Alphabetic Index FY2027

H40.4

Glaucoma secondary to eye inflammation

FY2027Chapter 7: Diseases of the eye and adnexa/H40–H42 Glaucoma

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

H40.4 is a non-billable ICD-10-CM code header for glaucoma secondary to eye inflammation. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are H40.40 Glaucoma secondary to eye inflammation, unspecified eye; H40.41 Glaucoma secondary to eye inflammation, right eye; H40.42 Glaucoma secondary to eye inflammation, left eye and H40.43 Glaucoma secondary to eye inflammation, bilateral. Its coding notes include a Code also instruction, 3 Excludes1 entries and 11 Excludes2 entries.

7th characters

Every code below needs one of these.

One of the following 7th characters is to be assigned to each code in subcategory H40.4 to designate the stage of glaucoma

  • 0stage unspecified
  • 1mild stage
  • 2moderate stage
  • 3severe stage
  • 4indeterminate stage

Guidelines tip

From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.

Glaucoma needs the type, the affected eye and the stage. The 7th character 4 (indeterminate) is not the same as 0 (stage not documented).

Guidelines I.C.7.aGlaucoma: type, eye and stageRead the official text

Code also

Two codes may be needed to describe the condition. This note gives no sequencing order.

This code
  • underlying condition

Excludes1

Not coded here. The listed conditions generally should not be reported together.

Inherited from H40 Glaucoma
  • absolute glaucoma (H44.51-)
  • congenital glaucoma (Q15.0)
  • traumatic glaucoma due to birth injury (P15.3)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Also from chapter/block level (11 notes)
Inherited from Chapter 7 Diseases of the eye and adnexa
  • 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

Also from chapter/block level (1 note)
Inherited from Chapter 7 Diseases of the eye and adnexa
  • Use an external cause code following the code for the eye condition, if applicable, to identify the cause of the eye condition

Alphabetic Index terms

Terms the official Alphabetic Index lists for this code. 1 entry

More specific codes under H40.4 4