DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

H42 diagnosis code · Billable category · FY2027

H42 Glaucoma in diseases classified elsewhere

  • Billable
  • Not CC/MCC
  • POA reported

H42 ICD-10 code: a billable diagnosis code in FY2027; the category has no subdivisions.

Where it sits

  1. Chapter 7 Diseases of the eye and adnexa (H00-H59)
  2. H40-H42 Glaucoma (H40-H42)
  3. H42 Glaucoma in diseases classified elsewhere
CC / MCC
Neither
MS-DRG
124-125
HCC V28
–
POA
Reported
Code Editor
Manifestation
Index entries
6

Instructions

At H42

Excludes1

  • glaucoma (in) onchocerciasis (B73.02) B73.02
  • glaucoma (in) syphilis (A52.71) A52.71
  • glaucoma (in) tuberculous (A18.59) A18.59
  • neovascular secondary angle closure glaucoma (H40.84-) H40.84

Code first

  • underlying condition, such as:
  • amyloidosis (E85.-) E85
  • aniridia (Q13.1) Q13.1
  • glaucoma (in) diabetes mellitus (E08.39, E09.39, E10.39, E11.39, E13.39) E08.39 E09.39 E10.39 E11.39 E13.39
  • Lowe's syndrome (E72.03) E72.03
  • Rieger anomaly (Q13.81) Q13.81
  • specified metabolic disorder (E70-E88) E70 E88

Notes that also apply

Chapter 7 instructions (Notes 1, Excludes2 11): printed on the chapter 7 page.

Index entries

  • Glaucomain (due to)endocrine disease NOS → E34.9 [H42]
  • Glaucomain (due to)Lowe's syndrome → E72.03 [H42]
  • Glaucomain (due to)amyloidosis → E85.4 [H42]
  • Glaucomain (due to)metabolic disease NOS → E88.9 [H42]
  • Glaucomain (due to)aniridia → Q13.1 [H42]
  • Glaucomain (due to)Rieger anomaly → Q13.81 [H42]

NCHS Alphabetic Index. Index first, then the Tabular List.

Medicare grouping and edits

CMS files for H42
CC / MCCNeither
Appendix BMDC 02 Diseases and Disorders of the Eye, MS-DRG 124-125 (Other Disorders of the Eye with MCC or Thrombolytic Agent…)
Code EditorManifestation code: not allowed as principal diagnosis
POAReported
HCC V28–

CMS: MS-DRG v44 (Appendix B, C), MCE v44, POA list FY2027, 2027 Initial ICD-10-CM Mappings. What the rows mean.

Hierarchy