2027 ICD-10-CM Diagnosis Code I68.2Cerebral arteritis in other diseases classified elsewhere

ICD-10-CM Codes›I00–I99›I60-I69›I68

ICD-10-CM I68.2
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

I68.2 is a billable ICD-10-CM diagnosis code for cerebral arteritis in other diseases classified elsewhere. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 102 through 103. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 62 closely related codes. The code is a manifestation code that cannot be reported as the principal diagnosis. Coders also document this condition as cerebral arteritis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other and ill-defined cerebrovascular disease.

Code Identity

ICD-10-CM Code
I68.2
Billable Status
Yes — Valid for Submission
Code Describes
Cerebral arteritis in other diseases classified elsewhere
Short Description
Cerebral arteritis in other diseases classified elsewhere
Same as the full description in the CMS dataset.
Parent Code
I68
Cerebrovascular disorders in diseases classified elsewhere

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI60-I69Cerebrovascular diseases
CategoryI68Cerebrovascular disorders in diseases classified elsewhere
This CodeI68.2Cerebral arteritis in other diseases classified elsewhere

Code EditsBilling

Medicare Code Editor checks that affect claim validity for I68.2.

Manifestation diagnoses
Manifestation codes describe the manifestation of an underlying disease, not the disease itself, and therefore should not be used as a principal diagnosis.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Cerebral arteritis
  • Cerebral arteritis due to infectious disease

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to I68.2: its own notes plus those printed at block I60-I69 and Chapter 9. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

On I68.2 itself
From Block I60-I69 Cerebrovascular diseases applies to 410 codes
  • 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.

From Chapter 9 (I00-I99) Diseases of the circulatory system applies to 1,433 codes
  • 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.-)

Code First

The underlying condition named in the note is sequenced before this code.

  • underlying disease

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Block I60-I69 Cerebrovascular diseases applies to 410 codes
  • code to identify presence of:
  • alcohol abuse and dependence (F10.-)
  • exposure to environmental tobacco smoke (Z77.22)
  • history of tobacco dependence (Z87.891)
  • hypertension (I10-I1A)
  • occupational exposure to environmental tobacco smoke (Z57.31)
  • tobacco dependence (F17.-)
  • tobacco use (Z72.0)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR CIR024
Other and ill-defined cerebrovascular disease
Default principal diagnosis: inpatient No · outpatient No

Patient EducationClinical

Brain Diseases

Your brain is the control center of your body. It controls your thoughts, memory, speech, and movement. It regulates the function of many organs. It's part of your nervous system, which also includes your spinal cord and peripheral nerves. The nervous system sends signals between your brain and the rest of the body.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert I68.2 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
437.4 Cerebral arteritis
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About I68.2Overview

What is the ICD-10 code for cerebral arteritis in other diseases classified elsewhere?

The ICD-10-CM code for cerebral arteritis in other diseases classified elsewhere is I68.2 (sometimes written as I682). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is I68.2 (Cerebrovascular disorders in diseases classified elsewhere) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report cerebral arteritis in other diseases classified elsewhere on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does I68.2 group to?

On inpatient claims, cerebral arteritis in other diseases classified elsewhere maps to MS-DRG 102, 103, with relative weights from 0.8219 to 1.1200 depending on complications. Higher weights mean higher Medicare reimbursement.

Is I68.2 a CC or MCC?

CMS lists I68.2 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 62 closely related codes in its exclusion list.

Can I68.2 be a principal diagnosis?

No. This is a manifestation code: cerebral arteritis in other diseases classified elsewhere describes the manifestation of an underlying disease rather than the disease itself, so the underlying condition is sequenced first.