ICD-10-CM diagnosis code
H00.021 Hordeolum internum right upper eyelid
- Billable
- Yes, a complete code (FY2026)
- Category
- H00 Hordeolum and chalazion
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Other codes in H00
28 complete codes in this category.
- H00.012Hordeolum externum right lower eyelid
- H00.013Hordeolum externum right eye, unspecified eyelid
- H00.014Hordeolum externum left upper eyelid
- H00.015Hordeolum externum left lower eyelid
- H00.016Hordeolum externum left eye, unspecified eyelid
- H00.019Hordeolum externum unspecified eye, unspecified eyelid
- H00.021Hordeolum internum right upper eyelid
- H00.022Hordeolum internum right lower eyelid
- H00.023Hordeolum internum right eye, unspecified eyelid
- H00.024Hordeolum internum left upper eyelid
- H00.025Hordeolum internum left lower eyelid
- H00.026Hordeolum internum left eye, unspecified eyelid
Documentation tips
- Make sure the note supports every element of the title, “Hordeolum internum right upper eyelid”: each detail in it should be traceable to the history, examination or assessment.
- Code to the highest specificity the documentation supports. If a detail is missing from the note, add it to the note rather than choosing a less specific code by default.
- Check the Tabular List and official guidelines for instructional notes (“code first”, “use additional code”, Excludes1/Excludes2) that apply to H00.
The international WHO ICD-10 also has H00, with its inclusion and exclusion notes; titles and detail can differ from ICD-10-CM.
ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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