Hordeolum and chalazion (H00) ICD-10-CM
The H00 code range covers hordeolum and chalazion with 34 ICD-10-CM diagnosis codes. 28 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Codes in the H00 Range 34 codes · 28 billable
- H00 Hordeolum and chalazionNon-billable
- H00.0 Hordeolum (externum) (internum) of eyelidNon-billable
- H00.01 Hordeolum externumNon-billable
- H00.011 Hordeolum externum right upper eyelid
- H00.012 Hordeolum externum right lower eyelid
- H00.013 Hordeolum externum right eye, unspecified eyelid
- H00.014 Hordeolum externum left upper eyelid
- H00.015 Hordeolum externum left lower eyelid
- H00.016 Hordeolum externum left eye, unspecified eyelid
- H00.019 Hordeolum externum unspecified eye, unspecified eyelid
- H00.02 Hordeolum internumNon-billable
- H00.021 Hordeolum internum right upper eyelid
- H00.022 Hordeolum internum right lower eyelid
- H00.023 Hordeolum internum right eye, unspecified eyelid
- H00.024 Hordeolum internum left upper eyelid
- H00.025 Hordeolum internum left lower eyelid
- H00.026 Hordeolum internum left eye, unspecified eyelid
- H00.029 Hordeolum internum unspecified eye, unspecified eyelid
- H00.03 Abscess of eyelidNon-billable
- H00.031 Abscess of right upper eyelid
- H00.032 Abscess of right lower eyelid
- H00.033 Abscess of eyelid right eye, unspecified eyelid
- H00.034 Abscess of left upper eyelid
- H00.035 Abscess of left lower eyelid
- H00.036 Abscess of eyelid left eye, unspecified eyelid
- H00.039 Abscess of eyelid unspecified eye, unspecified eyelid
- H00.1 ChalazionNon-billable
- H00.11 Chalazion right upper eyelid
- H00.12 Chalazion right lower eyelid
- H00.13 Chalazion right eye, unspecified eyelid
- H00.14 Chalazion left upper eyelid
- H00.15 Chalazion left lower eyelid
- H00.16 Chalazion left eye, unspecified eyelid
- H00.19 Chalazion unspecified eye, unspecified eyelid
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the H00 range.
Chalazion
A non-neoplastic cyst of the MEIBOMIAN GLANDS of the eyelid.
Hordeolum
Purulent infection of one of the sebaceous glands of Zeis along the eyelid margin (external) or of the meibomian gland on the conjunctival side of the eyelid (internal).
Meibomian Glands
The sebaceous glands situated on the inner surface of the eyelids between the tarsal plates and CONJUNCTIVA.
About the H00 Code Range
ICD-10 code H00 covers diagnoses related to hordeolum (styes) and chalazion, common eyelid abnormalities characterized by inflammation or cyst formation. These codes specify the exact location and type of lesion affecting the eyelids, aiding precise clinical documentation.
This section includes codes for hordeolum externum (H00.01 series) and hordeolum internum (H00.02 series), distinguishing infections of the outer and inner eyelid glands. For example, H00.011 is used for a hordeolum externum on the right upper eyelid, often referred to by synonyms such as “Meibomitis” or “External hordeolum.” Abscesses of the eyelid are classified under H00.03 codes, differentiating by eyelid side and location. The H00.1 series designates chalazions, cyst-like lumps caused by blocked meibomian glands, with subcodes specifying upper or lower eyelids and right or left eyes.
These codes help medical coders accurately report conditions like styes, eyelid cysts, and eyelid abscesses to ensure clear communication and appropriate care. Using synonyms such as “Meibomitis,” “Blepharitis,” or “Conjunctival cyst” linked to specific codes supports precise billing and clinical understanding. Thus, the ICD-10 code for hordeolum and chalazion enables detailed classification of eyelid inflammations and lesions critical for eye health management.
Questions About This Page
How many billable codes are in the H00 range?
Of the 34 codes in this range, 28 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the H00 range classify?
The range classifies hordeolum and chalazion. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
