What are the billing rules for Z851A?

Not payable for the same patient on the same day as E175 or Z844 (Y2). Not payable for the same patient on the same day as E186, E187 or E149; use E175 with those codes (Y2). This is a Z-code Independent Operative Procedure (IOP): if your major pre-operative visit was in the past 12 months, only a partial assessment (specialist) or minor assessment (GP) is payable before it that day; if the major pre-operative visit is the same day, no other assessment before it is payable (SP4).

Why is Z851A rejected?

ADH: OHIP describes this as 'Cannot be billed together': Z851 isn't payable the same day as Z844, E175, E186, E187 or E149 (Y2).

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Billing code

Z851A — Therapeutic paracentesis (anterior chamber)

Q: What is OHIP billing code Z851A?

Therapeutic paracentesis of the eye, listed under the Cornea procedures. When done with E186, E187 or E149, bill E175 instead.

Therapeutic eye paracentesis

Bill for therapeutic paracentesis of the eye's anterior chamber.

Watch for: When done with E186, E187 or E149, bill the add-on E175 instead; not payable the same day as Z844.

Provider	Specialist	Assistant	Anaesthetist	Non-anaesthetist
$70.00	$0.00	$0.00	$95.76	$95.76

Code: Z851A
Description: Therapeutic paracentesis (anterior chamber)
FHO+ basket: Not in the FHO+ base rate basket (Schedule 2 or 2B).
Effective date: Apr 1, 2026
Termination date: No end date

Explanation

Updated October 26, 2026

Therapeutic paracentesis of the eye, listed under the Cornea procedures. When done with E186, E187 or E149, bill E175 instead.

What it covers

Z851 is a therapeutic paracentesis, listed under Cornea in the Ocular Surgical Procedures (Y2).

When the therapeutic paracentesis is done with an intravitreal injection (E186 or E187) or vitreous injection or aspiration (E149), it is billed as the add-on E175 rather than Z851 (Y2).

Billing rules

Not payable for the same patient on the same day as E175 or Z844 (Y2).
Not payable for the same patient on the same day as E186, E187 or E149; use E175 with those codes (Y2).
This is a Z-code Independent Operative Procedure (IOP): if your major pre-operative visit was in the past 12 months, only a partial assessment (specialist) or minor assessment (GP) is payable before it that day; if the major pre-operative visit is the same day, no other assessment before it is payable (SP4).
An anaesthetic or nerve block you give for your own procedure is not payable (SP5).
Age premiums of 10% to 30% apply for patients under 16 (GP64).

Common rejections

ADH: OHIP describes this as 'Cannot be billed together': Z851 isn't payable the same day as Z844, E175, E186, E187 or E149 (Y2).

Related codes: Z844, E175, E186, E187, E149, E128

Source: Schedule of Benefits (July 1, 2026), Ocular Surgical Procedures, Cornea, page Y2.

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