Billable / Specific Code
ICD-10-CM H18.509 is the diagnosis code for Unspecified hereditary corneal dystrophies, unspecified eye. 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 billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
Always refer to the official ICD-10-CM Tabular List for complete coding guidelines. Ensure documentation supports the specificity of the code selected. When in doubt, consult a certified medical coder or the latest CMS guidelines.
Understanding where H18.509 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, H18.509 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
H18.509 is the ICD-10-CM diagnosis code for "Unspecified hereditary corneal dystrophies, unspecified eye". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of H18.509 is H18.50 ("Unspecified hereditary corneal dystrophies"). H18.509 provides a more specific classification within this category.
H18.509 is located in Section H15-H22 — "Disorders of sclera, cornea, iris and ciliary body" within Chapter 7 of the ICD-10-CM Tabular List.
Use H18.509 when the patients documented diagnosis matches "Unspecified hereditary corneal dystrophies, unspecified eye" 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 Unspecified hereditary corneal dystrophies, unspecified eye is H18.509.
Yes, H18.509 can be used as a primary diagnosis code since it is billable and specific.
H18.509 is in Chapter 7 of the ICD-10-CM Tabular List.
Yes, H18.509 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.