Is H10.509 a billable ICD-10-CM code?

Yes. H10.509 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does H10.509 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 H10.509?

H10.509 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 H10.509 (H10) and apply to it just the same.

H10.509

H10.509 — Unspecified blepharoconjunctivitis, unspecified eye

Billable / specific codeICD-10-CMunspecified

H10.509 is a billable, specific ICD-10-CM code for unspecified blepharoconjunctivitis, unspecified eye. It is valid for submission on a claim.

Excludes1 inherited from the categories above H10.509

These are not written on H10.509, but they bind it: a note on a category applies to every code beneath it. Billing H10.509 with anything listed here is a denial.

Written on H10 — Conjunctivitis

keratoconjunctivitis (H16.2-)

Risk adjustment

H10.509 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

H10.509 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Related codes at this level

Codes that share H10.50. If H10.509 is not quite right, the correct code is usually one of these.

Questions about H10.509

Is H10.509 a billable ICD-10-CM code?: Yes. H10.509 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does H10.509 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 H10.509?: H10.509 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 H10.509 (H10) and apply to it just the same.