DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

I71 Aortic aneurysm and dissection

  • Header · not billable

I71 is not billable. The category heads 31 billable codes in FY2027, grouped under 9 subdivisions.

Index → code

  • Hodgson's → I71.20
  • Fernell's disease (aortic aneurysm) → I71.9
  • Dissectionaorta → I71.00

Where it sits

  1. Chapter 9 Diseases of the circulatory system (I00-I99)
  2. I70-I79 Diseases of arteries, arterioles and capillaries (I70-I79)
  3. I71 Aortic aneurysm and dissection
Billable codes
31
Subdivisions
9
CC / MCC codes
0 / 19
HCC V28 codes
19
New FY2027
0
Index entries
83

Codes in I71

  1. I71.0
    Dissection of aorta
    Header
  2. I71.00
    Dissection of unspecified site of aorta
    BillableMCC264
  3. I71.01
    Dissection of thoracic aorta
    Header
  4. I71.010
    Dissection of ascending aorta
    BillableMCC264
  5. I71.011
    Dissection of aortic arch
    BillableMCC264
  6. I71.012
    Dissection of descending thoracic aorta
    BillableMCC264
  7. I71.019
    Dissection of thoracic aorta, unspecified
    BillableMCC264
  8. I71.02
    Dissection of abdominal aorta
    BillableMCC264
  9. I71.03
    Dissection of thoracoabdominal aorta
    BillableMCC264
  10. I71.1
    Thoracic aortic aneurysm, ruptured
    Header
  11. I71.10
    Thoracic aortic aneurysm, ruptured, unspecified
    BillableMCC264
  12. I71.11
    Aneurysm of the ascending aorta, ruptured
    BillableMCC264
  13. I71.12
    Aneurysm of the aortic arch, ruptured
    BillableMCC264
  14. I71.13
    Aneurysm of the descending thoracic aorta, ruptured
    BillableMCC264
  15. I71.2
    Thoracic aortic aneurysm, without rupture
    Header
  16. I71.20
    Thoracic aortic aneurysm, without rupture, unspecified
    Billable
  17. I71.21
    Aneurysm of the ascending aorta, without rupture
    Billable
  18. I71.22
    Aneurysm of the aortic arch, without rupture
    Billable
  19. I71.23
    Aneurysm of the descending thoracic aorta, without rupture
    Billable
  20. I71.3
    Abdominal aortic aneurysm, ruptured
    Header
  21. I71.30
    Abdominal aortic aneurysm, ruptured, unspecified
    BillableMCC264
  22. I71.31
    Pararenal abdominal aortic aneurysm, ruptured
    BillableMCC264
  23. I71.32
    Juxtarenal abdominal aortic aneurysm, ruptured
    BillableMCC264
  24. I71.33
    Infrarenal abdominal aortic aneurysm, ruptured
    BillableMCC264
  25. I71.4
    Abdominal aortic aneurysm, without rupture
    Header
  26. I71.40
    Abdominal aortic aneurysm, without rupture, unspecified
    Billable
  27. I71.41
    Pararenal abdominal aortic aneurysm, without rupture
    Billable
  28. I71.42
    Juxtarenal abdominal aortic aneurysm, without rupture
    Billable
  29. I71.43
    Infrarenal abdominal aortic aneurysm, without rupture
    Billable
  30. I71.5
    Thoracoabdominal aortic aneurysm, ruptured
    Header
  31. I71.50
    Thoracoabdominal aortic aneurysm, ruptured, unspecified
    BillableMCC264
  32. I71.51
    Supraceliac aneurysm of the thoracoabdominal aorta, ruptured
    BillableMCC264
  33. I71.52
    Paravisceral aneurysm of the thoracoabdominal aorta, ruptured
    BillableMCC264
  34. I71.6
    Thoracoabdominal aortic aneurysm, without rupture
    Header
  35. I71.60
    Thoracoabdominal aortic aneurysm, without rupture, unspecified
    Billable
  36. I71.61
    Supraceliac aneurysm of the thoracoabdominal aorta, without rupture
    Billable
  37. I71.62
    Paravisceral aneurysm of the thoracoabdominal aorta, without rupture
    Billable
  38. I71.8
    Aortic aneurysm of unspecified site, ruptured
    BillableMCC264
    Inclusion terms 1

    Inclusion terms

    • Rupture of aorta NOS
  39. I71.9
    Aortic aneurysm of unspecified site, without rupture
    Billable
    Inclusion terms 3

    Inclusion terms

    • Aneurysm of aorta
    • Dilatation of aorta
    • Hyaline necrosis of aorta

CC/MCC: as a secondary diagnosis, unless the principal diagnosis is on the code’s PDX exclusion list (MS-DRG v44 Appendix C; list on the code card).

Sources of each column.

Instructions

At I71

Code first

  • , if applicable:
  • syphilitic aortic aneurysm (A52.01) A52.01
  • traumatic aortic aneurysm (S25.09, S35.09) S25.09 S35.09

Notes that also apply

Chapter 9 instructions (Excludes2 10): printed on the chapter 9 page.

Index entries

  • Hodgson's → I71.20
  • Fernell's disease (aortic aneurysm) → I71.9
  • Dissectionaorta → I71.00
  • Hematoma (traumatic) (skin surface intact)aorta, dissecting → I71.00
  • Hodgson'sruptured → I71.10
  • Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)intrathoracic (nonsyphilitic) → I71.20
  • Disease, diseasedHodgson's → I71.20
  • Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)abdominal (aorta) → I71.40
  • Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)thoracoabdominal (aorta) → I71.60
  • Rupture, rupturedaorta, aortic → I71.8
  • Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)aorta, aortic (nonsyphilitic) → I71.9
  • Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)cylindroid (aorta) → I71.9
  • Disease, diseasedFernels' (aortic aneurysm) → I71.9
  • Dissectionaortathoracic → I71.019
  • Hematoma (traumatic) (skin surface intact)aorta, dissectingthoracic → I71.019
  • Dissectionaortaabdominal → I71.02
  • Hematoma (traumatic) (skin surface intact)aorta, dissectingabdominal → I71.02
  • Dissectionaortathoracoabdominal → I71.03
  • Hematoma (traumatic) (skin surface intact)aorta, dissectingthoracoabdominal → I71.03
  • Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)intrathoracic (nonsyphilitic)ruptured → I71.10
  • Disease, diseasedHodgson'sruptured → I71.10
  • Rupture, rupturedaorta, aorticthorax, thoracic → I71.10
  • Rupture, rupturedaorta, aorticascending → I71.11
  • Rupture, rupturedaorta, aorticarch → I71.12
  • Rupture, rupturedaorta, aortictransverse → I71.12
  • Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)aorta, aortic (nonsyphilitic)thoracic → I71.20
  • Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)aorta, aortic (nonsyphilitic)thorax, thoracic → I71.20
  • Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)aorta, aortic (nonsyphilitic)ascending → I71.21
  • Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)aorta, aortic (nonsyphilitic)arch → I71.22
  • Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)aorta, aortic (nonsyphilitic)transverse → I71.22
  • Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)abdominal (aorta)ruptured → I71.30
  • Rupture, rupturedaorta, aorticabdominal → I71.30
  • Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)aorta, aortic (nonsyphilitic)abdominal → I71.40
  • Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)abdominal (aorta)pararenal → I71.41
  • Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)abdominal (aorta)juxtarenal → I71.42
  • Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)abdominal (aorta)infrarenal → I71.43
  • Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)thoracoabdominal (aorta)ruptured → I71.50
  • Rupture, rupturedaorta, aorticthoracoabdominal → I71.50
  • Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)aorta, aortic (nonsyphilitic)thoracoabdominal → I71.60
  • Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)aorta, aortic (nonsyphilitic)ruptured → I71.8

43 more, longer entries are not listed; the search box finds them by word.

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