Yes. F90.9 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. F90.9 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 F90.9?

F90.9 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 F90.9 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 F90.9?

Use only when type cannot be determined from available documentation; query provider for clarification when possible This code should be temporary; aim to specify the ADHD subtype with additional clinical information

2026 ICD-10-CM F90.9: Attention-deficit hyperactivity

ICD-10-CM Code View

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Code lookupF90.9Effective 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)

F90.9

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

Attention-deficit hyperactivity disorder, unspecified type

Attention-deficit hyperactivity disorder where the specific presentation type (inattentive, hyperactive, or combined) has not been determined or documented.

Buddy Insight

Unspecified ADHD is used when the provider documents an ADHD diagnosis without specifying the subtype (inattentive, hyperactive-impulsive, or combined).

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

F90Attention-deficit hyperactivity disorders

F90.9Attention-deficit hyperactivity disorder, unspecified type

Inclusion Terms

Official

Attention-deficit hyperactivity disorder of childhood or adolescence NOS
Attention-deficit hyperactivity disorder NOS

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

F90.8Attention-deficit hyperactivity disorder, other 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 F90.9 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for F90.9 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for F90.9 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for F90.9 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Provider documentation of ADHD diagnosis

Evidence of inattention and/or hyperactivity-impulsivity symptoms

Query opportunity — attempt to obtain subtype specification from the provider

Documentation of functional impairment

MEAT Support

HCC Buddy guidance

Provider documentation of ADHD diagnosis

Evidence of inattention and/or hyperactivity-impulsivity symptoms

Query opportunity — attempt to obtain subtype specification from the provider

Documentation of functional impairment

Audit Caution

HCC Buddy guidance

Defaulting to F90.9 when the provider documentation supports a specific subtype

Using R41.840 (attention deficit symptom) instead of diagnosing ADHD when the criteria are met

Failing to query the provider for subtype specification when they have documented 'ADHD' without further detail

Coding F90.9 based on symptom descriptions alone without a provider-documented ADHD diagnosis

Common Mistakes

HCC Buddy guidance

F90.0 — ADHD, predominantly inattentive type; use when inattentive subtype is documented

F90.1 — ADHD, predominantly hyperactive type; use when hyperactive subtype is documented

F90.2 — ADHD, combined type; use when combined subtype is documented

R41.840 — Attention and concentration deficit; this symptom code should not be used when ADHD is diagnosed

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 F90.9 an HCC code?

F90.9 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: F90.9
Description: Attention-deficit hyperactivity disorder, unspecified type
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 F90.9 in the Code Book — tabular path, V28 RAF, and MEAT checklist →

MEAT Criteria for F90.9

For F90.9 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 F90.9 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

F90.9 is the ICD-10-CM diagnosis code for attention-deficit hyperactivity disorder, unspecified type. Attention-deficit hyperactivity disorder where the specific presentation type (inattentive, hyperactive, or combined) has not been determined or documented. F90.9 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).

F90.9 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 F90.9 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 F90.9 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Use only when type cannot be determined from available documentation; query provider for clarification when possible
•This code should be temporary; aim to specify the ADHD subtype with additional clinical information

Clinical Significance

Unspecified ADHD is used when the provider documents an ADHD diagnosis without specifying the subtype (inattentive, hyperactive-impulsive, or combined). While clinically acceptable, subtype specification improves treatment planning and medication selection. This code is commonly seen when ADHD is documented in problem lists or by non-psychiatry providers without detailed subtype assessment.

Documentation Requirements

✓Provider documentation of ADHD diagnosis
✓Evidence of inattention and/or hyperactivity-impulsivity symptoms
✓Query opportunity — attempt to obtain subtype specification from the provider
✓Documentation of functional impairment
✓Current treatment plan

Commonly Confused Codes

•F90.0: ADHD, predominantly inattentive type; use when inattentive subtype is documented
•F90.1: ADHD, predominantly hyperactive type; use when hyperactive subtype is documented
•F90.2: ADHD, combined type; use when combined subtype is documented
•R41.840: Attention and concentration deficit; this symptom code should not be used when ADHD is diagnosed