What is ICD-10 code F90.8?

F90.8 is the ICD-10-CM diagnosis code for Attention-deficit hyperactivity disorder, other type. Attention-deficit hyperactivity disorder that does not fit neatly into the standard inattentive, hyperactive, or combined presentations. It belongs to the ICD-10-CM chapter for mental, behavioral and neurodevelopmental disorders (f01-f99). F90.8 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. F90.8 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. F90.8 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. F90.8 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.

Which HCC does F90.8 map to under V28?

F90.8 has no payable CMS-HCC V28 mapping in the final FY2026 CMS file.

What RAF reference is published for F90.8?

F90.8 has no V28 reference coefficient because the final FY2026 source verifies no payable V28 mapping.

What is the V28 vs V24 difference for F90.8?

F90.8 has verified no payable V28 mapping in the final FY2026 source. Select a historical effective period before making any V24 comparison.

What documentation supports F90.8?

Use only when documentation clearly describes ADHD symptoms that don't align with F90.0, F90.1, or F90.2 Include specific clinical features in documentation to justify use of 'other type' classification F90.8 is not a CMS-HCC V28 payment code in the verified current source, so MEAT is not the payment hook. Documentation still has to support the diagnosis if you report it.

2026 ICD-10-CM F90.8: Attention-deficit hyperactivity

F90.8 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC coding software

ICD-10-CM Code View

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Code lookupF90.8Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Mental, Behavioral and Neurodevelopmental disorders (F01-F99) / Behavioral and emotional disorders with onset usually occurring in childhood and adolescence (F90-F98)

F90.8

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

Attention-deficit hyperactivity disorder, other type

Attention-deficit hyperactivity disorder that does not fit neatly into the standard inattentive, hyperactive, or combined presentations.

Buddy Insight

ADHD other type captures presentations that do not fit neatly into the predominantly inattentive, predominantly hyperactive-impulsive, or combined subtypes.

CMS-HCC V28

N/A

—

Not risk-adjusted for this model/period.

Not mapped

CMS-HCC V24

Historical

Not used for standard CY2026 Medicare Advantage payment. Select a historical period to review V24.

Not used for CY2026 payment

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

Anxiety and Other Psychiatric...

Code-level coefficient reference

Code Book Path

Official

F90Attention-deficit hyperactivity disorders

F90.8Attention-deficit hyperactivity disorder, other type

Inclusion Terms

Official

ICD-10-CM does not list inclusion terms for F90.8 in this effective period.

Excludes 2

Official

anxiety disorders (F40.-, F41.-)
mood [affective] disorders (F30-F39)
pervasive developmental disorders (F84.-)
schizophrenia (F20.-)

Related Child Codes

Official

F90.0Attention-deficit hyperactivity disorder, predominantly inattentive type

F90.1Attention-deficit hyperactivity disorder, predominantly hyperactive type

F90.2Attention-deficit hyperactivity disorder, combined type

F90.9Attention-deficit hyperactivity disorder, unspecified type

Includes

Official

attention deficit disorder with hyperactivity
attention deficit syndrome with hyperactivity

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for F90.8 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for F90.8 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for F90.8 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for F90.8 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Provider documentation of ADHD with specification that it does not fit standard subtypes

Clinical rationale for why the standard subtypes (inattentive, hyperactive, combined) are not appropriate

Evidence of ADHD symptoms causing functional impairment

Documentation of the specific atypical features warranting the 'other type' classification

MEAT Support

HCC Buddy guidance

Provider documentation of ADHD with specification that it does not fit standard subtypes

Clinical rationale for why the standard subtypes (inattentive, hyperactive, combined) are not appropriate

Evidence of ADHD symptoms causing functional impairment

Documentation of the specific atypical features warranting the 'other type' classification

Audit Caution

HCC Buddy guidance

Using F90.8 when the presentation actually fits a standard subtype — this code should be rarely used

Confusing F90.8 with F90.9 — F90.8 is for specifically atypical presentations, F90.9 is for unspecified

Coding F90.8 without clinical documentation explaining why the standard subtypes do not apply

Defaulting to F90.8 when the subtype assessment is simply incomplete — use F90.9 in that case

Common Mistakes

HCC Buddy guidance

F90.0 — ADHD, predominantly inattentive type; use when inattention criteria are clearly met

F90.1 — ADHD, predominantly hyperactive type; use when hyperactivity-impulsivity criteria are clearly met

F90.2 — ADHD, combined type; use when both dimensions meet full criteria

F90.9 — ADHD, unspecified type; F90.8 implies a specific atypical presentation, while F90.9 is for unknown subtype

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 F90.8 an HCC code?

F90.8 is not in the CMS-HCC V28 or V24 community payment model. F90.8 has a separate mapping under the Part D RxHCC model (HCC 133 (Anxiety and Other Psychiatric Disorders)); the applicable result needs member context.

Code: F90.8
Description: Attention-deficit hyperactivity disorder, other type
HCC (V28): No CMS-HCC V28 mapping
RAF reference coefficient: —
Billable: Yes
Payment year: 2026

HCC Category Mapping

RxHCCHCC 133, Anxiety and Other Psychiatric Disorders

Not separately weighted

These are source-labeled model coefficients, not member totals. A category may still be removed by hierarchy or model cleanup rules. 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 context, hierarchy and cleanup rules, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains available for historical review.

Work F90.8 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT Criteria for F90.8

For F90.8 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 F90.8 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

F90.8 is the ICD-10-CM diagnosis code for attention-deficit hyperactivity disorder, other type. Attention-deficit hyperactivity disorder that does not fit neatly into the standard inattentive, hyperactive, or combined presentations. F90.8 sits in the ICD-10-CM chapter for mental, behavioral and neurodevelopmental disorders (f01-f99), within the section covering behavioral and emotional disorders with onset usually occurring in childhood and adolescence (f90-f98).

F90.8 has no mapping under the CMS-HCC V28 or V24 community payment models. F90.8 has a separate mapping under the Part D RxHCC model (HCC 133 (Anxiety and Other Psychiatric Disorders)); the applicable result needs member context. Do not assign V28 risk adjustment value from this page; verify the applicable model and payment year before using this code for risk adjustment.

Use only when documentation clearly describes ADHD symptoms that don't align with F90.0, F90.1, or F90.2.

HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for F90.8 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Use only when documentation clearly describes ADHD symptoms that don't align with F90.0, F90.1, or F90.2
•Include specific clinical features in documentation to justify use of 'other type' classification

Clinical Significance

ADHD other type captures presentations that do not fit neatly into the predominantly inattentive, predominantly hyperactive-impulsive, or combined subtypes. This may include late-onset presentations, those with atypical symptom clusters, or presentations that were once classified differently. This code is used sparingly and should be supported by clear clinical rationale.

Documentation Requirements

✓Provider documentation of ADHD with specification that it does not fit standard subtypes
✓Clinical rationale for why the standard subtypes (inattentive, hyperactive, combined) are not appropriate
✓Evidence of ADHD symptoms causing functional impairment
✓Documentation of the specific atypical features warranting the 'other type' classification
✓Current treatment plan

Commonly Confused Codes

•F90.0: ADHD, predominantly inattentive type; use when inattention criteria are clearly met
•F90.1: ADHD, predominantly hyperactive type; use when hyperactivity-impulsivity criteria are clearly met
•F90.2: ADHD, combined type; use when both dimensions meet full criteria
•F90.9: ADHD, unspecified type; F90.8 implies a specific atypical presentation, while F90.9 is for unknown subtype