Is H21.50 a billable ICD-10-CM code?

No. H21.50 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does H21.50 sit in the tabular list?

Diseases of the eye and adnexa (H00-H59), in the block Disorders of sclera, cornea, iris and ciliary body (H15-H22).

What cannot be coded together with H21.50?

H21.50 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above H21.50 (H21.5) and apply to it just the same.

H21.50

H21.50 — Unspecified adhesions of iris

Non-billable headerICD-10-CM

H21.50 is a non-billable header ICD-10-CM code for unspecified adhesions of iris. It cannot be billed on its own: choose one of the more specific child codes below.

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

Synechia (iris) NOS

Excludes1 inherited from the categories above H21.50

These are not written on H21.50, but they bind it: a note on a category applies to every code beneath it. Billing H21.50 with anything listed here is a denial.

Written on H21.5 — Other and unspecified adhesions and disruptions of iris and ciliary body

corectopia (Q13.2)

Excludes2 inherited from the categories above H21.50

Also inherited, and the opposite of Excludes1: these conditions are not part of H21.50, but a patient can have both, so you may code both.

Written on H21 — Other disorders of iris and ciliary body

sympathetic uveitis (H44.1-)

Risk adjustment

H21.50 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Code history

H21.50 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Code to one of these instead H21.50

4 child codes. Green means billable.

Related codes at this level

Codes that share H21.5. If H21.50 is not quite right, the correct code is usually one of these.

Questions about H21.50

Is H21.50 a billable ICD-10-CM code?: No. H21.50 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does H21.50 sit in the tabular list?: Diseases of the eye and adnexa (H00-H59), in the block Disorders of sclera, cornea, iris and ciliary body (H15-H22).
What cannot be coded together with H21.50?: H21.50 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above H21.50 (H21.5) and apply to it just the same.