2026 ICD-10-CM Diagnosis Code H10.012Acute follicular conjunctivitis, left eye

ICD-10-CM Codes›H00–H59›H10-H11›H10

ICD-10-CM H10.012
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H10.012 is a billable ICD-10-CM diagnosis code for acute follicular conjunctivitis, left eye. 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 acute follicular conjunctivitis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Cornea and external disease.

Code Identity

ICD-10-CM Code
H10.012
Billable Status
Yes — Valid for Submission
Code Describes
Acute follicular conjunctivitis, left eye
Short Description
Acute follicular conjunctivitis, left eye
Same as the full description in the CMS dataset.
Parent Code
H10.01
Acute follicular conjunctivitis

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH10-H11Disorders of conjunctiva
CategoryH10Conjunctivitis
This CodeH10.012Acute follicular conjunctivitis, left eye

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute follicular conjunctivitis
  • Acute follicular conjunctivitis of left eye

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

  • Acute Follicular Conjunctivitis

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

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 H10.012 to ICD-9-CMHistory

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

ICD-9-CM
372.02 Ac follic conjunctivitis
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 H10.012Overview

Is H10.012 (Acute follicular conjunctivitis) a billable code?

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

What MS-DRG does H10.012 group to?

When acute follicular conjunctivitis, left eye 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 H10.012?

Under the General Equivalence Mappings, acute follicular conjunctivitis, left eye converts to ICD-9-CM 372.02 (ac follic conjunctivitis). 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.