ICD-10-CM 2027 diagnosis code
I67.850Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy
I67.850 is a valid, billable ICD-10-CM code for cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Cereb autosom dom artopath w subcort infarcts & leukoenceph
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Code last changed in FY2019 (effective October 1, 2018). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About I67.850
I67.850 is the ICD-10-CM diagnosis code for cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy. 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 I67.85 (hereditary cerebrovascular diseases), I67.850 is specifically for cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy. Related codes cover other hereditary cerebrovascular disease (I67.858).
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 070 (Other Cerebrovascular Disorders with MCC, relative weight 1.6093), DRG 071 (Other Cerebrovascular Disorders with CC, relative weight 1.0177) and DRG 072 (Other Cerebrovascular Disorders without CC/MCC, relative weight 0.7348), 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 was added in FY2019, effective October 1, 2018.
Coding notes
Notes that apply from higher levels
Instructions written at a parent level also apply to I67.850.
Broader instructions also apply from I60-I69 Cerebrovascular diseases and Chapter 9: Diseases of the circulatory system.
Alphabetic index entries
2 entriesTerms in the official ICD-10-CM index that lead to I67.850.
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
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2019 (effective 10/1/2018): Added
- No changes since FY2019.
Common questions about I67.850
Is I67.850 billable?
- Yes. I67.850 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I67.850 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I67.850 as a principal diagnosis.
Is I67.850 a CC or MCC?
- I67.850 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.
What DRG does I67.850 group to?
- I67.850 is used in the MS-DRG v44.0 logic for MS-DRG 070 (Other Cerebrovascular Disorders with MCC), MS-DRG 071 (Other Cerebrovascular Disorders with CC) and MS-DRG 072 (Other Cerebrovascular Disorders without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.