F63.81
BillableIntermittent explosive disorder
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is F63.81 an HCC code?
No. F63.81 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 F63.81
For F63.81 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 F63.81 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
F63.81 is the ICD-10-CM diagnosis code for intermittent explosive disorder. A condition marked by recurrent episodes of aggressive outbursts that are disproportionate to the triggering stressor, with inability to control anger. F63.81 sits in the ICD-10-CM chapter for mental, behavioral and neurodevelopmental disorders (f01-f99), within the section covering disorders of adult personality and behavior (f60-f69).
F63.81 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.
F63.81 does not map to any HCC in V28 or V24 models and has no RAF score contribution. RxHCC maps to 133 (0.000). No direct risk adjustment impact, but clinical documentation supports behavioral health treatment coordination. Coders reviewing F63.81 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 F63.81 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Differentiate from aggression secondary to other conditions like bipolar disorder, ADHD, or substance use
- •Document specific episodes showing loss of control and disproportionate response
Clinical Significance
Intermittent explosive disorder (IED) is characterized by recurrent behavioral outbursts representing a failure to control aggressive impulses, manifesting as verbal aggression or physical aggression toward property, animals, or people. The aggression is grossly disproportionate to the provocation. IED is associated with increased emergency department utilization, legal problems, and comorbid depression, anxiety, and substance use disorders.
Documentation Requirements
- ✓Provider documentation of recurrent behavioral outbursts with failure to control aggressive impulses
- ✓Evidence that aggressive outbursts are grossly out of proportion to the provocation or stressor
- ✓Documentation that episodes are not premeditated and are not committed to achieve a tangible objective
- ✓Exclusion of aggression better explained by another mental disorder (bipolar mania, conduct disorder, antisocial PD, psychosis, substance intoxication)
- ✓Minimum age of 6 years; assessment of chronicity (recurrent episodes over at least 3 months)
Commonly Confused Codes
- •F91.3 — Oppositional defiant disorder; ODD involves a pattern of angry/irritable mood and argumentative behavior but typically less severe physical aggression
- •F60.2 — Antisocial personality disorder; aggression in ASPD is part of a broader antisocial pattern, not isolated explosive episodes
- •F31.x — Bipolar disorder; irritability and aggression during manic/mixed episodes are symptoms of bipolar, not IED
- •F63.89 — Other impulse disorders; use F63.81 specifically when IED is diagnosed