What is ICD-10 code F44.9?

F44.9 is the ICD-10-CM diagnosis code for Dissociative and conversion disorder, unspecified. A dissociative or conversion disorder diagnosis when the specific type or presentation cannot be determined or is not specified in the medical record. F44.9 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. F44.9 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. F44.9 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. F44.9 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 F44.9?

F44.9 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 F44.9 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 F44.9?

This is a default code; attempt to obtain more specific information from the provider Query the physician if additional details about the dissociative symptoms are available

F44.9: Dissociative and conversion disorder

ICD-10-CM Code View

HCC Buddy Code Card

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Code lookupF44.9Effective 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)

F44.9

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

Dissociative and conversion disorder, unspecified

A dissociative or conversion disorder diagnosis when the specific type or presentation cannot be determined or is not specified in the medical record.

Buddy Insight

This unspecified code indicates a dissociative or conversion disorder where the specific type has not been determined or documented.

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

F44.9Dissociative and conversion disorder, unspecified

Inclusion Terms

Official

Dissociative disorder NOS

Excludes 2

Official

malingering [conscious simulation] (Z76.5)

Related Child Codes

Official

F44.0Dissociative amnesia

F44.1Dissociative fugue

F44.2Dissociative stupor

F44.4Conversion disorder with motor symptom or deficit

F44.5Conversion disorder with seizures or convulsions

Includes

Official

conversion hysteria
conversion reaction
hysteria
hysterical psychosis

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for F44.9 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for F44.9 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for F44.9 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for F44.9 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Documentation of dissociative or conversion symptoms present

Evidence that symptoms are not due to an organic medical condition or substance use

Clinical reasoning supporting dissociative or conversion etiology

Notation of planned evaluation or referral if specific type is yet to be determined

MEAT Support

HCC Buddy guidance

Documentation of dissociative or conversion symptoms present

Evidence that symptoms are not due to an organic medical condition or substance use

Clinical reasoning supporting dissociative or conversion etiology

Notation of planned evaluation or referral if specific type is yet to be determined

Audit Caution

HCC Buddy guidance

Defaulting to the unspecified code when documentation supports a more specific dissociative disorder diagnosis

Using F44.9 as a placeholder without querying the provider for additional specificity

Confusing dissociative disorders with somatoform disorders — they are different clinical categories

Not reviewing the full record for psychiatric evaluation notes that may contain the specific diagnosis

Common Mistakes

HCC Buddy guidance

F44.7 (Conversion disorder with mixed symptom presentation) — use when mixed neurological conversion symptoms are documented

F44.81 (Dissociative identity disorder) — use when distinct personality states are documented

F44.89 (Other dissociative and conversion disorders) — use when a specific type is known but lacks a dedicated code

F45.9 (Somatoform disorder, unspecified) — different category; somatoform involves somatic complaints, not dissociation

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 F44.9 an HCC code?

No. F44.9 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.

MEAT Criteria for F44.9

For F44.9to 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 F44.9 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

F44.9 is the ICD-10-CM diagnosis code for dissociative and conversion disorder, unspecified. A dissociative or conversion disorder diagnosis when the specific type or presentation cannot be determined or is not specified in the medical record. F44.9 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).

F44.9 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.

F44.9 maps only to RxHCC 133 with a RAF weight of 0.000. No V28, V24, or ESRD HCC mapping exists. This unspecified code carries no meaningful risk adjustment value. Obtaining a more specific diagnosis could potentially capture a higher-value HCC mapping (e.g., F44.81 maps to V28 HCC 153 at 1.241).

HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for F44.9 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•This is a default code; attempt to obtain more specific information from the provider
•Query the physician if additional details about the dissociative symptoms are available

Clinical Significance

This unspecified code indicates a dissociative or conversion disorder where the specific type has not been determined or documented. While it captures the presence of a dissociative condition, it lacks the specificity preferred for risk adjustment and clinical accuracy. Coders should query providers to obtain a more specific diagnosis whenever possible.

Documentation Requirements

✓Documentation of dissociative or conversion symptoms present
✓Evidence that symptoms are not due to an organic medical condition or substance use
✓Clinical reasoning supporting dissociative or conversion etiology
✓Notation of planned evaluation or referral if specific type is yet to be determined
✓Functional impairment assessment

Commonly Confused Codes

•F44.7 (Conversion disorder with mixed symptom presentation): use when mixed neurological conversion symptoms are documented
•F44.81 (Dissociative identity disorder): use when distinct personality states are documented
•F44.89 (Other dissociative and conversion disorders): use when a specific type is known but lacks a dedicated code
•F45.9 (Somatoform disorder, unspecified): different category; somatoform involves somatic complaints, not dissociation
•F44.0 (Dissociative amnesia): use when specific amnesia is documented