2026 ICD-10-CM Diagnosis Code H01.004Unspecified blepharitis left upper eyelid

ICD-10-CM Codes›H00–H59›H00-H05›H01

ICD-10-CM H01.004
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H01.004 is a billable ICD-10-CM diagnosis code for unspecified blepharitis left upper eyelid. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) 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
H01.004
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified blepharitis left upper eyelid
Short Description
Unspecified blepharitis left upper eyelid
Same as the full description in the CMS dataset.
Parent Code
H01.00
Unspecified blepharitis

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH00-H05Disorders of eyelid, lacrimal system and orbit
CategoryH01Other inflammation of eyelid
This CodeH01.004Unspecified blepharitis left upper eyelid

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Anterior blepharitis of left upper eyelid
  • Anterior blepharitis of left upper eyelid caused by Staphylococcus
  • Anterior blepharitis of upper eyelid
  • Bilateral blepharitis
  • Bilateral blepharitis of lower eyelids
  • Bilateral eye blepharoconjunctivitis
  • Blepharitis of bilateral upper eyelids
  • Blepharitis of left eyelid caused by staphylococcus
  • Blepharitis of left lower eyelid
  • Blepharitis of left upper and lower eyelids
  • Blepharitis of left upper eyelid
  • Blepharitis of right lower eyelid
  • Blepharitis of right upper and lower eyelids
  • Blepharitis of right upper eyelid
  • Blepharitis of upper and lower eyelids of bilateral eyes
  • Blepharitis of upper eyelid caused by Staphylococcus
  • Meibomianitis of bilateral upper and lower eyelids
  • Meibomianitis of left eyelid
  • Meibomianitis of right eyelid
  • Seborrhea faciei
  • Seborrheic blepharitis
  • Seborrheic blepharitis of left upper eyelid
  • Seborrheic blepharitis of upper eyelid
  • Staphylococcal blepharitis

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Blepharitis(angularis) (ciliaris) (eyelid) (marginal) (nonulcerative)
      • left
        • upper

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

Clinical InformationClinical

  • Blepharitis

    inflammation of the eyelids.

  • Blepharitis

    inflammation of the eyelids near the eyelashes.

Patient EducationClinical

Eyelid Disorders

Your eyelids help protect your eyes. When you blink, your eyelids spread moisture over your eyes. Blinking also helps move dirt or other particles off the surface of the eye. You close your eyelids when you see something coming toward your eyes. This can help protect against injuries.

Read the full article at MedlinePlus

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

Convert H01.004 to ICD-9-CMHistory

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

ICD-9-CM
373.00 Blepharitis NOS
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 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About H01.004Overview

Is H01.004 (Unspecified blepharitis) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report unspecified blepharitis left upper eyelid on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does H01.004 group to?

When unspecified blepharitis left upper eyelid is the principal diagnosis on an inpatient stay, it groups to MS-DRG 124, 125, with relative weights from 0.7678 to 1.3231 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of H01.004?

Under the General Equivalence Mappings, unspecified blepharitis left upper eyelid converts to ICD-9-CM 373.00 (blepharitis NOS). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.