What does ICD-10 code H00.01 mean?

ICD-10 code H00.01 is the standardized code used for hordeolum externum in medical records and coding systems.

When is ICD-10 code H00.01 used?

Doctors, hospitals, and insurers may use ICD-10 code H00.01 when recording hordeolum externum in a standardized format. This entry may also act as a broader category that points toward more specific child codes.

Does ICD-10 code H00.01 confirm a diagnosis?

No. A code helps standardize documentation and claims, but it should not be read as a substitute for a clinician's full assessment.

ICD10

ICD-10 Code H00.01: Hordeolum externum

Name: ICD-10 Code H00.01: Hordeolum externum
Creator: HealthAssure Clinical Team
Published: 2026-05-21T06:07:27.891Z

H00.01 is an ICD-10 diagnosis entry used to group records related to Hordeolum externum. You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen. ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Diseases of the eye and adnexa (H00-H59).

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Diseases of the eye and adnexa (H00-H59).

When is it used?

May be used when a clinician documents hordeolum externum in a patient's medical record.
May appear in hospital records, claims, referrals, and clinical documentation.
This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.

What it does not mean

A code alone does not explain severity, treatment plan, or outcome.
A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
This entry may represent a broader category rather than the most specific billable code.

Code hierarchy

chapter

7Diseases of the eye and adnexa (H00-H59)

block

H00-H05Disorders of eyelid, lacrimal system and orbit

Official coding notes

Inclusion terms

Hordeolum NOS
Stye

Where you may see this code

You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.

Related specialists

Ophthalmologist

Sibling codes

H00.02Hordeolum internum H00.03Abscess of eyelid

Coding guidelines

Common synonyms

Hordeolum externum

Frequently asked questions

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.