I77.75Dissection of other precerebral arteries

I77.75 is the ICD-10-CM diagnosis code for dissection of other precerebral arteries. It belongs to category I77 (other disorders of arteries and arterioles), block I70-I79 (diseases of arteries, arterioles and capillaries) 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 I77.7, choose I77.75 (other precerebral arteries) only when documentation doesn't support a more specific option: unspecified artery (I77.70), carotid artery (I77.71), iliac artery (I77.72), renal artery (I77.73), vertebral artery (I77.74), artery of upper extremity (I77.76), artery of lower extremity (I77.77) and other specified artery (I77.79).

The conditions in its Excludes2 note aren't part of I77.75, but may be coded alongside it if the patient has both: aneurysm of carotid artery (I72.0), aneurysm of other precerebral arteries (I72.5), aneurysm of vertebral artery (I72.6), dissection of carotid artery (I77.71) and 1 more.

As a secondary diagnosis it is an MCC (major complication or comorbidity), which can move an inpatient stay into the highest-paying "with MCC" 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 299 (Peripheral Vascular Disorders with MCC, relative weight 1.5842), DRG 300 (Peripheral Vascular Disorders with CC, relative weight 1.0464) and DRG 301 (Peripheral Vascular Disorders without CC/MCC, relative weight 0.7133), in MDC 05 (Diseases and Disorders of the Circulatory 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 FY2017, effective October 1, 2016.

Before ICD-10, this condition was coded in ICD-9-CM as 443.29 (dissection of other artery).