F90.0 ICD-10-CM Code: Attention-deficit hyperactivity disorder, predominantly inattentive type
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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)
F90.0
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceAttention-deficit hyperactivity disorder, predominantly inattentive type
A neurodevelopmental condition where a person has difficulty paying attention and staying focused, but without significant hyperactivity or impulsive behavior.
Buddy Insight
ADHD predominantly inattentive type (formerly ADD) is characterized by persistent inattention without significant hyperactivity-impulsivity.
CMS-HCC V28
00
RAF 0
CMS-HCC V24
00
RAF 0
ACA/HHS
00
RAF 0
ESRD/PACE
00
RAF 0
RXHCC
MappedHCC 133
RAF 0.0
Code Trumping
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Code Book Path
Inclusion Terms
Official- Attention-deficit/hyperactivity disorder, predominantly inattentive presentation
Excludes 2
Official- anxiety disorders (F40.-, F41.-)
- mood [affective] disorders (F30-F39)
- pervasive developmental disorders (F84.-)
- schizophrenia (F20.-)
Related Child Codes
Includes
Official- attention deficit disorder with hyperactivity
- attention deficit syndrome with hyperactivity
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for F90.0 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for F90.0 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for F90.0 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for F90.0 in this effective period.
Buddy Documentation Tip
MEAT Support
Audit Caution
Common Mistakes
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 F90.0 an HCC code?
No. F90.0 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
HCC Category Mapping
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 F90.0
For F90.0to 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 F90.0 during that encounter, not just copy-forwarded from a problem list.
Coder workflow notes
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What This Code Means
F90.0 is the ICD-10-CM diagnosis code for attention-deficit hyperactivity disorder, predominantly inattentive type. A neurodevelopmental condition where a person has difficulty paying attention and staying focused, but without significant hyperactivity or impulsive behavior. F90.0 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).
F90.0 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.
F90.0 does not map to any HCC in V28 or V24 models and has no RAF score impact. RxHCC maps to 133 (0.000). ADHD has no risk adjustment weight, but accurate subtype coding supports appropriate medication management and treatment planning.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for F90.0 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Verify documentation specifies 'predominantly inattentive' presentation to distinguish from other ADHD subtypes
- •Confirm age-appropriate diagnosis; this type is often diagnosed in school-age children or adults who were previously undiagnosed
Clinical Significance
ADHD predominantly inattentive type (formerly ADD) is characterized by persistent inattention without significant hyperactivity-impulsivity. Patients have difficulty sustaining focus, following through on tasks, and organizing activities. This subtype is often underdiagnosed, particularly in females and adults, and is associated with academic underachievement, occupational difficulties, and comorbid anxiety and depression.
Documentation Requirements
- ✓Provider documentation specifying ADHD, predominantly inattentive presentation/type
- ✓Evidence of six or more inattention symptoms (adults: five or more) persisting for at least 6 months
- ✓Documentation that symptoms are present in two or more settings (e.g., home, work/school, social)
- ✓Evidence of functional impairment in academic, occupational, or social domains
- ✓Documentation that symptoms are not better explained by another mental disorder (anxiety, mood disorder, psychosis)
Commonly Confused Codes
- •F90.1: ADHD, predominantly hyperactive type; hyperactive type is characterized by fidgetiness and impulsivity without significant inattention
- •F90.2: ADHD, combined type; combined type meets criteria for both inattention and hyperactivity-impulsivity
- •F90.9: ADHD, unspecified type; use F90.0 when the predominantly inattentive subtype is documented
- •F41.1: Generalized anxiety disorder; anxiety can cause concentration difficulties mimicking inattentive ADHD