What is ICD-10 code F45.29?

F45.29 is the ICD-10-CM diagnosis code for Other hypochondriacal disorders. Other specified types of excessive health anxiety or preoccupation with illness that do not fit the standard categories of hypochondriasis or body dysmorphic disorder. It belongs to the ICD-10-CM chapter for mental, behavioral and neurodevelopmental disorders (f01-f99). F45.29 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. F45.29 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. F45.29 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. F45.29 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 F45.29?

F45.29 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 F45.29 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 F45.29?

Use this code when documentation describes health anxiety features not captured by F45.21 or F45.22 Include a description of the specific hypochondriacal features in the medical record

F45.29: Other hypochondriacal 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 lookupF45.29Effective 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)

F45.29

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

Other hypochondriacal disorders

Other specified types of excessive health anxiety or preoccupation with illness that do not fit the standard categories of hypochondriasis or body dysmorphic disorder.

Buddy Insight

This code captures hypochondriacal disorders that are specified but do not fit under hypochondriasis or body dysmorphic disorder categories, such as nosophobia or disease phobia.

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

F45Somatoform disorders

F45.2Hypochondriacal disorders

F45.29Other hypochondriacal disorders

Inclusion Terms

Official

ICD-10-CM does not list inclusion terms for F45.29 in this effective period.

Excludes 2

Official

delusional dysmorphophobia (F22)
fixed delusions about bodily functions or shape (F22)

Related Child Codes

Official

F45.20Hypochondriacal disorder, unspecified

F45.21Hypochondriasis

F45.22Body dysmorphic disorder

Includes

Official

ICD-10-CM does not list Includes notes for F45.29 in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for F45.29 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for F45.29 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for F45.29 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for F45.29 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Documentation of the specific type of hypochondriacal disorder present

Evidence that the condition does not fit under hypochondriasis (F45.21) or body dysmorphic disorder (F45.22)

Documentation of illness-related preoccupation causing functional impairment

Medical evaluation ruling out the feared condition

MEAT Support

HCC Buddy guidance

Documentation of the specific type of hypochondriacal disorder present

Evidence that the condition does not fit under hypochondriasis (F45.21) or body dysmorphic disorder (F45.22)

Documentation of illness-related preoccupation causing functional impairment

Medical evaluation ruling out the feared condition

Audit Caution

HCC Buddy guidance

Using F45.29 when F45.21 or F45.22 would be more appropriate and specific

Confusing disease phobia (intense fear of contracting a disease) with hypochondriasis (conviction of already having a disease)

Not documenting which specific hypochondriacal variant is present to justify the 'other' category

Defaulting to F45.20 (unspecified) when the documentation describes a specific type that should be coded as F45.29

Common Mistakes

HCC Buddy guidance

F45.21 (Hypochondriasis) — use for classic illness conviction/fear presentations

F45.22 (Body dysmorphic disorder) — use when preoccupation is with physical appearance defects

F45.20 (Hypochondriacal disorder, unspecified) — use only when the type cannot be determined

F40.228 (Other natural environment type phobia) — specific phobias of diseases may be classified here

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 F45.29 an HCC code?

F45.29 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.

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 F45.29 in the Code Book — tabular path, V28 RAF, and MEAT checklist →

MEAT Criteria for F45.29

For F45.29to 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 F45.29 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

F45.29 is the ICD-10-CM diagnosis code for other hypochondriacal disorders. Other specified types of excessive health anxiety or preoccupation with illness that do not fit the standard categories of hypochondriasis or body dysmorphic disorder. F45.29 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).

F45.29 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 F45.29 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 F45.29 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Use this code when documentation describes health anxiety features not captured by F45.21 or F45.22
•Include a description of the specific hypochondriacal features in the medical record

Clinical Significance

This code captures hypochondriacal disorders that are specified but do not fit under hypochondriasis or body dysmorphic disorder categories, such as nosophobia or disease phobia. These conditions represent significant health anxiety variants requiring psychological intervention. Accurate classification helps differentiate from general anxiety disorders.

Documentation Requirements

✓Documentation of the specific type of hypochondriacal disorder present
✓Evidence that the condition does not fit under hypochondriasis (F45.21) or body dysmorphic disorder (F45.22)
✓Documentation of illness-related preoccupation causing functional impairment
✓Medical evaluation ruling out the feared condition
✓Provider explicitly documenting the hypochondriacal nature of the concern

Commonly Confused Codes

•F45.21 (Hypochondriasis): use for classic illness conviction/fear presentations
•F45.22 (Body dysmorphic disorder): use when preoccupation is with physical appearance defects
•F45.20 (Hypochondriacal disorder, unspecified): use only when the type cannot be determined
•F40.228 (Other natural environment type phobia): specific phobias of diseases may be classified here
•F41.1 (Generalized anxiety disorder): broader anxiety presentation, not specifically illness-focused