I60.8
BillableOther nontraumatic subarachnoid hemorrhage
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is I60.8 an HCC code?
Yes. I60.8 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 I60.8
For I60.8to 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 I60.8 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
I60.8 is the ICD-10-CM diagnosis code for other nontraumatic subarachnoid hemorrhage. Bleeding in the space surrounding the brain from a nontraumatic source that doesn't fit other specific categories. I60.8 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, I60.8 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, I60.8 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.
This is a catch-all code for documented nontraumatic subarachnoid hemorrhage that doesn't match other specific codes. Because I60.8 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 I60.8 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
Clinical Significance
Other nontraumatic subarachnoid hemorrhage covers hemorrhage from sources other than the specifically listed intracranial arteries, including meningeal hemorrhage and rupture of cerebral arteriovenous malformation. This code is also used for subarachnoid hemorrhage from multiple sources or unusual vascular anomalies. These cases may have different management approaches than aneurysmal subarachnoid hemorrhage.
Documentation Requirements
- ✓Provider must document nontraumatic subarachnoid hemorrhage from an 'other' or atypical source
- ✓Specific source if known: arteriovenous malformation, dural arteriovenous fistula, meningeal vessel, or other
- ✓Imaging confirmation of the hemorrhage and its source
- ✓Neurological status assessment
- ✓Treatment plan tailored to the specific source (arteriovenous malformation treatment differs from aneurysm treatment)
- ✓Severity grading and prognosis
Commonly Confused Codes
- •I60.7 — Nontraumatic subarachnoid hemorrhage from unspecified intracranial artery: unidentified arterial source vs identified non-standard source
- •I60.6 — Nontraumatic subarachnoid hemorrhage from other intracranial arteries: specific arteries not individually listed
- •I60.00-I60.52 — Specific artery subarachnoid hemorrhage codes: when a specifically listed artery is the source
- •I61.8 — Other nontraumatic intracerebral hemorrhage: intraparenchymal, not subarachnoid
- •Q28.2 — Arteriovenous malformation of cerebral vessels: the underlying malformation, not the hemorrhage