Aortic aneurysm and dissection (I71) ICD-10-CM
The I71 code range covers aortic aneurysm and dissection with 40 ICD-10-CM diagnosis codes. 31 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Code First
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
Codes in the I71 Range 40 codes · 31 billable
- I71 Aortic aneurysm and dissectionNon-billable
- I71.0 Dissection of aortaNon-billable
- I71.00 Dissection of unspecified site of aorta
- I71.01 Dissection of thoracic aortaNon-billable
- I71.010 Dissection of ascending aorta
- I71.011 Dissection of aortic arch
- I71.012 Dissection of descending thoracic aorta
- I71.019 Dissection of thoracic aorta, unspecified
- I71.02 Dissection of abdominal aorta
- I71.03 Dissection of thoracoabdominal aorta
- I71.1 Thoracic aortic aneurysm, rupturedNon-billable
- I71.10 Thoracic aortic aneurysm, ruptured, unspecified
- I71.11 Aneurysm of the ascending aorta, ruptured
- I71.12 Aneurysm of the aortic arch, ruptured
- I71.13 Aneurysm of the descending thoracic aorta, ruptured
- I71.2 Thoracic aortic aneurysm, without ruptureNon-billable
- I71.20 Thoracic aortic aneurysm, without rupture, unspecified
- I71.21 Aneurysm of the ascending aorta, without rupture
- I71.22 Aneurysm of the aortic arch, without rupture
- I71.23 Aneurysm of the descending thoracic aorta, without rupture
- I71.3 Abdominal aortic aneurysm, rupturedNon-billable
- I71.30 Abdominal aortic aneurysm, ruptured, unspecified
- I71.31 Pararenal abdominal aortic aneurysm, ruptured
- I71.32 Juxtarenal abdominal aortic aneurysm, ruptured
- I71.33 Infrarenal abdominal aortic aneurysm, ruptured
- I71.4 Abdominal aortic aneurysm, without ruptureNon-billable
- I71.40 Abdominal aortic aneurysm, without rupture, unspecified
- I71.41 Pararenal abdominal aortic aneurysm, without rupture
- I71.42 Juxtarenal abdominal aortic aneurysm, without rupture
- I71.43 Infrarenal abdominal aortic aneurysm, without rupture
- I71.5 Thoracoabdominal aortic aneurysm, rupturedNon-billable
- I71.50 Thoracoabdominal aortic aneurysm, ruptured, unspecified
- I71.51 Supraceliac aneurysm of the thoracoabdominal aorta, ruptured
- I71.52 Paravisceral aneurysm of the thoracoabdominal aorta, ruptured
- I71.6 Thoracoabdominal aortic aneurysm, without ruptureNon-billable
- I71.60 Thoracoabdominal aortic aneurysm, without rupture, unspecified
- I71.61 Supraceliac aneurysm of the thoracoabdominal aorta, without rupture
- I71.62 Paravisceral aneurysm of the thoracoabdominal aorta, without rupture
- I71.8 Aortic aneurysm of unspecified site, ruptured
- I71.9 Aortic aneurysm of unspecified site, without rupture
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the I71 range.
Aortic Aneurysm, Abdominal
An abnormal balloon- or sac-like dilatation in the wall of the ABDOMINAL AORTA which gives rise to the visceral, the parietal, and the terminal (iliac) branches below the aortic hiatus at the diaphragm.
Aortic Aneurysm, Thoracic
An abnormal balloon- or sac-like dilatation in the wall of the THORACIC AORTA. This proximal descending portion of aorta gives rise to the visceral and the parietal branches above the aortic hiatus at the diaphragm.
Aortic Aneurysm, Thoracoabdominal
An abnormal balloon- or sac-like dilatation in the wall of ABDOMINAL AORTA at the aortic hiatus.
Aortic Dissection
A progressive tear in the tissue lining the aorta, characterized by the passage of blood from the tunica intima into, and partially through, the tunica media.
Dissection of Abdominal Aorta
Loss of integrity along the wall of the abdominal aorta.
Dissection of Thoracic Aorta
A tear within the wall of the thoracic aorta.
Dissection of Thoracoabdominal Aorta
A tear within the wall of the thoracoabdominal aorta.
Ruptured Aortic Aneurysm
A ruptured aneurysm located in the wall of the aorta.
About the I71 Code Range
Aortic aneurysm and dissection affect the aorta, an artery in the circulatory system.
I71.0 organizes dissection by aortic site. Thoracic dissections divide further into the ascending aorta, aortic arch and descending thoracic aorta.
The aneurysm codes distinguish the thoracic, abdominal and thoracoabdominal aorta, then separate ruptured aneurysms from those without rupture. More specific codes identify locations within those regions. I71.8 and I71.9 cover aneurysms of unspecified site, separated by rupture status.
Questions About This Page
How many billable codes are in the I71 range?
Of the 40 codes in this range, 31 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the I71 range classify?
The range classifies aortic aneurysm and dissection. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
