I67.0
BillableDissection of cerebral arteries, nonruptured
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is I67.0 an HCC code?
Yes. I67.0 maps to Vascular Disease with Complications under the V24 model but is not retained in V28.
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 I67.0
For I67.0to 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 I67.0 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
I67.0 is the ICD-10-CM diagnosis code for dissection of cerebral arteries, nonruptured. A tear in the inner lining of a brain artery that has not ruptured, which can cause narrowing and potentially lead to stroke. I67.0 sits in the ICD-10-CM chapter for diseases of the circulatory system (i00-i99), within the section covering cerebrovascular diseases (i60-i69).
Under the older CMS-HCC V24 model, I67.0 maps to Vascular Disease with Complications (HCC 107) with a community, non-dual, aged base RAF weight of 0.450. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition.
The 'nonruptured' specification is critical; if rupture occurs, use a different code. Because I67.0 maps to a payment HCC, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's Medicare Advantage risk adjustment score. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for I67.0 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •The 'nonruptured' specification is critical; if rupture occurs, use a different code
- •Document the location and extent of dissection when available
Clinical Significance
Cerebral artery dissection is a tear in the inner lining of a cerebral artery, which can lead to stroke or transient ischemic attack. This condition particularly affects younger patients and may result from trauma, connective tissue disorders, or occur spontaneously. Accurate coding is important for risk adjustment as it captures a significant vascular condition requiring anticoagulation or antiplatelet therapy and close monitoring.
Documentation Requirements
- ✓Explicit documentation of cerebral artery dissection by the provider
- ✓Specification that the dissection is nonruptured (if ruptured, different coding applies)
- ✓Identification of the affected artery when documented (carotid vs. vertebral dissection may have separate codes)
- ✓Imaging confirmation (CT angiography, MR angiography, or conventional angiography)
- ✓Documentation of whether the dissection is traumatic or spontaneous in origin
- ✓Current treatment plan (anticoagulation, antiplatelet therapy, or surgical/endovascular intervention)
Excludes 1 — Do NOT code together
- ruptured cerebral arteries (I60.7)
Commonly Confused Codes
- •I72.0 — Aneurysm of carotid artery; dissection and aneurysm are different pathologies
- •I77.71 — Dissection of carotid artery (extracranial); for dissection outside the skull, not intracranial
- •I77.79 — Dissection of other specified artery; for non-cerebral artery dissections
- •I63.0x — Cerebral infarction due to thrombosis of precerebral arteries; code the stroke separately if it results from the dissection