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ICD-10-CM 2027 diagnosis code

I71Aortic aneurysm and dissection

Not billable — use a more specific code

I71 is a header code, so it can't be reported by itself. Choose one of the 9 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About I71

I71 is the ICD-10-CM diagnosis code for aortic aneurysm and dissection. It belongs to block I70-I79 (diseases of arteries, arterioles and capillaries) and chapter 9 (diseases of the circulatory system). It is a header code, so it can't be reported by itself; one of its 9 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: I71.0 (aorta), I71.1 (ruptured), I71.2 (rupture), I71.3 (ruptured), I71.4 (rupture), I71.5 (ruptured), I71.6 (rupture), I71.8 (ruptured) and 1 more.

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

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under I71

Coding notes

Code firstSequence the underlying condition first
  • , if applicable:
  • syphilitic aortic aneurysm (A52.01)
  • traumatic aortic aneurysm (S25.09, S35.09)

Notes that apply from higher levels

Instructions written at a parent level also apply to I71.

Broader instructions also apply from Chapter 9: Diseases of the circulatory system.

Codes whose notes reference I71

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about I71

Is I71 billable?

No. I71 is a header code. Report one of its more specific subcodes instead.