ICD-10 Code H21.271 – Miotic pupillary cyst, right eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.271 – Miotic pupillary cyst, right eye
What it is
H21.271 identifies a miotic pupillary cyst in the right eye. This code is used when a small cystic lesion is documented at or near the pupil and specifically affects the right eye.
Clinical signs
Clinical features vary; refer to documentation. A pupillary cyst may be noted on eye examination as a small, round lesion at the pupillary margin or within the iris/pupil area.
When to use this code
Use H21.271 when the provider documents a miotic pupillary cyst in the right eye and no more specific alternative diagnosis is recorded. It is appropriate for ophthalmology notes, exam findings, or problem lists that clearly identify the right eye.
Do not assume laterality from a general eye cyst diagnosis. If the record does not specify the eye or the lesion type, check documentation before assigning this code.
Do not use for
Do not use this code for left eye, bilateral, or unspecified eye findings. Also avoid it if the documentation describes a different iris, pupillary, or anterior segment lesion.
Coding tip
Confirm laterality and exact lesion wording in the ophthalmology note before coding H21.271.