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ICD-10-CM 2027 diagnosis code

H00.0Hordeolum (externum) (internum) of eyelid

Not billable — use a more specific code

H00.0 is a header code, so it can't be reported by itself. Choose one of the 3 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 H00.0

H00.0 is the ICD-10-CM diagnosis code for Hordeolum (externum) (internum) of eyelid. It belongs to category H00 (Hordeolum and chalazion), block H00-H05 (disorders of eyelid, lacrimal system and orbit) and chapter 7 (diseases of the eye and adnexa). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within H00 (Hordeolum and chalazion), H00.0 is specifically for Hordeolum (externum) (internum) of eyelid. Related codes cover chalazion (H00.1).

To report this condition, pick the subcode that matches the documentation: H00.01 (externum), H00.02 (internum) and H00.03 (eyelid).

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 H00.0

Notes that apply from higher levels

Instructions written at a parent level also apply to H00.0.

Broader instructions also apply from H00-H05 Disorders of eyelid, lacrimal system and orbit and Chapter 7: Diseases of the eye and adnexa.

Codes whose notes reference H00.0

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 H00.0

Is H00.0 billable?

No. H00.0 is a header code. Report one of its more specific subcodes instead.