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    OpenPayerBilling CodesSchizophrenia, schizotypal, delusional, and other non-mood psychotic disordersICD-10-CM f29-unspecified-psychosis-not-due-to-a-substance
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    ICD-10-CM Code For Unspecified Psychosis Not Due To A Substance Or Known Physiological Condition: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group F29 includes unspecified psychotic disorders characterized by psychosis symptoms such as hallucinations, delusions, or disorganized thought that are not due to substance use or a known physiological condition. These ICD-10-CM diagnosis codes are used to document clinical encounters where a definitive psychotic disorder type has not been established, capturing clinical complexity and symptom presentation. Accurate coding within the ICD-10-CM F29 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM F29: Unspecified Psychosis Not Due To A Substance Or Known Physiological Condition Overview

    The diagnoses in this group represent acute or chronic psychotic disorders characterized by symptoms such as hallucinations, delusions, disorganized thinking, or bizarre behavior not attributable to substance use or another medical condition. These codes target psychiatric conditions affecting thought content and perception and relate to mental and behavioral health rather than a specific organ system. Accurate coding matters for reimbursement because it supports appropriate claim adjudication and ensures clinical records reflect the severity and nature of psychosis for continuity of care.

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    When to Use

    Use a code from this group when a patient presents with psychosis symptoms such as hallucinations or delusions and the clinician documents that the presentation is not due to substance intoxication, withdrawal, or a known medical condition. These codes apply when the diagnosis is unspecified or provisional and no more specific psychotic disorder code is supported by the clinical record.

    ICD-10-CM Codes

    1 rows

    ICD-10-CM CodeDescription
    F29Unspecified psychosis not due to a substance or known physiological condition

    DRG Codes

    4 rows

    DRG CodeDescription
    885Psychoses
    974HIV with Major Related Condition with MCC
    975HIV with Major Related Condition with CC
    976HIV with Major Related Condition without CC/MCC

    Typical Clinical Scenarios

    • A middle-aged adult arrives at the emergency department with sudden onset of disorganized speech, fragmented thought processes, visual and auditory hallucinations, and no clear history of substance use or prior psychotic disorder. Initial medical and toxicology evaluations (including basic labs and brain imaging) do not reveal a metabolic, infectious, neurologic, or substance-related cause; the presentation is acute and the clinician documents a nonspecific psychotic syndrome pending further workup. Typical codes: F29
    • A young adult with no established psychiatric diagnosis presents to outpatient psychiatry with months of persistently odd beliefs, intermittent hallucinations, social withdrawal, and functional decline, but symptoms do not meet criteria for schizophrenia, schizoaffective disorder, or a delusional disorder and no physiological cause is identified. After longitudinal assessment and exclusion of substance- or medically-induced psychosis, the clinician records a nonspecific persistent psychotic disorder to capture the syndromic impairment. Typical codes: F29
    • An older patient with known Parkinson disease develops new visual hallucinations and disorganized behavior; neurology and primary care evaluate medication effects and metabolic causes but determine the psychotic features cannot be clearly attributed to medication adjustments or a neurocognitive disorder at that time. Because the psychosis is documented as not due to a substance or other physiological condition and lacks features diagnostic of a more specific psychotic disorder, the care team assigns a nonspecific psychosis diagnosis for management and follow-up. Typical codes: F29

    Related Codes

    F20-SCHIZOPHRENIA

    ICD-10-CM Code For Schizophrenia: Group Overview

    F21-SCHIZOTYPAL-DISORDER

    ICD-10-CM Code For Schizotypal Disorder: Group Overview

    F22-DELUSIONAL-DISORDERS

    ICD-10-CM Code For Delusional Disorders: Group Overview

    F23-BRIEF-PSYCHOTIC-DISORDER

    ICD-10-CM Code For Brief Psychotic Disorder: Group Overview

    F24-SHARED-PSYCHOTIC-DISORDER

    ICD-10-CM Code For Shared Psychotic Disorder: Group Overview

    F25-SCHIZOAFFECTIVE-DISORDERS

    ICD-10-CM Code For Schizoaffective Disorders: Group Overview

    F28-OTHER-PSYCHOTIC-DISORDER

    ICD-10-CM Code For Other Psychotic Disorder Not Due To A Substance Or Known Physiological Condition: Group Overview

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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