Billable / Specific Code
ICD-10-CM H21.331 is the diagnosis code for Parasitic cyst of iris, ciliary body or anterior chamber, right 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 H21.331 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, H21.331 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
H21.331 is the ICD-10-CM diagnosis code for "Parasitic cyst of iris, ciliary body or anterior chamber, right eye". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of H21.331 is H21.33 ("Parasitic cyst of iris, ciliary body or anterior chamber"). H21.331 provides a more specific classification within this category.
H21.331 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 H21.331 when the patients documented diagnosis matches "Parasitic cyst of iris, ciliary body or anterior chamber, right 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 Parasitic cyst of iris, ciliary body or anterior chamber, right eye is H21.331.
Yes, H21.331 can be used as a primary diagnosis code since it is billable and specific.
H21.331 is in Chapter 7 of the ICD-10-CM Tabular List.
Yes, H21.331 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.