H21.503
✓ BillableUnspecified adhesions of iris, bilateral
Diseases of the eye and adnexa (H00-H59)
Clinical Description
ICD-10-CM code H21.503 represents unspecified adhesions of iris, bilateral. This code falls under the Diseases of the eye and adnexa (H00-H59) classification. It is a billable/specific code valid for HIPAA-covered transactions as of October 1, 2025 (FY2026). This code can be used to indicate a diagnosis for reimbursement purposes on insurance claims.
This is a 7-character code at the 6th level of specificity. This is the most specific code available in this subcategory. Coders should note that H21.503 has 1 Excludes1 restriction(s) — codes that cannot be reported together on the same claim.
Frequently Asked Questions
What is ICD-10 code H21.503?
ICD-10-CM code H21.503 is "Unspecified adhesions of iris, bilateral". It belongs to the category: Diseases of the eye and adnexa (H00-H59).
Is H21.503 a billable ICD-10 code?
Yes, H21.503 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
What codes are excluded with H21.503?
H21.503 has 1 Excludes1 rule(s). These codes are mutually exclusive and cannot be coded together on the same claim.
Can H21.503 be coded with other codes?
H21.503 has 1 Excludes2 note(s). These conditions can be coded together if both are documented in the patient record.
Related Codes in H21.50
Other codes in the same category that may be relevant for differential coding:
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Data Source
CMS ICD-10-CM 2026 Tabular List
Updated October 1, 2025 (FY2026)