2027 ICD-10-CM Diagnosis Code H00.012Hordeolum externum right lower eyelid

ICD-10-CM Codes›H00–H59›H00-H05›H00

ICD-10-CM H00.012
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

H00.012 is a billable ICD-10-CM diagnosis code for hordeolum externum right lower eyelid. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 124 through 125. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Cornea and external disease.

Code Identity

ICD-10-CM Code
H00.012
Billable Status
Yes — Valid for Submission
Code Describes
Hordeolum externum right lower eyelid
Short Description
Hordeolum externum right lower eyelid
Same as the full description in the CMS dataset.
Parent Code
H00.01
Hordeolum externum

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH00-H05Disorders of eyelid, lacrimal system and orbit
CategoryH00Hordeolum and chalazion
This CodeH00.012Hordeolum externum right lower eyelid

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Bilateral blepharitis
  • Bilateral eye blepharoconjunctivitis
  • Bilateral meibomianitis of lower eyelids
  • External hordeolum
  • Hordeolum externum of lower eyelid
  • Hordeolum externum of lower eyelid of right eye
  • Meibomianitis of left eyelid
  • Meibomianitis of left lower eyelid
  • Meibomianitis of right eyelid
  • Meibomianitis of right lower eyelid
  • Meibomitis of right upper and lower eyelid
  • Meibomitis of right upper eyelid

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to H00.012: its own notes plus those printed at block H00-H05 and Chapter 7. A note printed at a category, block or chapter applies to every code under it.

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Block H00-H05 Disorders of eyelid, lacrimal system and orbit applies to 574 codes
From Chapter 7 (H00-H59) Diseases of the eye and adnexa applies to 2,677 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • diabetes mellitus related eye conditions (E09.3-, E10.3-, E11.3-, E13.3-)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury (trauma) of eye and orbit (S05.-)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • syphilis related eye disorders (A50.01, A50.3-, A51.43, A52.71)

Notes

General instructions on how these codes are used.

From Chapter 7 (H00-H59) Diseases of the eye and adnexa applies to 2,677 codes
  • Use an external cause code following the code for the eye condition, if applicable, to identify the cause of the eye condition

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name H00.012, its category, or a range that includes it.

Excludes2 4

These codes carry an Excludes2 note naming H00.012: its condition is not part of those codes, and both may be reported when the patient has both.

  • Block L00-L08 Infections of the skin and subcutaneous tissue
    hordeolum (H00.0) names H00.0, which includes this code
  • L02.0 Cutaneous abscess, furuncle and carbuncle of face
    abscess of eyelid (H00.0) names H00.0, which includes this code
  • L03 Cellulitis and acute lymphangitis
    cellulitis of eyelid (H00.0) names H00.0, which includes this code
  • L03.211 Cellulitis of face
    cellulitis of eyelid (H00.0-) names H00.0-, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR EYE001
Cornea and external disease
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Eyelid Disorders

Eyelid disorders include a variety of conditions that affect your eyelids. Your eyelids protect your eyes and help keep them healthy. When you blink, they spread tears across your eyes and help wash away dirt or dust. You also close your eyelids when something comes near your eyes to protect them from injury.

The full article covers:

  • What are eyelid disorders?
  • What causes eyelid disorders?
  • What are common eyelid disorders?
  • What are the symptoms of eyelid disorders?
  • How are eyelid disorders diagnosed?
  • How are eyelid disorders treated?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert H00.012 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
373.11 Hordeolum externum
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About H00.012Overview

What is the ICD-10 code for hordeolum externum right lower eyelid?

The ICD-10-CM code for hordeolum externum right lower eyelid is H00.012 (sometimes written as H00012). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is H00.012 (Hordeolum externum) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report hordeolum externum right lower eyelid on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does H00.012 group to?

When hordeolum externum right lower eyelid is the principal diagnosis on an inpatient stay, it groups to MS-DRG 125, 124, with relative weights from 0.7699 to 1.2470 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of H00.012?

Under the General Equivalence Mappings, hordeolum externum right lower eyelid converts to ICD-9-CM 373.11 (hordeolum externum). The mapping is approximate, so confirm the match fits the documentation.