Is H33.123 a billable ICD-10-CM code?

Yes. H33.123 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does H33.123 sit in the tabular list?

Diseases of the eye and adnexa (H00-H59), in the block Disorders of choroid and retina (H30-H36).

What cannot be coded together with H33.123?

H33.123 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 H33.123 (H33.1, H33) and apply to it just the same.

H33.123

H33.123 — Parasitic cyst of retina, bilateral

Billable / specific codeICD-10-CMbilateral

H33.123 is a billable, specific ICD-10-CM code for parasitic cyst of retina, bilateral. It is valid for submission on a claim.

Excludes1 inherited from the categories above H33.123

These are not written on H33.123, but they bind it: a note on a category applies to every code beneath it. Billing H33.123 with anything listed here is a denial.

Written on H33.1 — Retinoschisis and retinal cysts

congenital retinoschisis (Q14.1)
microcystoid degeneration of retina (H35.42-)

Written on H33 — Retinal detachments and breaks

detachment of retinal pigment epithelium (H35.72-, H35.73-)

Risk adjustment

H33.123 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.

Medicare coverage

H33.123 is named in 8 Medicare coverage policies — 8 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A53008Billing and Coding: Intraocular Bevacizumab
A53060Billing and Coding: Ophthalmology: Extended Ophthalmoscopy and Fundus Photography
A56726Billing and Coding: Ophthalmology: Posterior Segment Imaging (Extended Ophthalmoscopy and Fundus Photography)
A56729Billing and Coding: Magnetic Resonance Imaging of the Head and Neck

Code history

H33.123 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 H33.12. If H33.123 is not quite right, the correct code is usually one of these.

Questions about H33.123

Is H33.123 a billable ICD-10-CM code?: Yes. H33.123 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does H33.123 sit in the tabular list?: Diseases of the eye and adnexa (H00-H59), in the block Disorders of choroid and retina (H30-H36).
What cannot be coded together with H33.123?: H33.123 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 H33.123 (H33.1, H33) and apply to it just the same.