I67.1 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC coding software

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Code lookupI67.1

Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Diseases of the circulatory system (I00-I99) / Cerebrovascular diseases (I60-I69)

I67.1

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Cerebral aneurysm, nonruptured

A weakened, bulging area in a brain artery wall that has not burst, which carries risk of future rupture and stroke.

Overview Risk Models Code Book Documentation Audit Notes Edition comparison

CMS-HCC V28

N/A

—

Not risk-adjusted for this model/period.

Not mapped

CMS-HCC V24

Historical

Not used for standard CY2026 Medicare Advantage payment. Select a historical period to review V24.

Not used for CY2026 payment

ACA/HHS

Mapped

HCC 149

HHS-HCC 149 adult, RAF varies...

Code-level coefficient reference

ESRD/PACE

N/A

—

Not risk-adjusted for this model/period.

Not mapped

RXHCC

N/A

—

Not risk-adjusted for this model/period.

Not mapped

Code Book Path

Official

I67Other cerebrovascular diseases I67.1Cerebral aneurysm, nonruptured

Inclusion Terms

Official

Cerebral aneurysm NOS
Cerebral arteriovenous fistula, acquired
Internal carotid artery aneurysm, intracranial portion
Internal carotid artery aneurysm, NOS

Excludes 2

Official

certain conditions originating in the perinatal period (P04-P96)Inherited from I00-I99, I67
certain infectious and parasitic diseases (A00-B99)Inherited from I00-I99, I67
complications of pregnancy, childbirth and the puerperium (O00-O9A)Inherited from I00-I99, I67
congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)Inherited from I00-I99, I67
endocrine, nutritional and metabolic diseases (E00-E88)Inherited from I00-I99, I67
injury, poisoning and certain other consequences of external causes (S00-T88)Inherited from I00-I99, I67
neoplasms (C00-D49)Inherited from I00-I99, I67
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)Inherited from I00-I99, I67
systemic connective tissue disorders (M30-M36)Inherited from I00-I99, I67
transient cerebral ischemic attacks and related syndromes (G45.-)Inherited from I00-I99, I67
sequelae of the listed conditions (I69.8)Inherited from I00-I99, I67

Related Codes

Official

I67.0Dissection of cerebral arteries, nonruptured I67.2Cerebral atherosclerosis I67.3Progressive vascular leukoencephalopathy I67.4Hypertensive encephalopathy I67.5Moyamoya disease

Includes

Official

No Includes notes are included in this display for I67.1. Check the code and parent instructions in the Code Book.

Excludes 1

Official

congenital cerebral aneurysm, nonruptured (Q28.-)
ruptured cerebral aneurysm (I60.7)
traumatic intracranial hemorrhage (S06.-)Inherited from I60-I69, I67
Occlusion and stenosis of cerebral artery causing cerebral infarction (I63.3-I63.5-)Inherited from I60-I69, I67
Occlusion and stenosis of precerebral artery causing cerebral infarction (I63.2-)Inherited from I60-I69, I67

Code First

Official

No Code First sequencing instructions are included in this display for I67.1. Check the code and parent instructions in the Code Book.

Use Additional

Official

code to identify presence of:Inherited from I60-I69
alcohol abuse and dependence (F10.-)Inherited from I60-I69
exposure to environmental tobacco smoke (Z77.22)Inherited from I60-I69
history of tobacco dependence (Z87.891)Inherited from I60-I69
hypertension (I10-I1A)Inherited from I60-I69
occupational exposure to environmental tobacco smoke (Z57.31)Inherited from I60-I69
tobacco dependence (F17.-)Inherited from I60-I69
tobacco use (Z72.0)Inherited from I60-I69

Code Also

Official

No Code Also instructions are included in this display for I67.1. Check the code and parent instructions in the Code Book.

Buddy Documentation Tip

HCC Buddy guidance

Ensure documentation specifies 'nonruptured'; ruptured aneurysms use different codes

Note the location, size, and any treatment planned or performed

Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →

Is I67.1 an HCC code?

Code: I67.1
Description: Cerebral aneurysm, nonruptured
HCC (V28): No CMS-HCC V28 mapping
RAF reference coefficient: —
Billable: Yes
Payment year: 2026

Coder workflow notes

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What This Code Means

I67.1 is the ICD-10-CM diagnosis code for cerebral aneurysm, nonruptured. A weakened, bulging area in a brain artery wall that has not burst, which carries risk of future rupture and stroke. I67.1 sits in the ICD-10-CM chapter for diseases of the circulatory system (i00-i99), within the section covering cerebrovascular diseases (i60-i69).

I67.1 has no mapping under the current CMS-HCC V28 community payment model. I67.1 also appears in the HHS-HCC commercial risk model (HCC 149 (HHS-HCC 149 adult, RAF varies by metal level)), which is a commercial market model rather than a Medicare Advantage payment mapping. Do not assign V28 risk adjustment value from this page; verify the applicable model and payment year before using this code for risk adjustment.

Ensure documentation specifies 'nonruptured'; ruptured aneurysms use different codes.

HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for I67.1 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.