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ICD-10-CM 2027 diagnosis code

H10.40Unspecified chronic conjunctivitis

Not billable — use a more specific code

H10.40 is a header code, so it can't be reported by itself. Choose one of the 4 more specific codes beneath it.

Looking up by condition? See ICD-10 code for Chronic conjunctivitis nos.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About H10.40

H10.40 is the ICD-10-CM diagnosis code for unspecified chronic conjunctivitis. It belongs to category H10 (conjunctivitis), block H10-H11 (disorders of conjunctiva) and chapter 7 (diseases of the eye and adnexa). It is a header code, so it can't be reported by itself; one of its 4 subcodes must be used instead.

Within H10.4, choose H10.40 (Unspecified chronic conjunctivitis) only when documentation doesn't support a more specific option: chronic giant papillary conjunctivitis (H10.41), simple chronic conjunctivitis (H10.42), chronic follicular conjunctivitis (H10.43), vernal conjunctivitis (H10.44) and other chronic allergic conjunctivitis (H10.45).

To report this condition, pick the subcode that matches the documentation: H10.401 (right eye), H10.402 (left eye), H10.403 (bilateral) and H10.409 (unspecified eye).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under H10.40

Notes that apply from higher levels

Instructions written at a parent level also apply to H10.40.

› From H10 Conjunctivitis
Excludes1

Broader instructions also apply from Chapter 7: Diseases of the eye and adnexa.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to H10.40.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about H10.40

Is H10.40 billable?

No. H10.40 is a header code. Report one of its more specific subcodes instead.