F90.8
BillableAttention-deficit hyperactivity disorder, other type
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is F90.8 an HCC code?
No. F90.8 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
HCC Category Mapping
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 F90.8
For F90.8to 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 F90.8 during that encounter — not just copy-forwarded from a problem list.
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 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.
F90.8 does not map to any HCC in V28 or V24 models. RxHCC maps to 133 (0.000). No risk adjustment impact. Coders reviewing F90.8 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-leverage RAF improvement available within accurate coding.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, 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
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