2026 ICD-10-CM Diagnosis Code H59.099Other disorders of unspecified eye following cataract surgery

ICD-10-CM Codes›H00–H59›H59›H59

ICD-10-CM H59.099
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H59.099 is a billable ICD-10-CM diagnosis code for other disorders of unspecified eye following cataract surgery. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 919 through 921. The code is flagged as an unspecified code, since codes identifying laterality exist in the same family. Coders also document this condition as Brown-McLean Syndrome. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Postprocedural or postoperative eye complication.

Code Identity

ICD-10-CM Code
H59.099
Billable Status
Yes — Valid for Submission
Code Describes
Other disorders of unspecified eye following cataract surgery
Short Description
Other disorders of unsp eye following cataract surgery
Parent Code
H59.09
Other disorders of the eye following cataract surgery

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH59Intraoperative and postprocedural complications and disorders of eye and adnexa, not elsewhere classified
CategoryH59Intraoperative and postprocedural complications and disorders of eye and adnexa, not elsewhere classified
This CodeH59.099Other disorders of unspecified eye following cataract surgery

Code EditsBilling

Medicare Code Editor checks that affect claim validity for H59.099.

Unspecified codes
Unspecified codes exist in the ICD-10-CM classification for circumstances when documentation in the medical record does not provide the level of detail needed to support reporting a more specific code. However, in the inpatient setting, there should generally be very limited and rare circumstances for which the laterality (right, left, bilateral) of a condition is unable to be documented and reported. The following pages contain the list of unspecified ICD-10-CM diagnosis codes for which there is a more specific code to identify laterality (right, left, bilateral) within that code family.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Brown-McLean Syndrome
  • Glaucoma of childhood
  • Secondary childhood glaucoma following congenital cataract surgery
  • Strabismus following cataract surgery
  • Strabismus following ocular surgery
  • Visual loss after cataract extraction
  • Vitreous syndrome following cataract surgery

Clinical ClassificationClinical

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

CCSR EYE011
Postprocedural or postoperative eye complication
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 H59.099 to ICD-9-CMHistory

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

ICD-9-CM
997.99 Surg compl-body syst NEC
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 H59.099Overview

Is H59.099 (Other disorders of the eye following cataract surgery) a billable code?

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

What MS-DRG does H59.099 group to?

When other disorders of unspecified eye following cataract surgery is the principal diagnosis on an inpatient stay, it groups to MS-DRG 919, 920, 921, with relative weights from 0.6884 to 1.8308 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of H59.099?

Under the General Equivalence Mappings, other disorders of unspecified eye following cataract surgery converts to ICD-9-CM 997.99 (surg compl-body syst NEC). 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.