What is ICD-10 code F44.4?

F44.4 is the ICD-10-CM diagnosis code for Conversion disorder with motor symptom or deficit. A condition where psychological stress causes physical weakness, paralysis, or loss of motor control without any neurological disease or injury. It belongs to the ICD-10-CM chapter for mental, behavioral and neurodevelopmental disorders (f01-f99). F44.4 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. F44.4 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. F44.4 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. F44.4 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 F44.4?

F44.4 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 community model rewards F44.4 with a risk adjustment factor, it contributes zero to a Medicare Advantage beneficiary's V28/V24 community RAF score in either version. It does, however, map under the Part D RxHCC model (Personality Disorders, Anxiety, and Other Specified Mental Disorders), which affects the ESRD and/or Part D (RxHCC) risk scores. Coders should check whether provider documentation supports a more specific child code that does map to a community payment HCC.

What should coders know when reporting F44.4?

Specify the affected body part or limb in documentation Confirm neurological testing has ruled out organic causes before assigning this code

2026 ICD-10-CM F44.4: Conversion disorder with motor symptom

ICD-10-CM Code View

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Code lookupF44.4Effective 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)

F44.4

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

Conversion disorder with motor symptom or deficit

A condition where psychological stress causes physical weakness, paralysis, or loss of motor control without any neurological disease or injury.

Buddy Insight

CMS-HCC V28

N/A

—

Not risk-adjusted for this model/period.

Not mapped

CMS-HCC V24

N/A

—

Not risk-adjusted for this model/period.

Not mapped

ACA/HHS

N/A

—

Not risk-adjusted for this model/period.

Not mapped

ESRD/PACE

N/A

—

Not risk-adjusted for this model/period.

Not mapped

RXHCC

Mapped

HCC 133

Personality Disorders, Anxiet...

RAF 0.035

Code Book Path

Official

F44Dissociative and conversion disorders

F44.4Conversion disorder with motor symptom or deficit

Inclusion Terms

Official

Conversion disorder with abnormal movement
Conversion disorder with speech symptoms
Conversion disorder with swallowing symptoms
Conversion disorder with weakness/paralysis
Dissociative motor disorders

Excludes 2

Official

malingering [conscious simulation] (Z76.5)

Related Child Codes

Official

F44.0Dissociative amnesia

F44.1Dissociative fugue

F44.2Dissociative stupor

F44.5Conversion disorder with seizures or convulsions

F44.6Conversion disorder with sensory symptom or deficit

Includes

Official

conversion hysteria
conversion reaction
hysteria
hysterical psychosis

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for F44.4 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for F44.4 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for F44.4 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for F44.4 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

One or more motor symptoms (weakness, paralysis, tremor, dystonia, abnormal gait, etc.)

Clinical findings providing evidence of incompatibility between the symptom and recognized neurological conditions (positive signs such as Hoover sign, give-way weakness, inconsistent examination)

Symptom or deficit not better explained by another medical or mental disorder

Symptom causes clinically significant distress or functional impairment

MEAT Support

HCC Buddy guidance

One or more motor symptoms (weakness, paralysis, tremor, dystonia, abnormal gait, etc.)

Clinical findings providing evidence of incompatibility between the symptom and recognized neurological conditions (positive signs such as Hoover sign, give-way weakness, inconsistent examination)

Symptom or deficit not better explained by another medical or mental disorder

Symptom causes clinically significant distress or functional impairment

Audit Caution

HCC Buddy guidance

Coding conversion disorder without documented positive signs of functional origin — the diagnosis requires clinical evidence of incompatibility, not just absence of organic findings

Using F44.4 as a diagnosis of exclusion without proper neurological evaluation

Confusing conversion disorder with malingering or factitious disorder — conversion symptoms are involuntary

Not recognizing that conversion disorder and neurological disease can coexist in the same patient

Common Mistakes

HCC Buddy guidance

F44.5 (Conversion disorder with seizures or convulsions) — Use F44.5 for non-epileptic seizures; F44.4 is for motor deficits without seizures

F44.6 (Conversion disorder with sensory symptom or deficit) — Use F44.6 for sensory symptoms; F44.4 is motor-specific

G83.9 (Paralytic syndrome, unspecified) — Organic paralysis; use F44.4 only when neurological workup demonstrates functional origin

G25.0 (Essential tremor) — Organic tremor must be distinguished from functional/conversion tremor

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 F44.4 an HCC code?

F44.4 is not in the CMS-HCC V28 or V24 community payment model, but it does map to Personality Disorders, Anxiety, and Other Specified Mental Disorders under the Part D RxHCC model.

Code: F44.4
Description: Conversion disorder with motor symptom or deficit
HCC (V28): No CMS-HCC V28 mapping
RAF: —
Billable: Yes
Payment year: 2026

HCC Category Mapping

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

0.035

Each model's RAF is its CMS base weight for that model's standard population, so 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 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 F44.4 in the Code Book — tabular path, V28 RAF, and MEAT checklist →

MEAT Criteria for F44.4

For F44.4 to 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 F44.4 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

F44.4 is the ICD-10-CM diagnosis code for conversion disorder with motor symptom or deficit. A condition where psychological stress causes physical weakness, paralysis, or loss of motor control without any neurological disease or injury. F44.4 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).

F44.4 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 F44.4 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 F44.4 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Specify the affected body part or limb in documentation
•Confirm neurological testing has ruled out organic causes before assigning this code

Clinical Significance

Conversion disorder with motor symptom or deficit (functional neurological symptom disorder) involves neurological symptoms such as weakness, paralysis, abnormal movements, or gait disturbance that are incompatible with recognized neurological conditions. These symptoms are genuine and involuntary, causing significant distress and disability. Accurate diagnosis requires thorough neurological evaluation.

Documentation Requirements

✓One or more motor symptoms (weakness, paralysis, tremor, dystonia, abnormal gait, etc.)
✓Clinical findings providing evidence of incompatibility between the symptom and recognized neurological conditions (positive signs such as Hoover sign, give-way weakness, inconsistent examination)
✓Symptom or deficit not better explained by another medical or mental disorder
✓Symptom causes clinically significant distress or functional impairment
✓Neurological examination findings documented including positive clinical signs of functional origin
✓Results of diagnostic workup (MRI, EMG, EEG) ruling out structural neurological disease
✓Psychological stressor identified if applicable (though not required for diagnosis)

Commonly Confused Codes

•F44.5 (Conversion disorder with seizures or convulsions): Use F44.5 for non-epileptic seizures; F44.4 is for motor deficits without seizures
•F44.6 (Conversion disorder with sensory symptom or deficit): Use F44.6 for sensory symptoms; F44.4 is motor-specific
•G83.9 (Paralytic syndrome, unspecified): Organic paralysis; use F44.4 only when neurological workup demonstrates functional origin
•G25.0 (Essential tremor): Organic tremor must be distinguished from functional/conversion tremor