I68.2Cerebral arteritis in other diseases classified elsewhere

I68.2 is the ICD-10-CM diagnosis code for cerebral arteritis in other diseases classified elsewhere. It belongs to category I68 (cerebrovascular disorders in diseases classified elsewhere), 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 I68, choose I68.2 (Cerebral arteritis in other diseases classified elsewhere) only when documentation doesn't support a more specific option: cerebral amyloid angiopathy (I68.0) and other cerebrovascular disorders in diseases classified elsewhere (I68.8).

Don't report I68.2 together with the conditions in its Excludes1 note: listerosis (A32.89), systemic lupus erythematosus (M32.19), syphilis (A52.04) and tuberculosis (A18.89).

Code first: underlying disease.

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 is a manifestation code, so it describes the effect of an underlying disease and can't be the principal diagnosis. Code the underlying condition first.

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).