Is H10.21 a billable ICD-10-CM code?

No. H10.21 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does H10.21 sit in the tabular list?

Diseases of the eye and adnexa (H00-H59), in the block Disorders of conjunctiva (H10-H11).

What cannot be coded together with H10.21?

H10.21 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

H10.21

H10.21 — Acute toxic conjunctivitis

Non-billable headerICD-10-CM

H10.21 is a non-billable header ICD-10-CM code for acute toxic conjunctivitis. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

burn and corrosion of eye and adnexa (T26.-)

Code first

The underlying condition must be sequenced before this code.

(T51-T65) to identify chemical and intent

Inclusion terms

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

Acute chemical conjunctivitis

Risk adjustment

H10.21 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 H10.21

4 child codes. Green means billable.

Related codes at this level

Codes that share H10.2. If H10.21 is not quite right, the correct code is usually one of these.

Questions about H10.21

Is H10.21 a billable ICD-10-CM code?: No. H10.21 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does H10.21 sit in the tabular list?: Diseases of the eye and adnexa (H00-H59), in the block Disorders of conjunctiva (H10-H11).
What cannot be coded together with H10.21?: H10.21 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.