Demodex Blepharitis ICD-10 Coding Guide 2026
Demodex blepharitis is a chronic eyelid condition caused by an overgrowth of Demodex mites. Accurate ICD-10 coding is critical for Ophthalmology practices to ensure proper documentation, billing, and reimbursement. This guide provides a comprehensive overview of ICD-10 codes relevant to Demodex blepharitis, coding best practices, laterality specifications, and examples of clinical documentation.
Primary ICD-10 Code
B88.01 — Infestation by Demodex mites
Use this as the primary code when Demodex mites are clinically confirmed. Confirmation can be made through microscopy or characteristic eyelid signs such as cylindrical dandruff (collarettes) at the base of the eyelashes. B88.01 captures the underlying cause of the eyelid inflammation and ensures precise reporting for medical billing and auditing.
Secondary ICD-10 Codes for Eyelid Inflammation
Secondary codes describe the clinical manifestations of Demodex blepharitis and help coders convey the severity, eyelid location, and laterality. The H01 series is most relevant:
- H01.0 — Hordeolum and chalazion
- H01.1 — Other inflammation of eyelid
- H01.8 — Other specified inflammation of eyelid
These codes allow specification of laterality (right, left, bilateral) and indication of eyelid location (upper or lower eyelid). Using a secondary code in combination with B88.01 ensures comprehensive documentation and supports proper billing.
Laterality and Documentation Guidance
| ICD-10 Code | Description | Laterality | Example Clinical Documentation |
|---|---|---|---|
| B88.01 | Infestation by Demodex mites | Not required | “Microscopy confirmed Demodex mite infestation on both upper and lower eyelids.” |
| H01.0 | Hordeolum and chalazion | Right (OD) / Left (OS) / Bilateral (OU) | “Patient presents with right upper eyelid hordeolum secondary to Demodex infestation.” |
| H01.1 | Other inflammation of eyelid | Right / Left / Bilateral | “Left lower eyelid inflammation associated with collarettes and lash debris, consistent with Demodex blepharitis.” |
| H01.8 | Other specified inflammation of eyelid | Right / Left / Bilateral | “Bilateral eyelid inflammation with cylindrical dandruff at lash bases; Demodex confirmed on microscopy.” |
Best Practices for Coding and Documentation
- Confirm Diagnosis – Ensure that Demodex infestation is confirmed clinically or via microscopy.
- Document Clinical Findings – Include eyelid margin signs such as collarettes, crusting, lash loss, redness, and irritation.
- Specify Eyelid Laterality and Location – Right (OD), left (OS), bilateral (OU), upper or lower eyelids.
- Sequence Codes Properly – Primary: B88.01 (Demodex mite infestation); Secondary: H01 series for inflammation, with laterality.
Why Accurate Coding Matters
Accurate coding ensures proper reimbursement for Ophthalmology services, improves clinical documentation for patient records and audits, differentiates Demodex blepharitis from other types of blepharitis or eyelid disorders, and supports tracking of chronic eyelid conditions for quality reporting and follow-up care.
