2026 ICD-10-CM Diagnosis Code H26.491Other secondary cataract, right eye

ICD-10-CM Codes›H00–H59›H25-H28›H26

ICD-10-CM H26.491
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H26.491 is a billable ICD-10-CM diagnosis code for other secondary cataract, right eye. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 124 through 125. Coders also document this condition as after-cataract not obscuring vision following extraction of cataract. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Cataract and other lens disorders.

Code Identity

ICD-10-CM Code
H26.491
Billable Status
Yes — Valid for Submission
Code Describes
Other secondary cataract, right eye
Short Description
Other secondary cataract, right eye
Same as the full description in the CMS dataset.
Parent Code
H26.49
Other secondary cataract

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH25-H28Disorders of lens
CategoryH26Other cataract
This CodeH26.491Other secondary cataract, right eye

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • After-cataract not obscuring vision following extraction of cataract
  • After-cataract of right eye
  • Right after-cataract not obscuring vision

Clinical ClassificationClinical

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

CCSR EYE002
Cataract and other lens disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Cataract

A cataract is a clouding of the lens in your eye. It affects your vision. Cataracts are very common in older people. By age 80, more than half of all Americans either have a cataract or have had cataract surgery.

Read the full article at MedlinePlus

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

Convert H26.491 to ICD-9-CMHistory

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

ICD-9-CM
366.52 After-cataract NEC
Approximate The match is approximate rather than exact.
ICD-9-CM
366.53 Aftr-catar obscur vision
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 H26.491Overview

Is H26.491 (Other secondary cataract) a billable code?

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

What MS-DRG does H26.491 group to?

When other secondary cataract, right eye is the principal diagnosis on an inpatient stay, it groups to MS-DRG 124, 125, with relative weights from 0.7678 to 1.3231 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of H26.491?

Under the General Equivalence Mappings, other secondary cataract, right eye converts to ICD-9-CM 366.52 (after-cataract NEC) and 366.53 (aftr-catar obscur vision). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.