ICD-10-CM 2027 diagnosis code

H00Hordeolum and chalazion

Not billable — use a more specific code

H00 is a header code, so it can't be reported by itself. Choose one of the 2 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

H00 is the ICD-10-CM diagnosis code for Hordeolum and chalazion. It belongs to 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 2 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: H00.0 (eyelid) and H00.1 (chalazion).

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

Notes that apply from higher levels

Instructions written at a parent level also apply to H00.

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

Code history

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2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about H00

Is H00 billable?: No. H00 is a header code. Report one of its more specific subcodes instead.