H18.40 – Unspecified corneal degeneration
ICD-10-CM 2027 diagnosis code · Disorders of sclera, cornea, iris and ciliary body
ICD-10-CM code
H18.40
- Code
H18.40(claims format:H1840)- Description
- Unspecified corneal degeneration
- Billable
- Yes – valid for HIPAA-covered transactions
- 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 › H18.4
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
H18.4 – Corneal degeneration
Index terms for H18.40
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in H18.4
Frequently asked questions
What is ICD-10 code H18.40?
H18.40 is the ICD-10-CM code for unspecified corneal degeneration, in the block H15-H22 (Disorders of sclera, cornea, iris and ciliary body).
Is H18.40 a billable code?
Yes. H18.40 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does H18.40 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.