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v1.0.0
ICD-10 Guide
DiagnosesIritis

Iritis

ICD-10 Coding for Iritis(H20.011, H44.121)

PRIMARY SPECIALTYOphthalmology
COMPLEXITYHigh
LAST UPDATED09/15/2025
Sam Tuffun, PT, DPT
Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Iritis?
Essential facts and insights about Iritis

Key Clinical Considerations:

  • Eye pain, redness, and photophobia
  • Slit-lamp examination revealing anterior chamber inflammation
  • Presence of cells and flare in the anterior chamber

Clinical Information

Clinical Criteria & Documentation Requirements

  • Patient history including onset and duration of symptoms
  • Findings from slit-lamp examination
  • Treatment plan and follow-up recommendations

Coding Guidelines

Usage Guidelines & Examples

  • Use H20.1 for acute cases and H20.2 for chronic cases.
  • Common errors include misclassifying acute as chronic.

Code Exclusions

Important Exclusions

  • Uveitis, posterior segment conditions
  • Other inflammatory eye diseases

Related ICD-10 Codes

Primary Codes
H20.9
Iritis, unspecified
H20.1
Iritis, acute
H20.2
Iritis, chronic
Ancillary Codes
B00.5
Differential Codes
H20.022
H20.011
H44.121
when trauma is the cause.

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Ophthalmology

Specialty Applications

  • Adults and children with ocular symptoms
  • Ophthalmology clinics and emergency departments

Coding Complexity

High Complexity

This diagnosis requires careful attention to:

  • Comprehensive clinical documentation
  • Accurate code selection based on clinical criteria
  • Proper exclusion considerations
  • Specialty-specific coding guidelines

Documentation

Documentation Templates

Billing Information

Billing Considerations

  • Ensure proper documentation for billing
  • Verify code specificity requirements
  • Check for any additional codes needed
  • Review payer-specific guidelines

Common Issues

  • Insufficient clinical documentation
  • Incorrect code selection
  • Missing supporting diagnoses
  • Timing and frequency documentation

Frequently Asked Questions

Documentation requirements?

Include detailed patient history, examination findings, and treatment plans.

Billing considerations?

Ensure accurate coding based on the type and severity of iritis.