2026 ICD-10-CM Diagnosis Code H44.121Parasitic endophthalmitis, unspecified, right eye

ICD-10-CM Codes›H00–H59›H43-H44›H44

ICD-10-CM H44.121
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H44.121 is a billable ICD-10-CM diagnosis code for parasitic endophthalmitis, unspecified, right eye. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 121 through 122. Coders also document this condition as endophthalmitis of right eye. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Uveitis and ocular inflammation.

Code Identity

ICD-10-CM Code
H44.121
Billable Status
Yes — Valid for Submission
Code Describes
Parasitic endophthalmitis, unspecified, right eye
Short Description
Parasitic endophthalmitis, unspecified, right eye
Same as the full description in the CMS dataset.
Parent Code
H44.12
Parasitic endophthalmitis, unspecified

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH43-H44Disorders of vitreous body and globe
CategoryH44Disorders of globe
This CodeH44.121Parasitic endophthalmitis, unspecified, right eye

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Endophthalmitis of right eye
  • Parasitic endophthalmitis
  • Right parasitic endophthalmitis

Clinical ClassificationClinical

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

CCSR EYE004
Uveitis and ocular inflammation
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Parasitic Endophthalmitis

    infection of the interior of the eye, especially the aqueous and/or vitreous humor, by a parasite.

Patient EducationClinical

Eye Infections

Your eyes can get infections from bacteria, fungi, or viruses. Eye infections can occur in different parts of the eye and can affect just one eye or both. Two common eye infections are:

Read the full article at MedlinePlus

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

Convert H44.121 to ICD-9-CMHistory

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

ICD-9-CM
360.13 Parasitic endophthal 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 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About H44.121Overview

Is H44.121 (Parasitic endophthalmitis, unspecified) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report parasitic endophthalmitis, unspecified, right eye on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does H44.121 group to?

When parasitic endophthalmitis, unspecified, right eye is the principal diagnosis on an inpatient stay, it groups to MS-DRG 121, 122, with relative weights from 0.7858 to 1.1633 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of H44.121?

Under the General Equivalence Mappings, parasitic endophthalmitis, unspecified, right eye converts to ICD-9-CM 360.13 (parasitic endophthal NOS). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.