2026 ICD-10-CM Diagnosis Code F20.3Undifferentiated schizophrenia
ICD-10-CM Codes›F01–F99›F20-F29›F20
- Billable — Valid for Submission
- Chronic Condition
F20.3 is a billable ICD-10-CM diagnosis code for undifferentiated schizophrenia. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as chronic undifferentiated schizophrenia. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Schizophrenia spectrum and other psychotic disorders.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- 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
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Atypical schizophrenia
Type 1 Excludes
- acute schizophrenia-like psychotic disorder F23
Type 2 Excludes
- post-schizophrenic depression F32.89
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Schizophrenia, schizophrenic - F20.9
- atypical (form) - F20.3
- undifferentiated (type) - F20.3
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Schizophrenia, schizophrenic
- atypical (form)
- Schizophrenia, schizophrenic
- undifferentiated (type)
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Schizophrenia
a severe emotional disorder of psychotic depth characteristically marked by a retreat from reality with delusion formation, hallucinations, emotional disharmony, and regressive behavior.Schizophrenia Spectrum and Other Psychotic Disorders
marked disorders of thought (delusions, hallucinations, or other thought disorder accompanied by disordered affect or behavior), and deterioration from a previous level of functioning. individuals have one o more of the following symptoms: delusions, hallucinations, and disorganized speech. (from dsm-5)Schizophrenia, Catatonic
a type of schizophrenia characterized by abnormality of motor behavior which may involve particular forms of stupor, rigidity, excitement or inappropriate posture.Schizophrenia, Childhood
an obsolete concept, historically used for childhood mental disorders thought to be a form of schizophrenia. it was in earlier versions of dsm but is now included within the broad concept of pervasive development disorders.Schizophrenia, Disorganized
a type of schizophrenia characterized by frequent incoherence; marked loosening of associations, or grossly disorganized behavior and flat or grossly inappropriate affect that does not meet the criteria for the catatonic type; associated features include extreme social withdrawal, grimacing, mannerisms, mirror gazing, inappropriate giggling, and other odd behavior. (dorland, 27th ed)Schizophrenia, Paranoid
a chronic form of schizophrenia characterized primarily by the presence of persecutory or grandiose delusions, often associated with hallucination.Schizophrenia, Treatment-Resistant
a subset of schizophrenia with an inadequate response in target symptoms following treatment with two or more antipsychotics.Schizotypal Personality Disorder
a personality disorder in which there are oddities of thought (magical thinking, paranoid ideation, suspiciousness), perception (illusions, depersonalization), speech (digressive, vague, overelaborate), and behavior (inappropriate affect in social interactions, frequently social isolation) that are not severe enough to characterize schizophrenia.Hallucinations
subjectively experienced sensations in the absence of an appropriate stimulus, but which are regarded by the individual as real. they may be of organic origin or associated with mental disorders.
Patient EducationClinical
Schizophrenia
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.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert F20.3 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About F20.3Overview
Is F20.3 (Schizophrenia) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report undifferentiated schizophrenia on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What is the ICD-9 equivalent of F20.3?
Under the General Equivalence Mappings, undifferentiated schizophrenia converts to ICD-9-CM 295.90 (schizophrenia NOS-unspec). The mapping is approximate, so confirm the match fits the documentation.
Footnotes
[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:
- The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
- The condition places limitations on self-care, independent living, and social interactions.
