ICD-10-CM 2027 diagnosis code
I67.7Cerebral arteritis, not elsewhere classified
I67.7 is a valid, billable ICD-10-CM code for cerebral arteritis, not elsewhere classified. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
Looking up by condition? See ICD-10 code for Cerebral arteritis.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About I67.7
I67.7 is the ICD-10-CM diagnosis code for cerebral arteritis, not elsewhere classified. It belongs to category I67 (other cerebrovascular diseases), block I60-I69 (cerebrovascular diseases) and chapter 9 (diseases of the circulatory system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
Within I67 (other cerebrovascular diseases), I67.7 is specifically for cerebral arteritis, not elsewhere classified. Related codes cover dissection of cerebral arteries, nonruptured (I67.0), cerebral aneurysm, nonruptured (I67.1), cerebral atherosclerosis (I67.2), progressive vascular leukoencephalopathy (I67.3), hypertensive encephalopathy (I67.4), Moyamoya disease (I67.5), nonpyogenic thrombosis of intracranial venous system (I67.6), other specified cerebrovascular diseases (I67.8) and 1 more.
Don't report I67.7 together with the conditions in its Excludes1 note: allergic granulomatous angiitis (M30.1).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 102 (Headaches with MCC, relative weight 1.1201) and DRG 103 (Headaches without MCC, relative weight 0.822), in MDC 01 (Diseases and Disorders of the Nervous System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Before ICD-10, this condition was coded in ICD-9-CM as 437.4 (cerebral arteritis).
Coding notes
- Granulomatous angiitis of the nervous system
- allergic granulomatous angiitis (M30.1)
Notes that apply from higher levels
Instructions written at a parent level also apply to I67.7.
Broader instructions also apply from I60-I69 Cerebrovascular diseases and Chapter 9: Diseases of the circulatory system.
Alphabetic index entries
6 entriesTerms in the official ICD-10-CM index that lead to I67.7.
Codes whose notes reference I67.7
- I77.6Excludes1
MS-DRG v44.0 grouping
All DRGs →Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.
MDC 01 · Diseases and Disorders of the Nervous System
ICD-9-CM equivalent
Converter →- 437.4Cerebral arteritisapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about I67.7
Is I67.7 billable?
- Yes. I67.7 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I67.7 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I67.7 as a principal diagnosis.
Is I67.7 a CC or MCC?
- I67.7 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.
What DRG does I67.7 group to?
- I67.7 is used in the MS-DRG v44.0 logic for MS-DRG 102 (Headaches with MCC) and MS-DRG 103 (Headaches without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.
What is the ICD-9 code for I67.7?
- The CMS General Equivalence Mappings map I67.7 to ICD-9-CM 437.4.