On this page
- What Are Ophthalmology ICD-10 Codes?
- Which ICD-10 Chapters Do Eye Practices Use?
- Which ICD-10 Codes Do Eye Practices Use Most?
- How Does Laterality Work in Eye Codes?
- Which Eye Codes Need a Stage or 7th Character?
- How Do ICD-10 Codes Decide Whether a Test or Procedure Pays?
- Which Detailed ICD-10 Guides Cover Each Condition?
- Why Do Eye Care Diagnosis Codes Cause Denials?
- How Are Routine and Medical Eye Exams Coded Differently?
Key takeaways
- Most eye diagnoses come from chapter 7 of ICD-10-CM, codes H00 to H59, while diabetic retinopathy uses E08 to E13.
- Most eye codes carry laterality, with 1 for the right eye, 2 for the left, 3 for both eyes and 9 for unspecified.
- Glaucoma, macular degeneration and diabetic retinopathy codes add a character for stage or eye, and a missing character makes the code invalid.
- Codes change every October 1, so practices update their code lists and templates each fall.
What Are Ophthalmology ICD-10 Codes?
Ophthalmology ICD-10 codes are ICD-10-CM diagnosis codes that report the eye condition behind every visit, test and procedure on a claim. The CPT code says what was done, and the ICD-10 code says why it was medically necessary.
ICD-10-CM is maintained by the National Center for Health Statistics and published with official guidelines by CMS. Codes are 3 to 7 characters long. The first 3 characters name the condition category, and the later characters add detail such as type, eye and stage. A code is billable only at its full length, so H40.11 alone is a header and H40.1131 is a complete code.
Which ICD-10 Chapters Do Eye Practices Use?
Eye practices code most diagnoses from chapter 7 (H00 to H59), with diabetic eye disease, injuries and routine exams coded from 3 other chapters. The table shows where each group of eye care diagnoses lives.
| Chapter | Code range | Eye care use |
|---|---|---|
| Chapter 7, Diseases of the Eye and Adnexa | H00 to H59 | Glaucoma, cataract, retina, cornea, eyelid and orbit conditions |
| Chapter 4, Endocrine and Metabolic | E08 to E13 | Diabetic retinopathy and diabetic macular edema |
| Chapter 19, Injury and Poisoning | S05, T15, T85 | Eye injuries, foreign bodies and implant complications |
| Chapter 21, Factors Influencing Health Status | Z01.0, Z96.1, Z79 | Routine exams, pseudophakia and high-risk medication monitoring |
Chapter 7 is the starting point for most visits, but a diabetic patient's retinopathy is always coded from chapter 4, never from H35.
Which ICD-10 Codes Do Eye Practices Use Most?
Glaucoma, cataract, macular degeneration, diabetic retinopathy, dry eye and eyelid codes cover most claims in a general ophthalmology or optometry practice. The table lists the common code families with an example of a complete code.
| Condition | Code family | Complete code example |
|---|---|---|
| Primary open-angle glaucoma | H40.11- | H40.1131, both eyes, mild stage |
| Glaucoma suspect, open angle | H40.01-, H40.02- | H40.013, borderline findings, low risk, both eyes |
| Age-related nuclear cataract | H25.1- | H25.11, right eye |
| Dry macular degeneration | H35.31- | H35.3112, right eye, intermediate stage |
| Wet macular degeneration | H35.32- | H35.3221, left eye, active choroidal neovascularization |
| Type 2 diabetes with retinopathy | E11.3- | E11.3293, mild nonproliferative, no macular edema, both eyes |
| Dry eye syndrome | H04.12- | H04.123, both lacrimal glands |
| Dermatochalasis | H02.83- | H02.831, right upper eyelid |
| Posterior capsule opacification | H26.49- | H26.491, right eye |
| Pseudophakia | Z96.1 | Z96.1, lens implant present |
Each family has more codes than the example shows. Macular degeneration ICD-10 codes, for example, split into more than 30 complete codes by type, eye and stage.
How Does Laterality Work in Eye Codes?
Most eye codes name the eye in the 5th or 6th character, with 1 for the right eye, 2 for the left, 3 for both eyes and 9 for an unspecified eye. The eye in the diagnosis should match the RT or LT modifier on the procedure line.
Eyelid codes follow a different pattern because each eye has 2 lids. These values apply to eyelid codes such as dermatochalasis (H02.83-) and ptosis (H02.4-).
- 1 for the right upper eyelid and 2 for the right lower eyelid
- 4 for the left upper eyelid and 5 for the left lower eyelid
- 3 and 6 for an unspecified eyelid of the right or left eye
When should the bilateral code be used?
Use the bilateral code when both eyes have the same condition at the same stage. When the eyes have different types or stages, code each eye on its own, such as dry macular degeneration in one eye and wet in the other.
Which Eye Codes Need a Stage or 7th Character?
Glaucoma, macular degeneration and diabetic retinopathy codes need a final character for stage or eye, and the code is invalid without it. These are the 3 groups that cause the most incomplete-code rejections.
| Code family | What the last character shows | Values |
|---|---|---|
| Open-angle, chronic angle-closure and secondary glaucoma (H40.1-, H40.22-, H40.3- to H40.6-) | Stage | 0 unspecified, 1 mild, 2 moderate, 3 severe, 4 indeterminate |
| Dry macular degeneration (H35.31-) | Stage | 0 unspecified, 1 early, 2 intermediate, 3 advanced atrophic without subfoveal involvement, 4 advanced atrophic with subfoveal involvement |
| Wet macular degeneration (H35.32-) | Stage | 0 unspecified, 1 active neovascularization, 2 inactive neovascularization, 3 inactive scar |
| Diabetic retinopathy with a named type (E08.32- to E13.35-) | Eye | 1 right, 2 left, 3 bilateral, 9 unspecified |
The stage comes from the exam findings on the date of service. When the stage changes, the code changes at the next visit.
How Do ICD-10 Codes Decide Whether a Test or Procedure Pays?
A test or procedure pays only when its ICD-10 code appears on the payer's covered diagnosis list for that CPT code. Medicare publishes these lists in local coverage determinations and their billing articles, written by each Medicare Administrative Contractor.
These pairings come up on almost every eye care claim.
- OCT. 92133 needs a glaucoma or optic nerve diagnosis, and 92134 needs a retinal diagnosis.
- Injections. 67028 needs a diagnosis covered for the drug, such as wet macular degeneration for aflibercept.
- Visual fields. 92083 needs a diagnosis that affects the visual field, such as glaucoma or a ptosis workup.
- Eyelid surgery. Blepharoplasty and ptosis repair need a functional diagnosis backed by field testing and photos.
The first-listed diagnosis should be the reason for the service. Our ophthalmology medical coding services check every diagnosis against the payer's covered list before the claim is sent.
Which Detailed ICD-10 Guides Cover Each Condition?
Each detailed guide covers one condition, with its complete codes, staging rules and the CPT codes it supports. These are the guides in this series.
- ICD-10 Codes for Macular Degeneration by Type, Stage and Eye. ICD-10 codes for dry and wet macular degeneration (H35.31, H35.32) by stage and laterality, with injection billing pairings.
- ICD-10 Codes for Diabetic Retinopathy by Type, Severity and Eye. How to build diabetic retinopathy ICD-10 codes by diabetes type, severity, macular edema and laterality, with examples.
- Glaucoma ICD-10 Codes With Staging and Laterality. Glaucoma ICD-10 codes with the 7th character stage and laterality, plus examples for POAG and angle closure.
Diagnosis codes work together with the procedure codes in the ophthalmology CPT codes list.
Why Do Eye Care Diagnosis Codes Cause Denials?
Eye care diagnosis denials come mostly from incomplete codes, unspecified eyes, outdated codes and a diagnosis that does not match the procedure. Each one is caught before the claim is sent with a code check.
- A code sent without its final stage or eye character
- An unspecified eye code on a test the payer covers only for a named eye
- A code deleted or expanded in the October update and still loaded in the EHR
- A diagnosis for one eye paired with a procedure on the other eye
- A routine exam code (Z01.0-) sent to Medicare for a medical visit
The October update is the one to plan for. Each year, practices load the new codes, retire deleted ones and update favorites lists before October 1.
How Are Routine and Medical Eye Exams Coded Differently?
A routine eye exam is coded with Z01.00 or Z01.01, while a medical eye exam is coded with the condition or symptom that caused the visit. The diagnosis decides whether the visit goes to medical insurance or a vision plan.
A patient who comes in for new glasses has a routine exam, even if mild dry eye is found. A patient who comes in for blurred vision from cataract has a medical visit. Our vision plan billing team routes each visit to the payer that should pay it.