---
title: "ICD-10-CM H10.509: Unspecified blepharoconjunctivitis… | BillingBrief"
description: "ICD-10-CM code H10.509: Unspecified blepharoconjunctivitis, unspecified eye. Category, related codes, and the official source, in plain English."
canonical: "https://billingbrief.com/icd10/h10.509/"
language: "en"
---

# H10.509 Unspecified blepharoconjunctivitis, unspecified eye

ICD-10-CM · [CMS code reference](#source)

**Official ICD-10-CM description:** Unspecified blepharoconjunctivitis, unspecified eye

## Coding notes

From the ICD-10-CM FY2027 (effective October 1, 2026) tabular list. Notes on a parent code or category apply here too.

### Excludes1

Not coded together with this code. The exception is when the two conditions are unrelated to each other.

-   keratoconjunctivitis (H16.2-)

## Related codes

-   [`H10.501` Unspecified blepharoconjunctivitis, right eye ICD-10-CM](https://billingbrief.com/icd10/h10.501/)
-   [`H10.502` Unspecified blepharoconjunctivitis, left eye ICD-10-CM](https://billingbrief.com/icd10/h10.502/)
-   [`H10.503` Unspecified blepharoconjunctivitis, bilateral ICD-10-CM](https://billingbrief.com/icd10/h10.503/)
-   [`H10.511` Ligneous conjunctivitis, right eye ICD-10-CM](https://billingbrief.com/icd10/h10.511/)
-   [`H10.512` Ligneous conjunctivitis, left eye ICD-10-CM](https://billingbrief.com/icd10/h10.512/)
-   [`H10.513` Ligneous conjunctivitis, bilateral ICD-10-CM](https://billingbrief.com/icd10/h10.513/)
-   [`H10.519` Ligneous conjunctivitis, unspecified eye ICD-10-CM](https://billingbrief.com/icd10/h10.519/)
-   [`H10.521` Angular blepharoconjunctivitis, right eye ICD-10-CM](https://billingbrief.com/icd10/h10.521/)

## Common questions

### Is H10.509 a billable code?

Yes. H10.509 is a billable ICD-10-CM code in the ICD-10-CM FY2027 (effective October 1, 2026) code set.

## From the source

Official description from [CMS](https://www.cms.gov/medicare/coding-billing/icd-10-codes).
ICD-10-CM FY2027 (effective October 1, 2026).

Code set

ICD-10-CM

Category

H10 Conjunctivitis

Chapter

Diseases of the eye and adnexa

Billable

Yes

Educational reference only. Not medical, legal, or billing advice. Always check the current official code set and payer policy before you bill. [About BillingBrief and our sources](https://billingbrief.com/about/).