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ICD-10-CM 2027

ICD-10 code for pupillary abnormal

H21.56

Pupillary abnormalities

Header — needs a more specific code

From the official ICD-10-CM alphabetic index entry “Abnormal, abnormality, abnormalities › pupillary”. Page updated September 29, 2026.

About coding pupillary abnormal

The ICD-10-CM code for pupillary abnormal is H21.56 (Pupillary abnormalities).

Within H21.5 (other and unspecified adhesions and disruptions of iris and ciliary body), H21.56 is specifically for pupillary abnormalities. Related codes cover unspecified adhesions of iris (H21.50), anterior synechiae (iris) (H21.51), goniosynechiae (H21.52), Iridodialysis (H21.53), posterior synechiae (iris) (H21.54) and recession of chamber angle (H21.55).

To report this condition, pick the subcode that matches the documentation: H21.561 (eye), H21.562 (eye), H21.563 (bilateral) and H21.569 (eye).

Don't report H21.56 together with the conditions in its Excludes1 note: congenital deformity of pupil (Q13.2-).

More specific pupillary abnormal codes (official index)

  • function (reaction) (reflex)

Don't confuse with (Excludes1 for H21.56)

  • congenital deformity of pupil (Q13.2-)

Common questions about pupillary abnormal ICD-10 codes

What is the ICD-10 code for pupillary abnormal?

H21.56 — Pupillary abnormalities (a header code; report a more specific subcode).

Is H21.56 billable?

No. H21.56 is a header code. Report one of its more specific subcodes instead.