What is OHIP billing code G812?

G812 is "Specular photomicroscopy, professional component", an OHIP Diagnostic & Therapeutic Procedures code from the Ontario Schedule of Benefits (Physician Services).

How much does G812 pay?

The current OHIP fee for G812 is $4.80, effective 2025-04-01, per the Ontario Schedule of Benefits.

How do I bill G812 to OHIP?

G812 is submitted through OHIP's MCEDT claims system, either directly or via billing software. SnapBill validates G812 claims against the Schedule of Benefits rules before submission.

All codes

G812

G812 – Specular photomicroscopy, professional component

OHIP Diagnostic & Therapeutic Procedures Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits

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Specular photomicroscopy – Examination of the cornea prior to intraocular surgery when affected by Fuch's corneal dystrophy, pseudophacic keratopathy, or other conditions that may compromise the corneal endothelium.

When to Use

Use G812 when performing pre-operative endothelial cell counts for patients with confirmed Fuch's corneal dystrophy scheduled for cataract surgery.
Apply this code for patients with pseudophacic bullous keratopathy requiring assessment of endothelial reserve prior to secondary intraocular procedures.
Select G812 when documenting the risk of corneal decompensation in patients with significant guttata prior to planned phacoemulsification.

Common Pitfalls

Billing G812 for routine pre-operative cataract assessments without a specific diagnosis of endothelial compromise is a common cause of audit recovery.
Submitting G812 in conjunction with a general eye exam code (A715) for the same encounter may trigger a rejection if the diagnostic necessity for the specular microscopy is not clearly linked to the specific corneal pathology.
Failure to document the specific corneal condition (e.g., Fuch's) in the clinical notes makes the claim vulnerable to reversal during a post-payment review.

Billing Tips

Ensure the diagnostic code (ICD-9) reflects the specific corneal dystrophy or pathology rather than a generic cataract code to support the medical necessity of the specular microscopy.
Only bill G812 when the professional interpretation of the photomicroscopy images is documented separately from the standard slit-lamp examination.

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Provider Fee$4.80

Effective: April 1, 2025

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