Unspecified psychosis not due to a substance or known physiological condition (F29)
The ICD-10 code F29 is used to classify unspecified psychosis that is not caused by substances or identifiable physiological conditions. This code applies when a psychotic disorder is present but does not fit into more specific categories of schizophrenia or other psychotic disorders.
F29 covers a range of conditions often described as non-organic psychosis or atypical psychosis. It includes symptoms such as positive and negative psychotic features, cognitive impairments, and psychomotor disturbances that do not clearly link to substance use or medical causes. This code is especially useful in cases where psychotic symptoms arise during pregnancy, childbirth, or the puerperium, known also by terms like psychotic disorder in mother complicating childbirth or mental disorder in mother complicating pregnancy. For medical coders and healthcare professionals, using F29 helps to capture a psychotic disorder diagnosis when evaluation does not specify a defined psychotic disorder, assisting in accurately documenting and tracking these complex mental health conditions under the schizophrenia spectrum umbrella. This makes F29 the go-to ICD-10 code for unspecified psychosis without clear physiological or substance-related causes.
Mental and behavioural disorders (F01–F99)
Schizophrenia, schizotypal, delusional, and other non-mood psychotic disorders (F20-F29)
- F29 Unspecified psychosis not due to a substance or known physiological condition
Unspecified psychosis not due to a substance or known physiological condition (F29)
Instructional Notations
Inclusion Terms
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.
- Psychosis NOS
- Unspecified schizophrenia spectrum and other psychotic disorder
Type 1 Excludes
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.
Clinical Terms
The following clinical terms provide additional context, helping users better understand the clinical background and common associations for each diagnosis listed in this section. Including related terms alongside ICD-10-CM codes supports coders, billers, and healthcare professionals in improving accuracy, enhancing documentation, and facilitating research or patient education.
Negativism
State of mind or behavior characterized by extreme skepticism and persistent opposition or resistance to outside suggestions or advice. (APA, Thesaurus of Psychological Index Terms, 1994)
