Is H21 a billable ICD-10-CM code?

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

Where does H21 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).

H21

H21 — Other disorders of iris and ciliary body

Non-billable headerICD-10-CM

H21 is a non-billable header ICD-10-CM code for other disorders of iris and ciliary body. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes2 — not included here, but may coexist

The excluded condition is not part of this code, but a patient can have both. You may code both.

sympathetic uveitis (H44.1-)

Risk adjustment

H21 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 to one of these instead H21

8 child codes. Green means billable.

Questions about H21

Is H21 a billable ICD-10-CM code?: No. H21 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does H21 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).