ICD-10-CM 2027
ICD-10 code for artery dissection
From the official ICD-10-CM alphabetic index entry “Dissection › artery”. Page updated September 29, 2026.
About coding artery dissection
The ICD-10-CM code for artery dissection is I77.70 (Dissection of unspecified artery). The official index lists 12 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on I77.70.
Within I77.7, choose I77.70 (unspecified artery) only when documentation doesn't support a more specific option: carotid artery (I77.71), iliac artery (I77.72), renal artery (I77.73), vertebral artery (I77.74), other precerebral arteries (I77.75), artery of upper extremity (I77.76), artery of lower extremity (I77.77) and other specified artery (I77.79).
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.
More specific artery dissection codes (official index)
- basilar (trunk) I77.75 — Dissection of other precerebral arteries
- carotid I77.71 — Dissection of carotid artery
- cerebral (nonruptured) I67.0 — Dissection of cerebral arteries, nonruptured
- ruptured
- coronary I25.42 — Coronary artery dissection
- extremity
- lower I77.77 — Dissection of artery of lower extremity
- upper I77.76 — Dissection of artery of upper extremity
- iliac I77.72 — Dissection of iliac artery
- precerebral
- congenital (nonruptured) Q28.1 — Other malformations of precerebral vessels
- specified site NEC I77.75 — Dissection of other precerebral arteries
- renal I77.73 — Dissection of renal artery
- specified NEC I77.79 — Dissection of other specified artery
- vertebral I77.74 — Dissection of vertebral artery
Common questions about artery dissection ICD-10 codes
What is the ICD-10 code for artery dissection?
- I77.70 — Dissection of unspecified artery. More specific codes apply when the documentation supports them: I77.75, I77.71, I67.0, I25.42 and others below.
What is the ICD-10 code for basilar artery dissection?
- I77.75 — Dissection of other precerebral arteries.
What is the ICD-10 code for carotid artery dissection?
- I77.71 — Dissection of carotid artery.
What is the ICD-10 code for cerebral artery dissection?
- I67.0 — Dissection of cerebral arteries, nonruptured.
What is the ICD-10 code for coronary artery dissection?
- I25.42 — Coronary artery dissection.
What is the ICD-10 code for iliac artery dissection?
- I77.72 — Dissection of iliac artery.
What is the ICD-10 code for renal artery dissection?
- I77.73 — Dissection of renal artery.
Is I77.70 billable?
- Yes. I77.70 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I77.70 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I77.70 as a principal diagnosis.
Is I77.70 a CC or MCC?
- I77.70 is an MCC (major complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.