2027 ICD-10-CM Diagnosis Code H59.42Inflammation (infection) of postprocedural bleb, stage 2

ICD-10-CM Codes›H00–H59›H59›H59

ICD-10-CM H59.42
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

H59.42 is a billable ICD-10-CM diagnosis code for inflammation (infection) of postprocedural bleb, stage 2. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Postprocedural or postoperative eye complication.

Code Identity

ICD-10-CM Code
H59.42
Billable Status
Yes — Valid for Submission
Code Describes
Inflammation (infection) of postprocedural bleb, stage 2
Short Description
Inflammation (infection) of postprocedural bleb, stage 2
Same as the full description in the CMS dataset.
Parent Code
H59.4
Inflammation (infection) of postprocedural bleb

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 CodeH59.42Inflammation (infection) of postprocedural bleb, stage 2

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to H59.42: its own notes plus those printed at H59.4, 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 H59.4 Inflammation (infection) of postprocedural bleb applies to 4 codes
  • filtering (vitreous) bleb after glaucoma surgery status (Z98.83)
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 H59.42, its category, or a range that includes it.

Applicable To 1

These notes mention H59.42.

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

Excludes1 3

These codes carry an Excludes1 note naming H59.42: they are not reported together with it, unless the two conditions are unrelated.

  • H44.0 Purulent endophthalmitis
    bleb associated endophthalmitis (H59.4-) names H59.4-, which includes this code
  • H44.1 Other endophthalmitis
    bleb associated endophthalmitis (H59.4-) names H59.4-, which includes this code
  • Z98.83 Filtering (vitreous) bleb after glaucoma surgery status
    Inflammation (infection) of postprocedural bleb (H59.4-) names H59.4-, which includes this code

Excludes2 3

These codes carry an Excludes2 note naming H59.42: 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
  • T81.4 Infection following a procedure
    bleb associated endophthalmitis (H59.4-) names H59.4-, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to 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

Convert H59.42 to ICD-9-CMHistory

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

ICD-9-CM
379.62 Inflam postproc bleb, 2
Exact Match The mapping is direct, with no qualifiers.

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 H59.42Overview

What is the ICD-10 code for inflammation (infection) of postprocedural bleb, stage 2?

The ICD-10-CM code for inflammation (infection) of postprocedural bleb, stage 2 is H59.42 (sometimes written as H5942). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is H59.42 (Inflammation (infection) of postprocedural bleb) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report inflammation (infection) of postprocedural bleb, stage 2 on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does H59.42 group to?

When inflammation (infection) of postprocedural bleb, stage 2 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 H59.42 be reported with Z98.83?

Not as a rule. The Excludes1 note at H59.4, which applies to H59.42, lists "filtering (vitreous) bleb after glaucoma surgery status (Z98.83)". 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 H59.42?

Under the General Equivalence Mappings, inflammation (infection) of postprocedural bleb, stage 2 converts to ICD-9-CM 379.62 (inflam postproc bleb, 2). The mapping is a direct match.