2026 ICD-10-CM Diagnosis Code H10.9Unspecified conjunctivitis

ICD-10-CM Codes›H00–H59›H10-H11›H10

ICD-10-CM H10.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H10.9 is a billable ICD-10-CM diagnosis code for unspecified conjunctivitis. 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
H10.9
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified conjunctivitis
Short Description
Unspecified conjunctivitis
Same as the full description in the CMS dataset.
Parent Code
H10
Conjunctivitis

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH10-H11Disorders of conjunctiva
CategoryH10Conjunctivitis
This CodeH10.9Unspecified conjunctivitis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Bacterial conjunctivitis
  • Bilateral conjunctivitis
  • Bilateral infectious conjunctivitis
  • Conjunctivitis
  • Conjunctivitis associated with autoimmune skin disorder
  • Conjunctivitis associated with epidermolysis bullosa
  • Conjunctivitis caused by Bordetella pertussis
  • Conjunctivitis due to lichen planus
  • Conjunctivitis due to reactive arthritis triad
  • Conjunctivitis of bilateral eyes caused by bacteria
  • Conjunctivitis of left eye
  • Conjunctivitis of left eye caused by bacteria
  • Conjunctivitis of right eye
  • Conjunctivitis of right eye caused by bacteria
  • Follicular conjunctivitis
  • Infection caused by Bordetella
  • Infection of conjunctiva of left eye
  • Infection of conjunctiva of right eye
  • Parasitic conjunctivitis
  • Protozoal conjunctivitis
  • Rhinoconjunctivitis

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.

    • Conjunctivitis(staphylococcal) (streptococcal) NOS
    • Ophthalmia

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

  • Conjunctivitis

    inflammation of the conjunctiva.

  • Conjunctivitis, Acute Hemorrhagic

    a highly contagious disease characterized by subconjunctival hemorrhage, sudden swelling of the eyelids and congestion, redness, and pain in the eye. epidemic conjunctivitis caused by enterovirus 70 (ev-70) was first described in africa in 1969. it is caused also by coxsackievirus a24 variant (ca24v). epidemics by this organism have appeared most frequently in asia.

  • Conjunctivitis, Allergic

    conjunctivitis due to hypersensitivity to various allergens.

  • Conjunctivitis, Bacterial

    purulent infections of the conjunctiva by several species of gram-negative, gram-positive, or acid-fast organisms. some of the more commonly found genera causing conjunctival infections are haemophilus, streptococcus, neisseria, and chlamydia.

  • Conjunctivitis, Inclusion

    an infection of the eyes characterized by the presence in conjunctival epithelial cells of inclusion bodies indistinguishable from those of trachoma. it is acquired by infants during birth and by adults from swimming pools. the etiological agent is chlamydia trachomatis whose natural habitat appears to be the genito-urinary tract. inclusion conjunctivitis is a less severe disease than trachoma and usually clears up spontaneously.

  • Conjunctivitis, Viral

    inflammation, often mild, of the conjunctiva caused by a variety of viral agents. conjunctival involvement may be part of a systemic infection.

  • Chlamydia trachomatis

    type species of chlamydia causing a variety of ocular and urogenital diseases.

  • Acute Adenoviral Follicular Conjunctivitis|Acute adenoviral follicular conjunctivitis

    acute follicular conjunctivitis caused by adenovirus.

  • Acute Follicular Conjunctivitis

    follicular conjunctivitis caused by viruses and a few bacteria (e.g., chlamydia).

  • Chronic Follicular Conjunctivitis

    follicular conjunctivitis caused by chlamydia trachomatis, moraxella, borrelia, molluscum contagiosum, or toxicity from eye make-up and eye drops.

  • Follicular Conjunctivitis

    inflammation of the conjunctiva characterized by the presence of reactive lymphoid aggregates in the conjunctiva substantia propria. it presents with multiple rounded elevations of the conjunctiva.

  • Bacterial Conjunctivitis

    inflammation of the conjunctiva caused by a variety of bacterial agents.

Patient EducationClinical

Pink Eye

Conjunctivitis is the medical name for pink eye. It involves inflammation of the outer layer of the eye and inside of the eyelid. It can cause swelling, itching, burning, discharge, and redness. Causes include:

Read the full article at MedlinePlus

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

Convert H10.9 to ICD-9-CMHistory

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

ICD-9-CM
372.30 Conjunctivitis 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 H10.9Overview

Is H10.9 (Conjunctivitis) a billable code?

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

What MS-DRG does H10.9 group to?

When unspecified conjunctivitis 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 H10.9?

Under the General Equivalence Mappings, unspecified conjunctivitis converts to ICD-9-CM 372.30 (conjunctivitis 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.