H00.01

Non-Billable

ChapterH00–H59

Ranksubcategory

Official Description

Hordeolum externum

Metadata & Insights

•2026 ICD-10-CM Edition - Effective October 1, 2025.
•Non-billable category (requires more specific sub-code).
•Chapter 7: Diseases of the Eye and Adnexa (H00-H59).

Instructional Notes

Includes

Hordeolum NOS
Stye

General instructions are available for the parent sections:

View CH7 Notes View H00-H05 Notes

Clinical Hierarchy

CH7Diseases of the eye and adnexa (H00-H59)

H00-H05Disorders of eyelid, lacrimal system and orbit (H00-H05)

H00Hordeolum and chalazion

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

H00.01Hordeolum externum

H00.011Hordeolum externum right upper eyelid

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

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to H00.01:

blockH00-H05

Disorders of eyelid, lacrimal system and orbit (H00-H05)

View context instructions

chapterCH7

Diseases of the eye and adnexa (H00-H59)

View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to H00.01. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

7 raw paths

Hordeolum (eyelid) (externum) (recurrent)7 unique routes

Direct index entry→H00.01

left→H00.01(3 variants)

lower→H00.01

upper→H00.01

right→H00.01(3 variants)

lower→H00.01

upper→H00.01

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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