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ICD-10-CM 2027

ICD-10 code for irregular astigmatism

H52.21

Irregular astigmatism

Header — needs a more specific code

From the official ICD-10-CM alphabetic index entry “Astigmatism (compound) (congenital) › irregular”. Page updated September 29, 2026.

About coding irregular astigmatism

The ICD-10-CM code for irregular astigmatism is H52.21 (Irregular astigmatism).

Within H52.2 (astigmatism), H52.21 is specifically for irregular astigmatism. Related codes cover unspecified astigmatism (H52.20) and regular astigmatism (H52.22).

To report this condition, pick the subcode that matches the documentation: H52.211 (right eye), H52.212 (left eye), H52.213 (bilateral) and H52.219 (unspecified eye).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Common questions about irregular astigmatism ICD-10 codes

What is the ICD-10 code for irregular astigmatism?

H52.21 — Irregular astigmatism (a header code; report a more specific subcode).

Is H52.21 billable?

No. H52.21 is a header code. Report one of its more specific subcodes instead.