NPI Atlas

H18.23 – Secondary corneal edema

ICD-10-CM 2027 diagnosis code · Disorders of sclera, cornea, iris and ciliary body

Non-billable header

ICD-10-CM code H18.23

Code: H18.23 (claims format: H1823)
Description: Secondary corneal edema
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: H15-H22 Disorders of sclera, cornea, iris and ciliary body
Parent codes: H18 › H18.2

Billable codes under H18.23

H18.23 is a header code and cannot be used on claims. Choose the most specific code:

H18.231 – Secondary corneal edema, right eyeBillable
H18.232 – Secondary corneal edema, left eyeBillable
H18.233 – Secondary corneal edema, bilateralBillable
H18.239 – Secondary corneal edema, unspecified eyeBillable

Index terms for H18.23

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

Edema, edematous, cornea, secondary

Related codes in H18.2

H18.20 – Unspecified corneal edemaBillable
H18.21 – Corneal edema secondary to contact lensHeader
H18.22 – Idiopathic corneal edemaHeader

Frequently asked questions

What is ICD-10 code H18.23?

H18.23 is the ICD-10-CM code for secondary corneal edema, in the block H15-H22 (Disorders of sclera, cornea, iris and ciliary body).

Is H18.23 a billable code?

No. H18.23 is a header code with more specific child codes; report one of the billable codes listed above.

What category does H18.23 belong to?

It belongs to category H18 – Other disorders of cornea.

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.