ICD-10 code F22: Delusional disorders billing and documentation guide

Key Takeaways

ICD-10 code F22 is a billable ICD-10-CM diagnosis code for delusional disorders, valid for adult diagnoses and billable since 2016.

F22 requires documentation of one or more persistent non-bizarre delusions lasting at least one month, per DSM-5-TR criteria.

Paranoid personality disorder (F60.0) carries an Excludes2 note under F22, meaning both codes can be reported together when clinically justified.

F22 also carries an Excludes1 note for paranoid schizophrenia (F20.0) and mood disorders with psychotic symptoms (F30.2, F31.2, F31.5, F31.64, F32.3, F33.3), which can never be coded with F22 on the same claim.

Pabau’s claims management software helps psychiatric and mental health practices submit F22 claims accurately and track documentation requirements across the patient record.

ICD-10 code F22 is a billable ICD-10-CM code for delusional disorders, defined by one or more non-bizarre delusions with few other signs of psychotic or personality disturbance. Documentation must distinguish F22 from paranoid schizophrenia (F20.0) and brief psychotic disorder (F23), since the diagnostic scope is narrow and the three codes are frequently confused.

This guide covers F22’s definition, DSM-5-TR alignment, excludes notes, MS-DRG mappings, and the documentation standards that support medical necessity for psychiatric coders, mental health clinicians, and practice managers.

ICD-10 code F22: Definition and clinical overview

ICD-10 code F22 describes delusional disorders characterized by psychotic behavior accompanied by persecutory or grandiose delusions, with few other signs of personality or thought disturbance. The code is maintained by the World Health Organization under ICD-10 and adopted into the U.S. ICD-10-CM system by the Centers for Medicare and Medicaid Services (CMS) and the National Center for Health Statistics (NCHS).

F22 sits within Chapter 5: Mental, Behavioral and Neurodevelopmental disorders (F01-F99), under the block F20-F29: Schizophrenia, schizotypal, delusional, and other non-mood psychotic disorders. It has been a valid, billable code since 2016 and remains active for fiscal year 2026.

For emergency department encounters where delusional disorder may first present, the CPT code 99283 emergency department visit guide covers the evaluation and management billing considerations that often accompany initial psychiatric assessments.

The code captures conditions indexed under it, including delusional dysmorphophobia and fixed delusions about bodily functions or shape. These presentations, sometimes encountered in dermatology or plastic surgery referrals, appropriately map to F22 rather than somatic symptom disorder codes when the belief meets the full delusional threshold.

Practices providing home-based psychiatric services should also review the CPT code 99345 home visit billing guide for new patients presenting with delusional symptoms in non-clinical settings.

• Code: F22
• Full description: Delusional disorders
• Chapter: Chapter 5, F01-F99 (Mental, Behavioral and Neurodevelopmental disorders)
• Block: F20-F29 (Schizophrenia, schizotypal, delusional, and other non-mood psychotic disorders)
• Status: Billable/Specific Code, valid for adult diagnoses
• Billable since: 2016
• ICD-9-CM crosswalk: 297.1 (Delusional disorder)

Practices evaluating behavioral health practice management software should confirm the platform supports F22-level code specificity, since capturing the delusional disorder distinction accurately is critical to claims acceptance. Misclassification to F20.0 or F23 triggers medical necessity reviews and, in many cases, automatic denials from commercial payers.

Practices that also bill for medical team conferences when coordinating complex delusional disorder care can reference the CPT Code 99366 medical team conference billing guide.

F22 code hierarchy and related codes

Understanding where F22 sits within the broader psychotic disorder code range helps coders select the most specific code and avoid common sequencing errors. The table below maps F22 against the most frequently confused neighboring codes, including which relationships are governed by Excludes1 or Excludes2 notes.

Mental health practices using structured client records can map each differential diagnosis to its own encounter note, creating a clear audit trail when payers question code specificity. Practices also coordinating preventive counseling alongside psychiatric care may find the CPT Code 99404 preventive medicine counseling billing guide useful for 60-minute sessions that include psychoeducation.

Diagnostic criteria and DSM-5-TR alignment for F22

ICD-10 code F22 corresponds to Delusional Disorder in the DSM-5-TR. The alignment matters for billing: payers increasingly require that diagnostic codes map to a recognized diagnostic framework, and the DSM-5-TR provides the clinical anchoring documentation that supports F22 claims.

According to DSM-5-TR criteria, a diagnosis of delusional disorder requires:

• The presence of one or more delusions lasting one month or longer
• Criterion A for schizophrenia has never been met (rules out F20.0)
• Functioning is not markedly impaired apart from the direct impact of the delusion
• If mood episodes have occurred, they are brief relative to the total duration of the delusional periods
• The disturbance is not attributable to a substance, medication, or another medical condition

The bizarre vs. non-bizarre delusion distinction carries coding implications. Non-bizarre delusions (plausible scenarios such as being followed, poisoned, or having an illness) are the hallmark of F22. Bizarre delusions (physically impossible scenarios such as organs being removed without surgery) suggest schizophrenia and typically point toward F20.0 instead.

F22 delusional disorder subtypes

The DSM-5-TR recognizes several subtypes, all coded under F22 in ICD-10-CM. Clinicians should document the specific subtype in the clinical note to strengthen medical necessity:

• Erotomanic: Belief that another person, often of higher status, is in love with the patient
• Grandiose: Belief of inflated worth, power, knowledge, identity, or special relationship
• Jealous: Belief that one’s partner is unfaithful, based on delusional evidence
• Persecutory: Belief that the person (or someone close) is being maltreated, spied on, or conspired against
• Somatic: Belief that the individual has a physical defect or medical condition
• Mixed: No single delusional theme predominates
• Unspecified: Predominant delusional theme cannot be clearly determined

Practices providing mental health EMR services benefit from intake and progress note templates that prompt clinicians to document subtype, onset date, and functional impact. This documentation directly supports payer medical necessity reviews for F22 claims.

Excludes notes and coding rules for F22

The ICD-10-CM tabular list carries two different excludes notes under F22, and confusing the two is one of the most commonly misunderstood coding rules in the F20-F29 block.

An Excludes1 note under F22 lists paranoid schizophrenia (F20.0) and mood [affective] disorders with psychotic symptoms: F30.2, F31.2, F31.5, F31.64, F32.3, and F33.3. Excludes1 is an absolute exclusion — these codes can never be reported together with F22 on the same claim, because ICD-10-CM treats them as mutually exclusive conditions.

An Excludes2 note under F22 lists paranoid personality disorder (F60.0), along with paranoid psychosis, psychogenic paranoid psychosis, and paranoid reaction, which are classified to F23 rather than F22.

An Excludes2 note does not prohibit coding both conditions together: it signals only that the excluded condition is not part of F22, so F22 and the Excludes2-listed condition may be reported on the same claim when clinical documentation independently supports each diagnosis.

F22 vs. F20.0: Paranoid schizophrenia coding difference

The distinction between F22 and F20.0 is the most frequent coding confusion in this block. Both involve paranoid or persecutory content, but the clinical differentiators are clear:

• F22: Delusions are non-bizarre; hallucinations absent or minimal; personality largely preserved; functioning intact outside the delusional system
• F20.0: Hallucinations are prominent (especially auditory); formal thought disorder may be present; negative symptoms (flat affect, alogia, avolition) possible; significant functional impairment

F20.0 carries an Excludes1 note under F22, so the two codes can never be reported together on the same claim. Coders must choose one based on the documented clinical picture rather than listing both as co-occurring diagnoses.

Coding F20.0 when F22 is clinically appropriate (or vice versa) creates audit exposure. Payers use MS-DRG groupings partly to benchmark expected inpatient stays, and misclassification between these two codes can result in claim adjustments in both directions.

When to use F22 vs. F23

The duration criterion is the primary differentiator between F22 and F23 (brief psychotic disorder). F23 applies when symptoms have been present for at least one day but fewer than one month, with eventual full return to premorbid functioning. Once symptoms persist beyond one month without meeting schizophrenia criteria, F22 becomes the appropriate code.

Practices that track psychotic disorder coding across patient populations benefit from review workflows that flag encounters where a provisional F23 code may need updating to F22 once the one-month threshold passes. For psychiatric crisis billing, see the guide on CPT Code 90839: Psychotherapy for crisis, which frequently pairs with F22 in acute presentations.

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MS-DRG groupings and F22 billing guidance

Under the current MS-DRG version, ICD-10 code F22 maps to MS-DRG 885 (Psychoses), a single-tier DRG with no CC/MCC severity split. Inpatient psychiatric facilities and acute care hospitals billing for delusional disorder admissions should confirm current MS-DRG assignments using the CMS MS-DRG Classifications and Software page to validate the specific grouper version in use for the fiscal year.

For outpatient and office-based settings, F22 functions as the principal diagnosis or as a secondary diagnosis accompanying a therapeutic service CPT code. Common pairings include:

• CPT 90837 (individual psychotherapy, 60 minutes) + F22 as primary diagnosis
• CPT 90834 (individual psychotherapy, 45 minutes) + F22
• CPT 99213 or 99214 (established patient office visit) + F22 when medication management is the primary service
• CPT 90792 (psychiatric diagnostic evaluation with medical services) + F22 at initial presentation

Prior authorization requirements for F22-coded services vary by payer. Commercial insurers frequently require a clinical justification letter for ongoing antipsychotic medication management billed alongside F22, particularly for newer atypical agents. Practices using claims management software can configure authorization tracking flags at the patient level to prevent inadvertent billing without required approvals.

For intensive outpatient program billing that often follows an F22 admission, see the guide on HCPCS Code S9480: Intensive outpatient psychiatric services, per diem. For inpatient nursing facility follow-up billing after psychiatric admission, see CPT Code 99310 nursing facility billing overview.

ICD-9-CM crosswalk: F22 to 297.1

For legacy data reconciliation or value-based care analytics projects requiring historical coding comparison, F22 crosswalks to ICD-9-CM code 297.1 (Delusional disorder). The crosswalk is approximate: the ICD-9-CM classification grouped paranoid states more broadly than the current ICD-10-CM specificity allows. When comparing pre-2016 and post-2016 patient cohorts, this distinction affects prevalence calculations and longitudinal reporting.

The AAPC Codify ICD-10-CM lookup provides bidirectional crosswalk functionality for practices needing to map historical ICD-9 codes to their current ICD-10-CM equivalents. For chronic care coordination billing that often accompanies long-term psychiatric treatment, see the guide on CPT Code 99490: Chronic care management billing.

Documentation requirements for F22 claims

Medical necessity documentation for ICD-10 code F22 must establish four elements to withstand payer review. Missing any one of them is the primary reason F22 claims are returned or denied on audit.

• Duration: The clinical note must establish that delusions have been present for at least one month. A single encounter note with no reference to onset or prior history is insufficient.
• Nature of delusions: The note must document that delusions are non-bizarre (within the realm of possible human experience). Clinicians should describe the specific belief content, not just label it “persecutory” or “somatic.”
• Preserved functioning: Document that the patient’s general functioning outside the delusional system is not markedly impaired. This distinguishes F22 from schizophrenia diagnoses where global impairment is expected.
• Rule-out of other causes: Note that the presentation is not attributable to substance use, another primary psychiatric disorder with psychotic features (such as bipolar disorder with psychotic features), or a general medical condition — the category of codes that includes ICD-10 Code F04 for psychiatric symptoms due to a known physiological condition.

Practices using digital clinical forms can embed these four documentation prompts directly into the psychiatric progress note template, and a ready-made family genogram template can further support documenting psychiatric history context, ensuring clinicians address each criterion at every relevant encounter without adding significant documentation burden.

Practical workflow for accurate F22 coding

A repeatable coding workflow reduces denial rates for F22 claims across practice settings:

1. At initial presentation: Code F23 provisionally if symptoms have not yet reached the one-month threshold. Flag the encounter for follow-up review.
2. At the one-month mark: Review the clinical note for DSM-5-TR criterion documentation. If met, update to F22 for all subsequent claims. Update the problem list in the patient record.
3. At each medication management visit: Document ongoing delusion presence, subtype, and functional status. This creates the longitudinal record payers require for continued authorization.
4. Before claims submission: Confirm the CPT-diagnosis pairing is appropriate. Use the adolescent intake questionnaire for mental health or a structured psychiatric evaluation framework to verify documentation completeness.
5. On denial: Pull the original clinical note. If the four documentation elements above are present, appeal with a copy of the note and a one-paragraph clinical justification letter from the treating clinician.

For practices seeing patients with co-occurring diagnoses, the guidance on Autism Spectrum Quotient (AQ) assessment provides a parallel framework for managing complex multi-code psychiatric encounters. For practices looking at broader psychology practice workflows, structuring claims around primary psychiatric diagnoses with secondary co-occurring codes follows the same sequencing logic.

Patients with delusional disorder sometimes present with co-occurring emotion dysregulation, particularly when persecutory beliefs drive anxiety or anger episodes. The ABC PLEASE handout for emotion regulation skills gives clinicians a structured skills tool to use alongside F22 treatment planning, without replacing the psychiatric evaluation documentation described above.

Practices that have transitioned to EHR systems built for private practice report fewer F22 coding errors when structured diagnostic documentation templates replace free-text notes. The combination of prompted documentation fields and integrated Pabau Scribe reduces the risk of omitting a criterion that triggers a payer audit.

F22 documentation carries more audit risk than most outpatient psychiatric codes because delusional symptoms can be described in ways that sound similar to the psychotic features found in F20.0 or the psychotic mood disorders excluded under F22.

Structured note templates that separate delusion duration, content, and functional status from a running free-text narrative reduce this risk more effectively than an unstructured note. Practices comparing options for this level of specificity can review this clinical documentation software breakdown built for behavioral health charting.

Conclusion

ICD-10 code F22 has a narrow clinical definition that payers review closely. Accurate coding depends on documentation that establishes non-bizarre delusion type, duration beyond one month, preserved general functioning, and rule-out of competing diagnoses — not just a diagnostic label in the problem list.

Pabau’s practice management platform helps psychiatric and mental health practices build F22 documentation requirements directly into clinical workflows, so clinical notes meet payer requirements at submission.

For a wider view of how documentation accuracy affects reimbursement timelines, see this healthcare revenue cycle management guide. Book a demo to see how Pabau supports accurate diagnostic coding and billing across complex mental health caseloads.

Continue your research

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