ICD-10 Code H52.20 – Unspecified astigmatism (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H52.20 – Unspecified astigmatism
What it is
Unspecified astigmatism is a refractive error where the eye does not focus light evenly, causing blurred or distorted vision. Use this code when astigmatism is documented but the type or further detail is not specified.
Clinical signs
Patients may report blurred vision, eye strain, or difficulty seeing clearly at certain distances. Clinical features vary; refer to documentation and the eye examination findings.
When to use this code
Use H52.20 when the provider documents astigmatism without naming a subtype such as regular or irregular. It is also appropriate when the record confirms astigmatism but does not include enough detail for a more specific code. Check documentation if laterality or type is clarified elsewhere.
Do not use for
Do not use this code when a more specific astigmatism diagnosis is documented. Do not assign it if the record only notes blurred vision without confirming astigmatism.
Coding tip
If the note says “astigmatism” but gives no detail, H52.20 is the default code unless the chart supports a more specific option.