2027 ICD-10-CM Diagnosis Code I60.8Other nontraumatic subarachnoid hemorrhage
ICD-10-CM Codes›I00–I99›I60-I69›I60
- Billable — Valid for Submission
- MCC — Major Complication or Comorbidity
- Risk Adjusts — HCC 248
- Chronic Condition
I60.8 is a billable ICD-10-CM diagnosis code for other nontraumatic subarachnoid hemorrhage. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 20 through 24, 64 through 66, 791, 793. As a secondary diagnosis, it counts as a major complication or comorbidity (MCC) and places an inpatient stay in the highest severity level of its MS-DRG family. It does not count, however, when the principal diagnosis is one of 306 closely related codes. Coders also document this condition as acquired aneurysm of cerebral artery. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Acute hemorrhagic cerebrovascular disease.
For Medicare Advantage risk adjustment, I60.8 maps to CMS-HCC Category 248 (Intracranial Hemorrhage) under the V28 model, adding a risk factor of about 0.239 for a community, non-dual, aged beneficiary in payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
I60.8 maps to a payment category in the CMS-HCC model used to risk-adjust Medicare Advantage payments. Weights are the published community factors for payment year 2027.
Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Acquired aneurysm of cerebral artery
- Arteriovenous fistula hemorrhage
- Congenital arteriovenous fistula hemorrhage
- Meningeal hemorrhage
- Neurovascular injury
- Perimesencephalic subarachnoid hemorrhage
- Ruptured acquired aneurysm of cerebral artery
- Ruptured aneurysm of intracranial artery
- Subarachnoid hemorrhage due to ruptured arteriovenous malformation
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to I60.8: its own notes plus those printed at I60, block I60-I69, and Chapter 9. A note printed at a category, block or chapter applies to every code under it.
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Meningeal hemorrhage
- Rupture of cerebral arteriovenous malformation
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
- syphilitic ruptured cerebral aneurysm (A52.05)
- traumatic intracranial hemorrhage (S06.-)
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- sequelae of subarachnoid hemorrhage (I69.0-)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
- systemic connective tissue disorders (M30-M36)
- transient cerebral ischemic attacks and related syndromes (G45.-)
Use Additional Code
Add a second code, after this one, to fully describe the condition.
- code, if known, to indicate National Institutes of Health Stroke Scale (NIHSS) score (R29.7-)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name I60.8, its category, or a range that includes it.
Excludes1 1
These codes carry an Excludes1 note naming I60.8: they are not reported together with it, unless the two conditions are unrelated.
- Q28 Other congenital malformations of circulatory systemruptured cerebral arteriovenous malformation (I60.8)
Code First 1
These codes say to code first a condition named in the note, and I60.8 is one of the conditions named.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
arteriovenous ruptured brain I60.8
subarachnoid I60.8
Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular) I72.9
arteriovenous (congenital) See Also: Malformation, arteriovenous;
ruptured I60.8
subarachnoid I60.8
Malformation (congenital) See Also: Anomaly;
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Hemorrhagic Stroke
A stroke happens when there is a loss of blood flow to part of the brain. Your brain cells cannot get the oxygen and nutrients they need from blood, and they start to die within a few minutes. This can cause lasting brain damage, long-term disability, or even death.
The full article covers:
- What is a hemorrhagic stroke?
- What are the types of hemorrhagic stroke?
- What causes hemorrhagic stroke?
- What are the symptoms of a hemorrhagic stroke?
- How is a hemorrhagic stroke diagnosed?
- How is hemorrhagic stroke treated?
- Can a hemorrhagic stroke be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert I60.8 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About I60.8Overview
What is the ICD-10 code for other nontraumatic subarachnoid hemorrhage?
The ICD-10-CM code for other nontraumatic subarachnoid hemorrhage is I60.8 (sometimes written as I608). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is I60.8 (Nontraumatic subarachnoid hemorrhage) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other nontraumatic subarachnoid hemorrhage on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does I60.8 group to?
When other nontraumatic subarachnoid hemorrhage is the principal diagnosis on an inpatient stay, it groups to MS-DRG 793, 791, 24, 64, 22, 23, 65, 21, 20, 66, with relative weights from 0.6770 to 7.9594 depending on complications. Higher weights mean higher Medicare reimbursement.
Is I60.8 a CC or MCC?
CMS lists I60.8 as an MCC (major complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it places the inpatient stay in the highest-weighted DRG of its severity family. It does not count when the principal diagnosis is one of the 306 closely related codes in its exclusion list.
Can I60.8 be reported with A52.05?
Not as a rule. The Excludes1 note at I60, which applies to I60.8, lists "syphilitic ruptured cerebral aneurysm (A52.05)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
What HCC is I60.8?
I60.8 (other nontraumatic subarachnoid hemorrhage) maps to CMS-HCC Category 248 (Intracranial Hemorrhage), commonly written as HCC 248, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2027. It mapped to HCC 99 under the retired V24 model. It also maps in the PACE (CMS-HCC V22), ESRD (V21), and ESRD (V24) models. It does not map to any RxHCC in the Part D prescription drug model.
Does I60.8 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, I60.8 adds a risk adjustment factor of about 0.239 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.081 to 0.377 depending on the payment segment). HCC 248 sits at the top of its hierarchy, so no other condition category supersedes it. See the full factor table on the HCC 248 category page.
