2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 919 through 921. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 34 closely related codes. 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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to H59.099: its own notes plus those printed at H59 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 H59 Intraoperative and postprocedural complications and disorders of eye and adnexa, not elsewhere classified applies to 66 codes
  • mechanical complication of intraocular lens (T85.2)
  • mechanical complication of other ocular prosthetic devices, implants and grafts (T85.3)
  • pseudophakia (Z96.1)
  • secondary cataracts (H26.4-)

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.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name H59.099, its category, or a range that includes it.

Applicable To 1

These notes mention H59.099.

  • Z83.51 Family history of eye disorders
    Conditions classifiable to H00-H53, H55-H59 names H55-H59, which includes this code

Excludes1 1

These codes carry an Excludes1 note naming H59.099: they are not reported together with it, unless the two conditions are unrelated.

  • H43.0 Vitreous prolapse
    vitreous syndrome following cataract surgery (H59.0-) names H59.0-, which includes this code

Excludes2 2

These codes carry an Excludes2 note naming H59.099: its condition is not part of those codes, and both may be reported when the patient has both.

  • Block T80-T88 Complications of surgical and medical care, not elsewhere classified
    intraoperative and postprocedural complications of specified body systems (D78.-, E36.-, E89.-, G97.3-, G97.4, H59.3-, H59.-, H95.2-, H95.3, I97.4-, I97.5, J95.6-, J95.7, K91.6-, L76.-, M96.-, N99.-) names H59.-, which includes this code
  • T81 Complications of procedures, not elsewhere classified
    intraoperative and postprocedural complications of specific body system (D78.-, E36.-, E89.-, G97.3-, G97.4, H59.3-, H59.-, H95.2-, H95.3, I97.4-, I97.5, J95, K91.-, L76.-, M96.-, N99.-) names H59.-, which includes this code

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 clear lens inside your eye. This cloudiness blocks light from reaching the back of the eye, making it harder to see clearly. A cataract can affect one or both eyes, but it doesn't spread from one eye to the other.

The full article covers:

  • What are cataracts?
  • What causes cataracts?
  • Who is more likely to develop cataracts?
  • What are the symptoms of cataracts?
  • How are cataracts diagnosed?
  • How are cataracts treated?
  • Can cataracts be prevented?

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About H59.099Overview

What is the ICD-10 code for other disorders of unspecified eye following cataract surgery?

The ICD-10-CM code for other disorders of unspecified eye following cataract surgery is H59.099 (sometimes written as H59099). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

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 920, 919, 921, with relative weights from 0.6719 to 1.7624 depending on complications. Higher weights mean higher Medicare reimbursement.

Is H59.099 a CC or MCC?

CMS lists H59.099 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 34 closely related codes in its exclusion list.

Can H59.099 be reported with T85.2?

Not as a rule. The Excludes1 note at H59, which applies to H59.099, lists "mechanical complication of intraocular lens (T85.2)". 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).