Billable / Specific Code
ICD-10-CM H21.309 is the diagnosis code for Idiopathic cysts of iris, ciliary body or anterior chamber, 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 H21.309 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, H21.309 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
H21.309 is the ICD-10-CM diagnosis code for "Idiopathic cysts of iris, ciliary body or anterior chamber, unspecified eye". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of H21.309 is H21.30 ("Idiopathic cysts of iris, ciliary body or anterior chamber"). H21.309 provides a more specific classification within this category.
H21.309 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 H21.309 when the patients documented diagnosis matches "Idiopathic cysts of iris, ciliary body or anterior chamber, 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 Idiopathic cysts of iris, ciliary body or anterior chamber, unspecified eye is H21.309.
Yes, H21.309 can be used as a primary diagnosis code since it is billable and specific.
H21.309 is in Chapter 7 of the ICD-10-CM Tabular List.
Yes, H21.309 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.