I60.32
BillableNontraumatic subarachnoid hemorrhage from left posterior communicating artery
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is I60.32 an HCC code?
Yes. I60.32 maps to Cerebral Hemorrhage under the CMS-HCC V28 risk adjustment model (and Intracranial Hemorrhage under V24).
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 I60.32
For I60.32to 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 I60.32 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
I60.32 is the ICD-10-CM diagnosis code for nontraumatic subarachnoid hemorrhage from left posterior communicating artery. Bleeding in the space surrounding the brain caused by a ruptured blood vessel (the left posterior communicating artery) that was not caused by trauma or injury. This is a serious condition that requires immediate medical attention. I60.32 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 CMS-HCC V28 risk adjustment model, I60.32 maps to Cerebral Hemorrhage (HCC 248) with a community, non-dual, aged base RAF weight of 0.289. Under the older CMS-HCC V24 model, I60.32 maps to Intracranial Hemorrhage (HCC 99) with a community, non-dual, aged base RAF weight of 0.262. 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.
Verify the laterality (left side) is documented in the medical record before assigning this code, as it is specific to the left posterior communicating artery. Because I60.32 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 I60.32 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Verify the laterality (left side) is documented in the medical record before assigning this code, as it is specific to the left posterior communicating artery
- •Ensure the hemorrhage is documented as nontraumatic; if there is any head trauma involved, use a different code from the traumatic subarachnoid hemorrhage category (S06.0x)
Clinical Significance
Nontraumatic subarachnoid hemorrhage from the left posterior communicating artery is a lateralized neurovascular emergency. Left posterior communicating artery aneurysm rupture can cause left third nerve palsy along with subarachnoid hemorrhage. Accurate laterality documentation guides surgical approach and correlates with specific neurological findings.
Documentation Requirements
- ✓Provider must document nontraumatic subarachnoid hemorrhage from the LEFT posterior communicating artery
- ✓Imaging confirmation showing left-sided hemorrhage source
- ✓Cranial nerve examination, especially left third nerve
- ✓Aneurysm size and morphology
- ✓Neurological status and severity grading
- ✓Treatment plan and intervention approach
Commonly Confused Codes
- •I60.30 — Nontraumatic subarachnoid hemorrhage from unspecified posterior communicating artery: unspecified laterality
- •I60.31 — Nontraumatic subarachnoid hemorrhage from right posterior communicating artery: right side
- •I60.02 — Nontraumatic subarachnoid hemorrhage from left carotid siphon: different artery, same side
- •I60.12 — Nontraumatic subarachnoid hemorrhage from left middle cerebral artery: different artery, same side
- •H49.02 — Third cranial nerve palsy, left side: may be associated but is a separate code