What is ICD-10 code F45.0?

F45.0 is the ICD-10-CM diagnosis code for Somatization disorder. A condition where a person experiences multiple physical symptoms across different body systems over time, with no clear medical explanation, often related to psychological distress. It belongs to the ICD-10-CM chapter for mental, behavioral and neurodevelopmental disorders (f01-f99). F45.0 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. F45.0 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. F45.0 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. F45.0 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 F45.0?

F45.0 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 F45.0 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 F45.0?

Document the specific symptoms reported and their duration (typically years) Ensure medical workup has been completed to rule out underlying organic disease

F45.0: Somatization disorder — 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 lookupF45.0Effective 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)

F45.0

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

Somatization disorder

A condition where a person experiences multiple physical symptoms across different body systems over time, with no clear medical explanation, often related to psychological distress.

Buddy Insight

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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Compare selected patient codes to show trumped or trumps impact.

Code Book Path

Official

F45Somatoform disorders

F45.0Somatization disorder

Inclusion Terms

Official

Briquet's disorder
Multiple psychosomatic disorder

Excludes 2

Official

dissociative and conversion disorders (F44.-)
factitious disorders (F68.1-, F68.A)
hair-plucking (F63.3)
lalling (F80.0)
lisping (F80.0)

Related Child Codes

Official

F45.1Undifferentiated somatoform disorder

F45.2Hypochondriacal disorders

F45.4Pain disorders related to psychological factors

F45.8Other somatoform disorders

F45.9Somatoform disorder, unspecified

Includes

Official

ICD-10-CM does not list Includes notes for F45.0 in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for F45.0 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for F45.0 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for F45.0 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for F45.0 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

History of multiple somatic complaints beginning before age 30 spanning several years

Documentation of symptoms across at least four different body systems or functions

Evidence that symptoms are not fully explained by known medical conditions

Documentation of significant functional impairment or excessive healthcare seeking

MEAT Support

HCC Buddy guidance

History of multiple somatic complaints beginning before age 30 spanning several years

Documentation of symptoms across at least four different body systems or functions

Evidence that symptoms are not fully explained by known medical conditions

Documentation of significant functional impairment or excessive healthcare seeking

Audit Caution

HCC Buddy guidance

Coding somatization disorder when patient has fewer somatic complaints than required — consider F45.1 for undifferentiated presentations

Assigning this code when documented symptoms can be explained by known medical conditions

Failing to distinguish between somatization (unconscious) and factitious disorder (intentional) or malingering (external incentive)

Not coding comorbid depression or anxiety disorders that frequently coexist with somatization

Common Mistakes

HCC Buddy guidance

F45.1 (Undifferentiated somatoform disorder) — fewer symptoms than somatization disorder, does not meet full criteria

F44.7 (Conversion disorder with mixed symptom presentation) — conversion focuses on neurological symptoms, not multi-system somatic complaints

F45.8 (Other somatoform disorders) — use for specific somatoform presentations like psychogenic pruritus

F68.10 (Factitious disorder imposed on self) — factitious disorder involves intentional symptom production, unlike somatization

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 F45.0 an HCC code?

No. F45.0 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 F45.0

For F45.0to 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 F45.0 during that encounter, not just copy-forwarded from a problem list.

What This Code Means

F45.0 is the ICD-10-CM diagnosis code for somatization disorder. A condition where a person experiences multiple physical symptoms across different body systems over time, with no clear medical explanation, often related to psychological distress. F45.0 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).

F45.0 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.

F45.0 maps to RxHCC 133 with a RAF weight of 0.000. No CMS-HCC mapping exists under V28, V24, or ESRD models. Despite minimal direct RAF impact, this diagnosis is clinically important for care management and identifying high-utilization patients. Coders reviewing F45.0 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 F45.0 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Document the specific symptoms reported and their duration (typically years)
•Ensure medical workup has been completed to rule out underlying organic disease

Clinical Significance

Somatization disorder involves a long history of multiple somatic complaints across multiple organ systems (pain, gastrointestinal, sexual, neurological) that cannot be fully explained by medical conditions. These patients are high healthcare utilizers, frequently presenting with unexplained symptoms requiring extensive workup. Accurate coding helps identify these patients for appropriate behavioral health intervention.

Documentation Requirements

✓History of multiple somatic complaints beginning before age 30 spanning several years
✓Documentation of symptoms across at least four different body systems or functions
✓Evidence that symptoms are not fully explained by known medical conditions
✓Documentation of significant functional impairment or excessive healthcare seeking
✓Provider assessment ruling out malingering or factitious disorder

Commonly Confused Codes

•F45.1 (Undifferentiated somatoform disorder): fewer symptoms than somatization disorder, does not meet full criteria
•F44.7 (Conversion disorder with mixed symptom presentation): conversion focuses on neurological symptoms, not multi-system somatic complaints
•F45.8 (Other somatoform disorders): use for specific somatoform presentations like psychogenic pruritus
•F68.10 (Factitious disorder imposed on self): factitious disorder involves intentional symptom production, unlike somatization
•Z76.5 (Malingerer): malingering involves conscious fabrication for external gain