What is ICD-10 code F44.89?

F44.89 is the ICD-10-CM diagnosis code for Other dissociative and conversion disorders. Other rare dissociative or conversion disorders that do not fit into the more specific categories, such as trance states or possession-form disorders. It belongs to the ICD-10-CM chapter for mental, behavioral and neurodevelopmental disorders (f01-f99). F44.89 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. F44.89 is part of the FY2026 ICD-10-CM code set published by the CMS National Center for Health Statistics and used on Medicare, Medicaid, and commercial claims in the United States.

Yes. F44.89 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. F44.89 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

What is the V28 vs V24 difference for F44.89?

F44.89 does not map to a payment HCC under either the CMS-HCC V28 risk adjustment model or the older V24 model. V28 reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition. Because neither model rewards F44.89 with a risk adjustment factor, it contributes zero to a Medicare Advantage beneficiary's RAF score in either version. Coders should check whether provider documentation supports a more specific child code that does map to a payment HCC.

What should coders know when reporting F44.89?

Use this code only when the specific dissociative or conversion disorder cannot be classified elsewhere Include detailed clinical documentation describing the specific symptoms and presentation

F44.89: Other dissociative and conversion disorders — ICD-10

ICD-10-CM Code View

HCC Buddy Code Card

Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.

Code lookupF44.89Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Mental, Behavioral and Neurodevelopmental disorders (F01-F99) / Anxiety, dissociative, stress-related, somatoform and other nonpsychotic mental disorders (F40-F48)

F44.89

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Other dissociative and conversion disorders

Other rare dissociative or conversion disorders that do not fit into the more specific categories, such as trance states or possession-form disorders.

Buddy Insight

This code captures dissociative and conversion conditions that do not fit neatly into other specified categories, such as dissociative trance, Ganser syndrome, or psychogenic confusion.

CMS-HCC V28

Not risk-adjusted for this model/period.

RAF 0

CMS-HCC V24

Not risk-adjusted for this model/period.

RAF 0

ACA/HHS

Not risk-adjusted for this model/period.

RAF 0

ESRD/PACE

Not risk-adjusted for this model/period.

RAF 0

RXHCC

Mapped

HCC 133

Personality Disorders, Anxiet...

RAF 0.0

Code Trumping

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Code Book Path

Official

F44Dissociative and conversion disorders

F44.8Other dissociative and conversion disorders

F44.89Other dissociative and conversion disorders

Inclusion Terms

Official

Ganser's syndrome
Psychogenic confusion
Psychogenic twilight state
Trance and possession disorders

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for F44.89 in this effective period.

Related Child Codes

Official

F44.81Dissociative identity disorder

Includes

Official

ICD-10-CM does not list Includes notes for F44.89 in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for F44.89 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for F44.89 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for F44.89 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for F44.89 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Specific description of the dissociative or conversion symptoms present

Documentation explaining why the condition does not fit other specified dissociative disorder categories

Psychiatric evaluation supporting the dissociative nature of symptoms

Exclusion of organic medical conditions and substance-induced causes

MEAT Support

HCC Buddy guidance

Specific description of the dissociative or conversion symptoms present

Documentation explaining why the condition does not fit other specified dissociative disorder categories

Psychiatric evaluation supporting the dissociative nature of symptoms

Exclusion of organic medical conditions and substance-induced causes

Audit Caution

HCC Buddy guidance

Using this code when a more specific dissociative disorder code exists (e.g., F44.81 for dissociative identity disorder)

Coding dissociative symptoms without documenting the ruling out of neurological or substance-related causes

Confusing 'other specified' (F44.89) with 'unspecified' (F44.9) — use F44.89 when the type is known but lacks a unique code

Failing to capture the specific dissociative phenomenon in documentation to justify the 'other' category

Common Mistakes

HCC Buddy guidance

F44.81 (Dissociative identity disorder) — requires distinct personality states, not just dissociative symptoms

F44.7 (Conversion disorder with mixed symptom presentation) — use when multiple conversion symptom types are present

F44.9 (Dissociative and conversion disorder, unspecified) — use F44.89 when a specific type IS identified but lacks its own code

F48.1 (Depersonalization-derealization syndrome) — has its own specific code, do not use F44.89

Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.

Is F44.89 an HCC code?

No. F44.89 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.

HCC Category Mapping

RxHCCHCC 133, Personality Disorders, Anxiety, and Other Specified Mental Disorders

0.000

RAF weights shown are the community, non-dual, aged base weights from the CMS risk adjustment model file. Actual per-patient RAF contribution depends on member segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.

Work F44.89 in the Code Book — tabular path, V28 RAF, and MEAT checklist →

MEAT Criteria for F44.89

For F44.89to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically, it has to be re-documented and supported each calendar year.

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

Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed F44.89 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

F44.89 is the ICD-10-CM diagnosis code for other dissociative and conversion disorders. Other rare dissociative or conversion disorders that do not fit into the more specific categories, such as trance states or possession-form disorders. F44.89 sits in the ICD-10-CM chapter for mental, behavioral and neurodevelopmental disorders (f01-f99), within the section covering anxiety, dissociative, stress-related, somatoform and other nonpsychotic mental disorders (f40-f48).

F44.89 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.

This code does not map to a CMS-HCC V28 payment category. Capture depends on documentation that supports the diagnosis; verify the HCC assignment against the current CMS mapping for the applicable payment year. Coders reviewing F44.89 should check whether additional documentation would support a more specific child code in the same hierarchy that does map to a payment HCC, capturing the correct specificity is the highest-impact RAF improvement available within accurate coding.

HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for F44.89 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Use this code only when the specific dissociative or conversion disorder cannot be classified elsewhere
•Include detailed clinical documentation describing the specific symptoms and presentation

Clinical Significance

This code captures dissociative and conversion conditions that do not fit neatly into other specified categories, such as dissociative trance, Ganser syndrome, or psychogenic confusion. These conditions reflect significant psychological distress and may require specialized psychiatric treatment. While not directly HCC-mapped in major models, accurate coding ensures appropriate care planning.

Documentation Requirements

✓Specific description of the dissociative or conversion symptoms present
✓Documentation explaining why the condition does not fit other specified dissociative disorder categories
✓Psychiatric evaluation supporting the dissociative nature of symptoms
✓Exclusion of organic medical conditions and substance-induced causes
✓Documentation of functional impairment and treatment plan

Commonly Confused Codes

•F44.81 (Dissociative identity disorder): requires distinct personality states, not just dissociative symptoms
•F44.7 (Conversion disorder with mixed symptom presentation): use when multiple conversion symptom types are present
•F44.9 (Dissociative and conversion disorder, unspecified): use F44.89 when a specific type IS identified but lacks its own code
•F48.1 (Depersonalization-derealization syndrome): has its own specific code, do not use F44.89
•F44.2 (Dissociative stupor): use for specific dissociative stupor presentations