F24 ICD-10-CM Code: Shared psychotic disorder
F24 maps to CMS-HCC V28 152. A source-labeled RAF reference is available. Confirm the documented diagnosis and applicable coding requirements. MEAT criteria · RAF Calculator · free HCC coding tools
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FY 2026 Apr update / Mental, Behavioral and Neurodevelopmental disorders (F01-F99) / Schizophrenia, schizotypal, delusional, and other non-mood psychotic disorders (F20-F29)
F24
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceShared psychotic disorder
A rare condition where delusional beliefs are transmitted from one individual to another, typically occurring in people who are closely related or live together.
Buddy Insight
Shared psychotic disorder (folie a deux) is a rare condition where delusional beliefs are transmitted from a person with a primary psychotic disorder to a closely associated individual.
CMS-HCC V28
MappedHCC 152
Coefficient HCC 152: 0.484 (Community Non-Dual Aged (CNA))
CMS-HCC V24
HistoricalHistorical
Not used for CY2026 payment
ACA/HHS
Context neededHCC 087_2
Coefficient needs member context
ESRD/PACE
Context neededHCC 59
Coefficient needs member context
RXHCC
MappedHCC 133
Code-level coefficient reference
Code Book Path
Inclusion Terms
Official- Folie à deux
- Induced paranoid disorder
- Induced psychotic disorder
Excludes 2
Official- symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)Inherited from F01-F99
Related Codes
No related codes are included in this display for F24. Check the Code Book for the complete code path.
Includes
Official- disorders of psychological developmentInherited from F01-F99
Excludes 1
OfficialNo Excludes 1 notes are included in this display for F24. Check the code and parent instructions in the Code Book.
Code First
OfficialNo Code First sequencing instructions are included in this display for F24. Check the code and parent instructions in the Code Book.
Use Additional
OfficialNo Use Additional Code instructions are included in this display for F24. Check the code and parent instructions in the Code Book.
Code Also
OfficialNo Code Also instructions are included in this display for F24. Check the code and parent instructions in the Code Book.
Buddy Documentation Tip
MEAT Support
Audit Caution
Common Mistakes
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
Is F24 an HCC code?
Yes. F24 (Shared psychotic disorder) maps to HCC 152, Psychosis, Except Schizophrenia under the CMS-HCC V28 risk adjustment model, with a source-labeled community non-dual aged reference coefficient of 0.484. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes. It is billable for payment year 2026.
Coder answer: F24 is billable and maps to V28 HCC 152, Psychosis, Except Schizophrenia. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.
- Code
- F24
- Description
- Shared psychotic disorder
- HCC (V28)
- HCC 152 — Psychosis, Except Schizophrenia
- RAF reference coefficient
- 0.484
- Billable
- Yes
- Payment year
- 2026
HCC Category Mapping
These are source-labeled model coefficients, not member totals. A category may still be removed by hierarchy or model cleanup rules. Weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member context, hierarchy and cleanup rules, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains available for historical review.
Work F24 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →
MEAT review for F24
For F24, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule.
- MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
- EEvaluate: test results, medication response, or physical findings reviewed by the provider
- AAssess: explicit mention in the assessment or plan with acknowledgment of status
- TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis
Coder workflow notes
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What This Code Means
F24 is the ICD-10-CM diagnosis code for shared psychotic disorder. A rare condition where delusional beliefs are transmitted from one individual to another, typically occurring in people who are closely related or live together. F24 sits in the ICD-10-CM chapter for mental, behavioral and neurodevelopmental disorders (f01-f99), within the section covering schizophrenia, schizotypal, delusional, and other non-mood psychotic disorders (f20-f29).
Under the CMS-HCC V28 risk adjustment model, F24 maps to Psychosis, Except Schizophrenia (HCC 152) with a source-labeled community, non-dual, aged reference coefficient of 0.484. For CY2026 non-PACE Medicare Advantage, CMS uses 100% of the 2024 CMS-HCC model (V28). PACE uses a separate model blend. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes.
Both the primary and secondary cases should be coded; document the relationship between affected individuals. For F24, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for F24 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Both the primary and secondary cases should be coded; document the relationship between affected individuals
- •Ensure documentation clearly identifies which person has the primary psychotic disorder
Clinical Significance
Shared psychotic disorder (folie a deux) is a rare condition where delusional beliefs are transmitted from a person with a primary psychotic disorder to a closely associated individual. The secondary case typically would not have developed psychosis independently. This condition requires identification and treatment of both the primary and secondary cases. Accurate coding captures the psychiatric complexity and ensures appropriate risk adjustment for both patients involved.
Documentation Requirements
- ✓Documented identification of both the primary case (person with original psychotic disorder) and the secondary case
- ✓Description of the shared delusional content
- ✓Documentation of the close relationship between the affected individuals (family members, cohabitants)
- ✓Assessment confirming the secondary case would not have developed the delusion independently
- ✓Treatment plan including separation from the primary case and individual psychiatric treatment
- ✓Assessment of whether the shared delusions persist after separation
Commonly Confused Codes
- •F22: Delusional disorder for the PRIMARY case rather than the shared/secondary case
- •F20.0: Paranoid schizophrenia should be used for the primary case if they have full schizophrenia
- •F29: Unspecified psychosis should not be used when the shared psychotic dynamic is documented
- •F23: Brief psychotic disorder may apply if the secondary case's symptoms resolve quickly after separation
- •F68.10: Factitious disorder should be ruled out in the secondary case