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ICD-10-CM 2027 diagnosis code

I77.81Aortic ectasia

Not billable — use a more specific code

I77.81 is a header code, so it can't be reported by itself. Choose one of the 4 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 I77.81

I77.81 is the ICD-10-CM diagnosis code for aortic ectasia. It belongs to category I77 (other disorders of arteries and arterioles), 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 4 subcodes must be used instead.

Within I77.8 (other specified disorders of arteries and arterioles), I77.81 is specifically for aortic ectasia. Related codes cover Antineutrophilic cytoplasmic antibody [ANCA] vasculitis (I77.82) and other specified disorders of arteries and arterioles (I77.89).

To report this condition, pick the subcode that matches the documentation: I77.810 (ectasia), I77.811 (ectasia), I77.812 (ectasia) and I77.819 (unspecified site).

Don't report I77.81 together with the conditions in its Excludes1 note: aortic aneurysm and dissection (I71.-).

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 I77.81

Coding notes

Applicable toConditions and synonyms classified to this code
  • Ectasis aorta
Excludes1Not coded here — never report together with this code
  • aortic aneurysm and dissection (I71.-)

Notes that apply from higher levels

Instructions written at a parent level also apply to I77.81.

› From I77 Other disorders of arteries and arterioles
Excludes2
  • collagen (vascular) diseases (M30-M36)
  • hypersensitivity angiitis (M31.0)
  • pulmonary artery (I28.-)

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

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 I77.81

Is I77.81 billable?

No. I77.81 is a header code. Report one of its more specific subcodes instead.