ICD-10 Code H21.279 – Miotic pupillary cyst, unspecified eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H21.279 – Miotic pupillary cyst, unspecified eye
What it is
H21.279 identifies a miotic pupillary cyst in an unspecified eye. Use it when documentation notes a pupillary cyst associated with a constricted pupil and does not specify right or left eye.
Clinical signs
Clinical features vary; refer to documentation. Typical notes may describe a small cyst at or near the pupil margin, sometimes seen on eye examination and associated with a miotic pupil.
When to use this code
Use this code when the provider documents a miotic pupillary cyst and laterality is not stated. It also fits follow-up visits when the condition remains on the assessment and no more specific eye code is available.
If the record identifies the right or left eye, use the laterality-specific code instead. Check documentation when the cyst is described differently or when another iris or pupillary disorder is the primary diagnosis.
Do not use for
Do not use H21.279 for a general pupillary abnormality without a cyst. Also avoid it when the eye is specified, because an unspecified-eye code may be incorrect.
Coding tip
Confirm laterality and the exact wording in the ophthalmology note before assigning H21.279.