Alphabetic Index FY2027

H40.50X1

Glaucoma secondary to other eye disorders, unspecified eye, mild stage

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

BillableComplete code, valid to report

H40.50X1 (also written H4050X1) is a billable ICD-10-CM diagnosis code for glaucoma secondary to other eye disorders, unspecified eye, mild stage. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 252 codes in category H40 (Glaucoma). Its 7th character, 1, means mild stage. Its coding notes include a Code also instruction, 3 Excludes1 entries and 11 Excludes2 entries.

7th character

Category H40.5 requires a 7th character. H40.50 has only 5 characters, so a placeholder X fills the 6th position.

Assembled code H40.50X1 Open code

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.

Inherited from H40.5 Glaucoma secondary to other eye disorders
  • underlying eye disorder

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