ICD10BillableValid for clinical use
ICD-10 Code H10.422: Simple chronic conjunctivitis, left eye
Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026
What is this code?
ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Diseases of the eye and adnexa (H00-H59).
When is it used?
- May be used when a clinician documents simple chronic conjunctivitis, left eye in a patient's medical record.
- May appear in hospital records, claims, referrals, and clinical documentation.
- This code can be used as a clinically usable diagnosis entry in standardized coding workflows.
What it does not mean
- A code alone does not explain severity, treatment plan, or outcome.
- A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
Code hierarchy
chapter
7Diseases of the eye and adnexa (H00-H59)
block
H10-H11Disorders of conjunctiva
category
H10Conjunctivitis
category
H10.4Chronic conjunctivitis
category
H10.42Simple chronic conjunctivitis
currentH10.42
Where you may see this code
You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.
Related specialists
Ophthalmologist
Related codes
Sibling codes
Coverage-related procedures and services
CPT 68801high
DILATION OF LACRIMAL PUNCTUM, WITH OR WITHOUT IRRIGATION
Source: CMS coverage guidance
CPT 92285high
EXTERNAL OCULAR PHOTOGRAPHY WITH INTERPRETATION AND REPORT FOR DOCUMENTATION OF MEDICAL PROGRESS (EG, CLOSE-UP PHOTOGRAPHY, SLIT LAMP PHOTOGRAPHY, GONIOPHOTOGRAPHY, STEREO-PHOTOGRAPHY)
Source: CMS coverage guidance
CPT 68840high
PROBING OF LACRIMAL CANALICULI, WITH OR WITHOUT IRRIGATION
Source: CMS coverage guidance
CPT 68810high
PROBING OF NASOLACRIMAL DUCT, WITH OR WITHOUT IRRIGATION;
Source: CMS coverage guidance
CPT 68811high
PROBING OF NASOLACRIMAL DUCT, WITH OR WITHOUT IRRIGATION; REQUIRING GENERAL ANESTHESIA
Source: CMS coverage guidance
CPT 68815high
PROBING OF NASOLACRIMAL DUCT, WITH OR WITHOUT IRRIGATION; WITH INSERTION OF TUBE OR STENT
Source: CMS coverage guidance
Coding guidelines
Common synonyms
Simple chronic conjunctivitis, left eye
Frequently asked questions
About this content
This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.