ICD-10-CM 2027
ICD-10 code for vascular insufficiency
From the official ICD-10-CM alphabetic index entry “Insufficiency, insufficient › vascular”. Page updated September 29, 2026.
About coding vascular insufficiency
The ICD-10-CM code for vascular insufficiency is I99.8 (Other disorder of circulatory system). The official index lists 4 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on I99.8.
Within I99, choose I99.8 (Other disorder of circulatory system) only when documentation doesn't support a more specific option: unspecified disorder of circulatory system (I99.9).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 302 (Atherosclerosis with MCC, relative weight 1.1984) and DRG 303 (Atherosclerosis without MCC, relative weight 0.6612), 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.
More specific vascular insufficiency codes (official index)
Common questions about vascular insufficiency ICD-10 codes
What is the ICD-10 code for vascular insufficiency?
- I99.8 — Other disorder of circulatory system. More specific codes apply when the documentation supports them: K55.9, K55.059, K55.1, I73.9.
What is the ICD-10 code for intestine vascular insufficiency?
- K55.9 — Vascular disorder of intestine, unspecified.
What is the ICD-10 code for mesenteric vascular insufficiency?
- K55.1 — Chronic vascular disorders of intestine.
What is the ICD-10 code for peripheral vascular insufficiency?
- I73.9 — Peripheral vascular disease, unspecified.
Is I99.8 billable?
- Yes. I99.8 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I99.8 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I99.8 as a principal diagnosis.
Is I99.8 a CC or MCC?
- No. I99.8 is neither a CC nor an MCC under MS-DRG v44.0.