2026 ICD-10-CM Diagnosis Code H01.00BUnspecified blepharitis left eye, upper and lower eyelids

ICD-10-CM Codes›H00–H59›H00-H05›H01

ICD-10-CM H01.00B
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H01.00B is a billable ICD-10-CM diagnosis code for unspecified blepharitis left eye, upper and lower eyelids. 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. Coders also document this condition as blepharitis of left lower eyelid. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Cornea and external disease.

Code Identity

ICD-10-CM Code
H01.00B
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified blepharitis left eye, upper and lower eyelids
Short Description
Unspecified blepharitis left eye, upper and lower eyelids
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 CodeH01.00BUnspecified blepharitis left eye, upper and lower eyelids

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Blepharitis of left lower eyelid
  • Blepharitis of left upper and lower eyelids
  • Blepharitis of left upper eyelid

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 and lower

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.

Code History & ChangesHistory

Replacement H01.00B replaces the following previously assigned code(s):

  • H01.004 - Unspecified blepharitis left upper eyelid
  • H01.005 - Unspecified blepharitis left lower eyelid
FY 2019AddedAdded to the ICD-10-CM code setEffective October 1, 2018.
FY 2020–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About H01.00BOverview

Is H01.00B (Unspecified blepharitis) a billable code?

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

What MS-DRG does H01.00B group to?

When unspecified blepharitis left eye, upper and lower eyelids 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.

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.