What is ICD-10 code F42.8?

F42.8 is the ICD-10-CM diagnosis code for Other obsessive-compulsive disorder. This code is used for obsessive-compulsive disorder presentations that have specific features but don't fit the standard OCD categories. It belongs to the ICD-10-CM chapter for mental, behavioral and neurodevelopmental disorders (f01-f99). F42.8 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. F42.8 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. F42.8 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. F42.8 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 F42.8?

F42.8 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 F42.8 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 F42.8?

Document the specific obsessions and compulsions present in the patient's presentation Use only after confirming the diagnosis doesn't meet criteria for F42.2 or F42.3

F42.8: Other obsessive-compulsive 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 lookupF42.8Effective 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)

F42.8

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

Other obsessive-compulsive disorder

This code is used for obsessive-compulsive disorder presentations that have specific features but don't fit the standard OCD categories.

Buddy Insight

Other obsessive-compulsive disorder captures OCD presentations that are predominantly obsessional or predominantly compulsive, or atypical OCD presentations not classified elsewhere.

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

F42Obsessive-compulsive disorder

F42.8Other obsessive-compulsive disorder

Inclusion Terms

Official

Anancastic neurosis
Obsessive-compulsive neurosis

Excludes 2

Official

obsessive-compulsive personality (disorder) (F60.5)
obsessive-compulsive symptoms occurring in depression (F32.-, F33.-)
obsessive-compulsive symptoms occurring in schizophrenia (F20.-)

Related Child Codes

Official

F42.2Mixed obsessional thoughts and acts

F42.3Hoarding disorder

F42.4Excoriation (skin-picking) disorder

F42.9Obsessive-compulsive disorder, unspecified

Includes

Official

ICD-10-CM does not list Includes notes for F42.8 in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for F42.8 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for F42.8 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for F42.8 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for F42.8 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Specific obsessive-compulsive symptoms documented

Description of whether obsessions or compulsions predominate, or the atypical nature of the presentation

Time consumed by symptoms and their impact on functioning

Distinction from other OCD-related disorders (hoarding, excoriation, body dysmorphic disorder)

MEAT Support

HCC Buddy guidance

Specific obsessive-compulsive symptoms documented

Description of whether obsessions or compulsions predominate, or the atypical nature of the presentation

Time consumed by symptoms and their impact on functioning

Distinction from other OCD-related disorders (hoarding, excoriation, body dysmorphic disorder)

Audit Caution

HCC Buddy guidance

Using F42.8 for conditions that have their own specific codes (hoarding, excoriation)

Confusing F42.8 (other specified) with F42.9 (unspecified) — they reflect different documentation scenarios

Not documenting why the presentation is classified as 'other' rather than mixed

Using F42.8 as a convenience code without adequate documentation of the specific OCD presentation

Common Mistakes

HCC Buddy guidance

F42.2 (Mixed obsessional thoughts and acts) — Use F42.2 when both obsessions and compulsions are equally present; F42.8 when one predominates or presentation is atypical

F42.9 (Obsessive-compulsive disorder, unspecified) — F42.8 is 'other specified'; F42.9 is 'unspecified'

F42.3 (Hoarding disorder) — Use specific hoarding code, not F42.8

F42.4 (Excoriation disorder) — Use specific excoriation code, not F42.8

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 F42.8 an HCC code?

No. F42.8 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 F42.8 in the Code Book — tabular path, V28 RAF, and MEAT checklist →

MEAT Criteria for F42.8

For F42.8to 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 F42.8 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

F42.8 is the ICD-10-CM diagnosis code for other obsessive-compulsive disorder. This code is used for obsessive-compulsive disorder presentations that have specific features but don't fit the standard OCD categories. F42.8 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).

F42.8 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.

F42.8 does not map to any HCC under V24 or V28. No ESRD mapping. RxHCC maps to RxHCC 133 at 0.0 weight. Non-risk-adjusting diagnosis. Coders reviewing F42.8 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 F42.8 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Document the specific obsessions and compulsions present in the patient's presentation
•Use only after confirming the diagnosis doesn't meet criteria for F42.2 or F42.3

Clinical Significance

Other obsessive-compulsive disorder captures OCD presentations that are predominantly obsessional or predominantly compulsive, or atypical OCD presentations not classified elsewhere. This includes primarily obsessional OCD ('pure O') where intrusive thoughts dominate without prominent rituals, or primarily compulsive presentations. It does not carry risk adjustment value.

Documentation Requirements

✓Specific obsessive-compulsive symptoms documented
✓Description of whether obsessions or compulsions predominate, or the atypical nature of the presentation
✓Time consumed by symptoms and their impact on functioning
✓Distinction from other OCD-related disorders (hoarding, excoriation, body dysmorphic disorder)
✓Current treatment approach
✓Why the presentation does not fit F42.2 (mixed) or other specific OCD codes

Commonly Confused Codes

•F42.2 (Mixed obsessional thoughts and acts): Use F42.2 when both obsessions and compulsions are equally present; F42.8 when one predominates or presentation is atypical
•F42.9 (Obsessive-compulsive disorder, unspecified): F42.8 is 'other specified'; F42.9 is 'unspecified'
•F42.3 (Hoarding disorder): Use specific hoarding code, not F42.8
•F42.4 (Excoriation disorder): Use specific excoriation code, not F42.8