenia. Your genes, environment, and brain chemistry may play a role.

There is no cure. Medicine can help control many of the symptoms. You may need to try different medicines to see which works best. You should stay on your medicine for as long as your doctor recommends. Additional treatments can help you deal with your illness from day to day. These include therapy, family education, rehabilitation, and skills training.

NIH: National Institute of Mental Health

  • Mental status testing
  • Schizoaffective disorder
  • Schizophrenia

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