ICD-10 · PDGM grouping
I71 Aortic aneurysm and dissection
All 31 codes in the I71 family, with the PDGM clinical group, comorbidity subgroup and primary-position rule CMS assigns, read from the CMS grouper crosswalk v07.2.26 and the CDC FY2027 code file.
Codes in family
31
Can lead a claim
29
Cannot lead a claim
2
What CMS assigns to I71
29 of the 31 codes group to MMTA - Cardiac and Circulatory; 2 are assigned no clinical group. 11 of the 31 count toward the Atherosclerosis, includes Peripheral Vascular Disease, Aortic Aneurysms and Hypotension comorbidity subgroup; 20 are assigned none. 29 of the 31 can lead a claim. CMS attaches a code-first note to all 31.
- Atherosclerosis, includes Peripheral Vascular Disease, Aortic Aneurysms and Hypotension: counts toward the high comorbidity tier only in an interaction pair.
Code first
CMS grouper convention 78, on all 31 codes. Code first:
- , if applicable:
- syphilitic aortic aneurysm (A52.01)
- traumatic aortic aneurysm (S25.09, S35.09)
Every code in I71
Descriptions are CDC’s FY2027 wording; where CMS’s grouper abbreviates one, its form is shown beneath.
| Code | Description | Primary position | Clinical group | Comorbidity subgroup |
|---|---|---|---|---|
| I71.0 Dissection of aorta | ||||
| I71.00 | Dissection of unspecified site of aorta | Can lead a claim, code first applies | H | None |
| I71.01 Dissection of thoracic aorta | ||||
| I71.010 | Dissection of ascending aorta | Can lead a claim, code first applies | H | None |
| I71.011 | Dissection of aortic arch | Can lead a claim, code first applies | H | None |
| I71.012 | Dissection of descending thoracic aorta | Can lead a claim, code first applies | H | None |
| I71.019 | Dissection of thoracic aorta, unspecified | Can lead a claim, code first applies | H | None |
| I71.02 | Dissection of abdominal aorta | Can lead a claim, code first applies | H | None |
| I71.03 | Dissection of thoracoabdominal aorta | Can lead a claim, code first applies | H | None |
| I71.1 Thoracic aortic aneurysm, ruptured | ||||
| I71.10 | Thoracic aortic aneurysm, ruptured, unspecified | Can lead a claim, code first applies | H | None |
| I71.11 | Aneurysm of the ascending aorta, ruptured | Can lead a claim, code first applies | H | None |
| I71.12 | Aneurysm of the aortic arch, ruptured | Can lead a claim, code first applies | H | None |
| I71.13 | Aneurysm of the descending thoracic aorta, ruptured | Can lead a claim, code first applies | H | None |
| I71.2 Thoracic aortic aneurysm, without rupture | ||||
| I71.20 | Thoracic aortic aneurysm, without rupture, unspecified | Can lead a claim, code first applies | H | Atherosclerosis, includes Peripheral Vascular Disease, Aortic Aneurysms and Hypotension |
| I71.21 | Aneurysm of the ascending aorta, without rupture | Can lead a claim, code first applies | H | Atherosclerosis, includes Peripheral Vascular Disease, Aortic Aneurysms and Hypotension |
| I71.22 | Aneurysm of the aortic arch, without rupture | Can lead a claim, code first applies | H | Atherosclerosis, includes Peripheral Vascular Disease, Aortic Aneurysms and Hypotension |
| I71.23 | Aneurysm of the descending thoracic aorta, without rupture | Can lead a claim, code first applies | H | Atherosclerosis, includes Peripheral Vascular Disease, Aortic Aneurysms and Hypotension |
| I71.3 Abdominal aortic aneurysm, ruptured | ||||
| I71.30 | Abdominal aortic aneurysm, ruptured, unspecified | Can lead a claim, code first applies | H | None |
| I71.31 | Pararenal abdominal aortic aneurysm, ruptured | Can lead a claim, code first applies | H | None |
| I71.32 | Juxtarenal abdominal aortic aneurysm, ruptured | Can lead a claim, code first applies | H | None |
| I71.33 | Infrarenal abdominal aortic aneurysm, ruptured | Can lead a claim, code first applies | H | None |
| I71.4 Abdominal aortic aneurysm, without rupture | ||||
| I71.40 | Abdominal aortic aneurysm, without rupture, unspecified | Can lead a claim, code first applies | H | Atherosclerosis, includes Peripheral Vascular Disease, Aortic Aneurysms and Hypotension |
| I71.41 | Pararenal abdominal aortic aneurysm, without rupture | Can lead a claim, code first applies | H | Atherosclerosis, includes Peripheral Vascular Disease, Aortic Aneurysms and Hypotension |
| I71.42 | Juxtarenal abdominal aortic aneurysm, without rupture | Can lead a claim, code first applies | H | Atherosclerosis, includes Peripheral Vascular Disease, Aortic Aneurysms and Hypotension |
| I71.43 | Infrarenal abdominal aortic aneurysm, without rupture | Can lead a claim, code first applies | H | Atherosclerosis, includes Peripheral Vascular Disease, Aortic Aneurysms and Hypotension |
| I71.5 Thoracoabdominal aortic aneurysm, ruptured | ||||
| I71.50 | Thoracoabdominal aortic aneurysm, ruptured, unspecified | Can lead a claim, code first applies | H | None |
| I71.51 | Supraceliac aneurysm of the thoracoabdominal aorta, ruptured | Can lead a claim, code first applies | H | None |
| I71.52 | Paravisceral aneurysm of the thoracoabdominal aorta, rupturedCMS: Paravisceral aneurysm of the thoracoabdominal aorta, ruptd | Can lead a claim, code first applies | H | None |
| I71.6 Thoracoabdominal aortic aneurysm, without rupture | ||||
| I71.60 | Thoracoabdominal aortic aneurysm, without rupture, unspecifiedCMS: Thoracoabdominal aortic aneurysm, without rupture, unsp | Can lead a claim, code first applies | H | Atherosclerosis, includes Peripheral Vascular Disease, Aortic Aneurysms and Hypotension |
| I71.61 | Supraceliac aneurysm of the thoracoabdominal aorta, without ruptureCMS: Supraceliac aneurysm of the thoracoabdominal aorta, w/o rupt | Can lead a claim, code first applies | H | Atherosclerosis, includes Peripheral Vascular Disease, Aortic Aneurysms and Hypotension |
| I71.62 | Paravisceral aneurysm of the thoracoabdominal aorta, without ruptureCMS: Paravisceral aneurysm of thoracoabdominal aorta, w/o rupt | Can lead a claim, code first applies | H | Atherosclerosis, includes Peripheral Vascular Disease, Aortic Aneurysms and Hypotension |
| I71.8 | Aortic aneurysm of unspecified site, ruptured | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| I71.9 | Aortic aneurysm of unspecified site, without rupture | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
Sources: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01, for the clinical group, comorbidity subgroup, code-first conventions and primary-position flags; CDC NCHS ICD-10-CM FY2027 code descriptions for the family title and code wording. This is the crosswalk Medicare runs a claim through. Grouping also depends on admission source, timing, the OASIS functional items and the rest of the diagnosis list.
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