2027 ICD-10-CM Diagnosis Code H10.33Unspecified acute conjunctivitis, bilateral

ICD-10-CM Codes›H00–H59›H10-H11›H10

ICD-10-CM H10.33
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

H10.33 is a billable ICD-10-CM diagnosis code for unspecified acute conjunctivitis, bilateral. 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. Coders also document this condition as acute follicular conjunctivitis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Cornea and external disease.

Code Identity

ICD-10-CM Code
H10.33
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified acute conjunctivitis, bilateral
Short Description
Unspecified acute conjunctivitis, bilateral
Same as the full description in the CMS dataset.
Parent Code
H10.3
Unspecified acute conjunctivitis

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH10-H11Disorders of conjunctiva
CategoryH10Conjunctivitis
This CodeH10.33Unspecified acute conjunctivitis, bilateral

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute follicular conjunctivitis
  • Acute follicular conjunctivitis of bilateral eyes
  • Acute follicular conjunctivitis of left eye
  • Acute follicular conjunctivitis of right eye
  • Bilateral acute conjunctivitis

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to H10.33: its own notes plus those printed at H10.3, 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 H10.3 Unspecified acute conjunctivitis applies to 4 codes
  • ophthalmia neonatorum NOS (P39.1)
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.

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

  • Conjunctivitis

    inflammation of the conjunctiva.

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 H10.33 to ICD-9-CMHistory

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

ICD-9-CM
372.00 Acute conjunctivitis NOS
Approximate The match is approximate rather than exact.

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 H10.33Overview

What is the ICD-10 code for unspecified acute conjunctivitis, bilateral?

The ICD-10-CM code for unspecified acute conjunctivitis, bilateral is H10.33 (sometimes written as H1033). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is H10.33 (Unspecified acute conjunctivitis) a billable code?

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

What MS-DRG does H10.33 group to?

When unspecified acute conjunctivitis, bilateral 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 H10.33 be reported with P39.1?

Not as a rule. The Excludes1 note at H10.3, which applies to H10.33, lists "ophthalmia neonatorum NOS (P39.1)". 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 H10.33?

Under the General Equivalence Mappings, unspecified acute conjunctivitis, bilateral converts to ICD-9-CM 372.00 (acute conjunctivitis NOS). The mapping is approximate, so confirm the match fits the documentation.