2027 ICD-10-CM Diagnosis Code H10.9Unspecified conjunctivitis

ICD-10-CM Codes›H00–H59›H10-H11›H10

ICD-10-CM H10.9
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

H10.9 is a billable ICD-10-CM diagnosis code for unspecified conjunctivitis. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 124 through 125. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Cornea and external disease.

Code Identity

ICD-10-CM Code
H10.9
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified conjunctivitis
Short Description
Unspecified conjunctivitis
Same as the full description in the CMS dataset.
Parent Code
H10
Conjunctivitis

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH10-H11Disorders of conjunctiva
CategoryH10Conjunctivitis
This CodeH10.9Unspecified conjunctivitis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Bacterial conjunctivitis
  • Bilateral conjunctivitis
  • Bilateral infectious conjunctivitis
  • Bilateral parasitic conjunctivitis
  • Conjunctivitis
  • Conjunctivitis associated with autoimmune skin disorder
  • Conjunctivitis associated with epidermolysis bullosa
  • Conjunctivitis caused by Bordetella pertussis
  • Conjunctivitis due to lichen planus
  • Conjunctivitis due to reactive arthritis triad
  • Conjunctivitis of bilateral eyes caused by bacteria
  • Conjunctivitis of left eye
  • Conjunctivitis of left eye caused by bacteria
  • Conjunctivitis of right eye
  • Conjunctivitis of right eye caused by bacteria
  • Follicular conjunctivitis
  • Infection caused by Bordetella
  • Infection of conjunctiva of left eye
  • Infection of conjunctiva of right eye
  • Parasitic conjunctivitis
  • Parasitic conjunctivitis of left eye
  • Parasitic conjunctivitis of right eye
  • Protozoal conjunctivitis
  • Rhinoconjunctivitis

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to H10.9: its own notes plus those printed at H10 and Chapter 7. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From H10 Conjunctivitis applies to 72 codes

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 7 (H00-H59) Diseases of the eye and adnexa applies to 2,677 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • diabetes mellitus related eye conditions (E09.3-, E10.3-, E11.3-, E13.3-)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury (trauma) of eye and orbit (S05.-)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • syphilis related eye disorders (A50.01, A50.3-, A51.43, A52.71)

Notes

General instructions on how these codes are used.

From Chapter 7 (H00-H59) Diseases of the eye and adnexa applies to 2,677 codes
  • Use an external cause code following the code for the eye condition, if applicable, to identify the cause of the eye condition

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR EYE001
Cornea and external disease
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Endophthalmitis

    suppurative inflammation of the tissues of the internal structures of the eye frequently associated with an infection.

Patient EducationClinical

Pink Eye

Conjunctivitis is the medical name for pink eye. It involves inflammation of the outer layer of the eye and inside of the eyelid. It can cause swelling, itching, burning, discharge, and redness. Causes include:

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert H10.9 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
372.30 Conjunctivitis NOS
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About H10.9Overview

What is the ICD-10 code for unspecified conjunctivitis?

The ICD-10-CM code for unspecified conjunctivitis is H10.9 (sometimes written as H109). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is H10.9 (Conjunctivitis) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report unspecified conjunctivitis on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does H10.9 group to?

When unspecified conjunctivitis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 125, 124, with relative weights from 0.7699 to 1.2470 depending on complications. Higher weights mean higher Medicare reimbursement.

Can H10.9 be reported with a code from H16.2?

Not as a rule. The Excludes1 note at H10, which applies to H10.9, lists "keratoconjunctivitis (H16.2-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).

What is the ICD-9 equivalent of H10.9?

Under the General Equivalence Mappings, unspecified conjunctivitis converts to ICD-9-CM 372.30 (conjunctivitis NOS). The mapping is a direct match.