2026 ICD-10-CM Diagnosis Code H01.9Unspecified inflammation of eyelid

ICD-10-CM Codes›H00–H59›H00-H05›H01

ICD-10-CM H01.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H01.9 is a billable ICD-10-CM diagnosis code for unspecified inflammation of 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. Coders also document this condition as collarettes of lash follicles. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Cornea and external disease and Oculofacial plastics and orbital conditions.

Code Identity

ICD-10-CM Code
H01.9
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified inflammation of eyelid
Short Description
Unspecified inflammation of eyelid
Same as the full description in the CMS dataset.
Parent Code
H01
Other inflammation of eyelid

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH00-H05Disorders of eyelid, lacrimal system and orbit
CategoryH01Other inflammation of eyelid
This CodeH01.9Unspecified inflammation of eyelid

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Collarettes of lash follicles
  • Eyelash follicle finding
  • Herpes zoster infection of eyelid
  • Infection of skin of eyelid and periocular region
  • Inflammation of eyelid
  • Inflammatory lesion of eyelid
  • Perioral dermatitis with periocular dermatitis
  • Yaws of eyelid

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Inflammation of eyelid NOS

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.

    • Dermatitis(eczematous)
      • eyelid
    • Dermatosis
      • eyelid (noninfectious)
    • Inflammation, inflamed, inflammatory(with exudation)
      • eyelid

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
CCSR EYE008
Oculofacial plastics and orbital conditions
Default principal diagnosis: inpatient No · outpatient No

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 H01.9 to ICD-9-CMHistory

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

ICD-9-CM
373.9 Inflammation eyelid NOS
Exact Match The mapping is direct, with no qualifiers.

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 H01.9Overview

Is H01.9 (Other inflammation of eyelid) a billable code?

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

What MS-DRG does H01.9 group to?

When unspecified inflammation of 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 H01.9?

Under the General Equivalence Mappings, unspecified inflammation of eyelid converts to ICD-9-CM 373.9 (inflammation eyelid NOS). The mapping is a direct match.

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.