ICD-10 Logo
ICDxICD-10 Medical Coding
ICD-10 Logo
ICDxICD-10 Medical Coding
ICD 10 CodesDiagnoses
ICD 10 CodesDiagnoses
ICD-10 Logo
ICDxICD-10 Medical Coding

Comprehensive ICD-10-CM code reference with AI-powered search capabilities.

© 2025 ICD Code Compass. All rights reserved.

Browse

  • All Chapters
  • All Categories
  • Diagnoses

Tools

  • AI Code Search
ICD-10-CM codes are maintained by the CDC and CMS. This tool is for reference purposes only.
v1.0.0
ICD-10 Guide
ICD-10 CodesH16.21

H16.21

Non-billable

Exposure keratoconjunctivitis

BILLABLE STATUSNo
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/06/2025

Code Description

ICD-10 H16.21 is a used to indicate a diagnosis of exposure keratoconjunctivitis.

Key Diagnostic Point:

Exposure keratoconjunctivitis

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity
Exposure keratoconjunctivitis can range from mild irritation to severe inflammation, requiring careful assessment and management to prevent complications such as vision loss.

Specialty Focus

Medical Specialties

Ophthalmology

Documentation Requirements

Standard ICD-10-CM documentation requirements apply

Common Clinical Scenarios

Various clinical presentations within this specialty area

Billing Considerations

Follow specialty-specific billing guidelines

Optometry

Documentation Requirements

Standard ICD-10-CM documentation requirements apply

Common Clinical Scenarios

Various clinical presentations within this specialty area

Billing Considerations

Follow specialty-specific billing guidelines

Coding Guidelines

Inclusion Criteria

Use H16.21 When
  • Ensure accurate documentation of the patient's exposure history and symptoms
  • Use H16
  • 21 specifically for cases of keratoconjunctivitis resulting from exposure to irritants or allergens

Exclusion Criteria

Do NOT use H16.21 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

CPT Code

Clinical Scenario

Documentation Requirements

CPT Code

Clinical Scenario

Documentation Requirements

CPT Code

Clinical Scenario

Documentation Requirements

CPT Code

Clinical Scenario

Documentation Requirements

CPT Code

Clinical Scenario

Documentation Requirements

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

Accurate coding of H16.21 is crucial for appropriate reimbursement and to ensure that patients receive necessary treatment for their condition. Misclassification can lead to denied claims or inadequate care.

ICD-9 vs ICD-10

Accurate coding of H16.21 is crucial for appropriate reimbursement and to ensure that patients receive necessary treatment for their condition. Misclassification can lead to denied claims or inadequate care.

Reimbursement & Billing Impact

reimbursement and to ensure that patients receive necessary treatment for their condition. Misclassification can lead to denied claims or inadequate care.

Resources

Clinical References

  • •
    American Academy of Ophthalmology - Keratoconjunctivitis
  • •
    MedlinePlus - Conjunctivitis
  • •
    National Eye Institute - Eye Health Information

Coding & Billing References

  • •
    American Academy of Ophthalmology - Keratoconjunctivitis
  • •
    MedlinePlus - Conjunctivitis
  • •
    National Eye Institute - Eye Health Information

Frequently Asked Questions

What are the common symptoms of exposure keratoconjunctivitis?

Common symptoms include redness, itching, tearing, and a burning sensation in the eyes, often accompanied by discharge.

How is exposure keratoconjunctivitis treated?

Treatment typically involves avoiding the irritant, using artificial tears, and in some cases, topical antihistamines or corticosteroids.

When should a patient seek medical attention for keratoconjunctivitis?

Patients should seek medical attention if symptoms persist for more than a few days, worsen, or if they experience significant pain or vision changes.