H00.01 – Hordeolum externum

ICD-10-CM 2027 diagnosis code · Disorders of eyelid, lacrimal system and orbit

Non-billable header

ICD-10-CM code H00.01

Code: H00.01 (claims format: H0001)
Description: Hordeolum externum
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 7. Diseases of the eye and adnexa (H00-H59)
Block: H00-H05 Disorders of eyelid, lacrimal system and orbit
Parent codes: H00 › H00.0

Billable codes under H00.01

H00.01 is a header code and cannot be used on claims. Choose the most specific code:

H00.011 – Hordeolum externum right upper eyelidBillable
H00.012 – Hordeolum externum right lower eyelidBillable
H00.013 – Hordeolum externum right eye, unspecified eyelidBillable
H00.014 – Hordeolum externum left upper eyelidBillable
H00.015 – Hordeolum externum left lower eyelidBillable
H00.016 – Hordeolum externum left eye, unspecified eyelidBillable
H00.019 – Hordeolum externum unspecified eye, unspecified eyelidBillable

Notes for H00.01

Applicable to:

Hordeolum NOS
Stye

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Block H00-H05

Excludes2 (not included here):

open wound of eyelid (S01.1-)
superficial injury of eyelid (S00.1-, S00.2-)

Related codes in H00.0

H00.02 – Hordeolum internumHeader
H00.03 – Abscess of eyelidHeader

Frequently asked questions

What is ICD-10 code H00.01?

H00.01 is the ICD-10-CM code for hordeolum externum, in the block H00-H05 (Disorders of eyelid, lacrimal system and orbit).

Is H00.01 a billable code?

No. H00.01 is a header code with more specific child codes; report one of the billable codes listed above.

What category does H00.01 belong to?

It belongs to category H00 – Hordeolum and chalazion.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.