ICD-10-CM 2027
ICD-10 code for aorta dissection
Dissection of unspecified site of aorta
From the official ICD-10-CM alphabetic index entry “Dissection › aorta”. Page updated September 29, 2026.
About coding aorta dissection
The ICD-10-CM code for aorta dissection is I71.00 (Dissection of unspecified site of aorta). The official index lists 6 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on I71.00.
Within I71.0, choose I71.00 (unspecified site of aorta) only when documentation doesn't support a more specific option: thoracic aorta (I71.01), abdominal aorta (I71.02) and thoracoabdominal aorta (I71.03).
Code first , if applicable: syphilitic aortic aneurysm (A52.01) and traumatic aortic aneurysm (S25.09, S35.09).
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.
More specific aorta dissection codes (official index)
- abdominal I71.02 — Dissection of abdominal aorta
- thoracic I71.019 — Dissection of thoracic aorta, unspecified
- aortic arch I71.011 — Dissection of aortic arch
- ascending aorta I71.010 — Dissection of ascending aorta
- descending thoracic aorta I71.012 — Dissection of descending thoracic aorta
- thoracoabdominal I71.03 — Dissection of thoracoabdominal aorta
Common questions about aorta dissection ICD-10 codes
What is the ICD-10 code for aorta dissection?
- I71.00 — Dissection of unspecified site of aorta. More specific codes apply when the documentation supports them: I71.02, I71.019, I71.011, I71.010 and others below.
What is the ICD-10 code for abdominal aorta dissection?
- I71.02 — Dissection of abdominal aorta.
What is the ICD-10 code for thoracic aorta dissection?
- I71.019 — Dissection of thoracic aorta, unspecified.
What is the ICD-10 code for thoracoabdominal aorta dissection?
- I71.03 — Dissection of thoracoabdominal aorta.
Is I71.00 billable?
- Yes. I71.00 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I71.00 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I71.00 as a principal diagnosis.
Is I71.00 a CC or MCC?
- I71.00 is an MCC (major complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.