F84.8
BillableOther pervasive developmental disorders
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is F84.8 an HCC code?
No. F84.8 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 F84.8
For F84.8 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 F84.8 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
F84.8 is the ICD-10-CM diagnosis code for other pervasive developmental disorders. A pervasive developmental disorder that does not fit the criteria for autism, Asperger's syndrome, Rett syndrome, or other childhood disintegrative disorder. F84.8 sits in the ICD-10-CM chapter for mental, behavioral and neurodevelopmental disorders (f01-f99), within the section covering pervasive and specific developmental disorders (f80-f89).
F84.8 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.
F84.8 does not map to any HCC in V28 or V24 models. RxHCC maps to 133 (0.000). No RAF score impact. Code for clinical documentation accuracy. Coders reviewing F84.8 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 F84.8 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this code only after ruling out more specific pervasive developmental disorder codes
- •Document the atypical features that prevent classification into other F84 categories
Clinical Significance
This code captures pervasive developmental disorders that are specifically identified but do not meet full criteria for autistic disorder, Asperger's syndrome, Rett syndrome, or childhood disintegrative disorder. This includes overactive disorder associated with intellectual disability and stereotyped movements. These conditions still represent significant neurodevelopmental challenges requiring specialized support.
Documentation Requirements
- ✓Provider documentation of a specific pervasive developmental disorder that does not fit other classified categories
- ✓Evidence of pervasive developmental features (social, communication, or behavioral) not meeting full criteria for F84.0, F84.2, F84.3, or F84.5
- ✓Documentation of functional impairment in social, communication, or adaptive domains
- ✓Assessment distinguishing this from other developmental or psychiatric conditions
- ✓Current treatment plan including developmental or behavioral interventions
Commonly Confused Codes
- •F84.0 — Autistic disorder; if full autism criteria are met, use F84.0
- •F84.9 — Pervasive developmental disorder, unspecified; F84.8 requires identification of a specific atypical PDD presentation
- •F84.5 — Asperger's syndrome; if Asperger's criteria are met, use F84.5
- •F88 — Other disorders of psychological development; for developmental conditions not fitting the pervasive developmental disorder category