---
title: "ICD-10-CM H10.402: Unspecified chronic conjunctivitis… | BillingBrief"
description: "ICD-10-CM code H10.402: Unspecified chronic conjunctivitis, left eye. Category, related codes, and the official source, in plain English."
canonical: "https://billingbrief.com/icd10/h10.402/"
language: "en"
---

# H10.402 Unspecified chronic conjunctivitis, left eye

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

**Official ICD-10-CM description:** Unspecified chronic conjunctivitis, left 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

-   [`H10.401` Unspecified chronic conjunctivitis, right eye ICD-10-CM](https://billingbrief.com/icd10/h10.401/)
-   [`H10.403` Unspecified chronic conjunctivitis, bilateral ICD-10-CM](https://billingbrief.com/icd10/h10.403/)
-   [`H10.409` Unspecified chronic conjunctivitis, unspecified eye ICD-10-CM](https://billingbrief.com/icd10/h10.409/)
-   [`H10.411` Chronic giant papillary conjunctivitis, right eye ICD-10-CM](https://billingbrief.com/icd10/h10.411/)
-   [`H10.412` Chronic giant papillary conjunctivitis, left eye ICD-10-CM](https://billingbrief.com/icd10/h10.412/)
-   [`H10.413` Chronic giant papillary conjunctivitis, bilateral ICD-10-CM](https://billingbrief.com/icd10/h10.413/)
-   [`H10.419` Chronic giant papillary conjunctivitis, unspecified eye ICD-10-CM](https://billingbrief.com/icd10/h10.419/)
-   [`H10.421` Simple chronic conjunctivitis, right eye ICD-10-CM](https://billingbrief.com/icd10/h10.421/)

## Common questions

### Is H10.402 a billable code?

Yes. H10.402 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/).