ICD-10-CM H18.4 is the diagnosis code for Corneal degeneration. This code falls under the section "Disorders of sclera, cornea, iris and ciliary body" within Chapter 7 — Diseases of the eye and adnexa (H00-H59). It is a non-billable/non-specific ICD-10-CM code that should not be used for reimbursement. A more specific sub-code is required for billing. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
The following conditions should never be coded at the same time as H18.4. They are mutually exclusive:
Understanding where H18.4 sits in the ICD-10-CM classification helps ensure proper coding:
No, H18.4 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
H18.4 is the ICD-10-CM diagnosis code for "Corneal degeneration". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of H18.4 is H18 ("Other disorders of cornea"). H18.4 provides a more specific classification within this category.
H18.4 is located in Section H15-H22 — "Disorders of sclera, cornea, iris and ciliary body" within Chapter 7 of the ICD-10-CM Tabular List.
H18.4 has 1918 sub-code(s) that provide more specific detail: A00, A01, A02, A03, A04 and more.
Use H18.4 when the patients documented diagnosis matches "Corneal degeneration" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Corneal degeneration is H18.4.
No, H18.4 is non-billable. Use a more specific sub-code for primary diagnosis billing.
H18.4 is in Chapter 7 of the ICD-10-CM Tabular List.
Type 1 Excludes for H18.4 include: Mooren's ulcer (H16.0-); recurrent erosion of cornea (H18.83-).
Yes, H18.4 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.