H40.6 – Glaucoma secondary to drugs

ICD-10-CM 2027 diagnosis code · Glaucoma

Non-billable header

ICD-10-CM code H40.6

Code: H40.6 (claims format: H406)
Description: Glaucoma secondary to drugs
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 7. Diseases of the eye and adnexa (H00-H59)
Block: H40-H42 Glaucoma
Parent codes: H40

Billable codes under H40.6

H40.6 is a header code and cannot be used on claims. Choose the most specific code:

H40.60 – Glaucoma secondary to drugs, unspecified eyeHeader (more codes below)
H40.61 – Glaucoma secondary to drugs, right eyeHeader (more codes below)
H40.62 – Glaucoma secondary to drugs, left eyeHeader (more codes below)
H40.63 – Glaucoma secondary to drugs, bilateralHeader (more codes below)

7th character values

Codes in this category need a 7th character to describe the encounter or episode of care (use placeholder X for empty positions).

Character	Meaning
`0`	stage unspecified
`1`	mild stage
`2`	moderate stage
`3`	severe stage
`4`	indeterminate stage

Notes for H40.6

Use additional code:

code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)

7th character note:

One of the following 7th characters is to be assigned to each code in subcategory H40.6 to designate the stage of glaucoma

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

H40 – Glaucoma

Excludes1 (not coded here):

absolute glaucoma (H44.51-)
congenital glaucoma (Q15.0)
traumatic glaucoma due to birth injury (P15.3)

Index terms for H40.6

Entries in the ICD-10-CM alphabetic index that lead to this code:

Glaucoma, secondary, drugs

Related codes in H40

H40.0 – Glaucoma suspectHeader
H40.1 – Open-angle glaucomaHeader
H40.2 – Primary angle-closure glaucomaHeader
H40.3 – Glaucoma secondary to eye traumaHeader
H40.4 – Glaucoma secondary to eye inflammationHeader
H40.5 – Glaucoma secondary to other eye disordersHeader
H40.8 – Other glaucomaHeader
H40.9 – Unspecified glaucomaBillable

Frequently asked questions

What is ICD-10 code H40.6?

H40.6 is the ICD-10-CM code for glaucoma secondary to drugs, in the block H40-H42 (Glaucoma).

Is H40.6 a billable code?

No. H40.6 is a header code with more specific child codes; report one of the billable codes listed above.

What category does H40.6 belong to?

It belongs to category H40 – Glaucoma.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.