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Billing code

A624A — Medical Specific Re-assessment

Clinical immunology follow-up assessment

Bill A624 for a clinical immunologist's follow-up with a full relevant history and exam of one or more systems.

Watch for: Limited to two per patient per physician per 12 months, except hospital admission re-assessments; extras pay as a lesser assessment.

Code

A624A

Description

Medical Specific Re-assessment

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

Clinical immunology medical specific re-assessment: full relevant history and exam of one or more systems. Two per patient per physician per 12 months.

What it covers

A624 is the medical specific re-assessment in the Clinical Immunology (62) listing (A83). It requires a full, relevant history and a physical examination of one or more systems (GP23).

A hospital admission assessment is treated as a medical specific re-assessment when the same physician assessed the patient for the same illness before admitting them (GP23).

Billing rules

• Two per patient per physician per consecutive 12 months, except re-assessments for hospital admissions; extra ones pay as a lesser assessment (GP23).
• For a complex, obscure or serious condition with a written report to the primary care physician, the complex medical specific re-assessment A621 applies instead (GP24).
• In hospital in-patients, bill C624 (A84).
• No other Consultations and Visits service is payable for the same patient on the same day as A620 (initiation of food allergy immunotherapy) or K621 (FAIT support) (A83, A84).
• Can be billed by video or telephone as comprehensive virtual care when an existing patient-physician relationship exists, with K300A or K301A; telephone pays 85% (AJ1, A66, A70).

Often billed with

• E078 chronic disease assessment premium (+50%) in the office or a hospital out-patient clinic (not the ED), for an established chronic disease with a GP26 diagnostic code on the claim (A83, GP25-GP26).
• G209 (technical) and G197 (professional) skin tests, billed per test, each to a maximum of 50 per year (J5).
• K301A when the re-assessment is done by telephone (A70).

Common rejections

• EQ2: The specialty code on the claim wasn't registered and active for the physician on the service date. Correct it, or update the registration, then resubmit.
• A4D: A624 is in the Clinical Immunology (62) listing, and specialists bill consultations and visits from their own specialty's listing (GP9). A claim under another registered specialty rejects; bill that specialty's code instead.
• EH2: The health card version code on the claim doesn't match OHIP's record, often because the patient has a newer card; get the current version code and resubmit.

Related codes: A623, A621, A628, A625, E078, C624

Source: Schedule of Benefits (July 1, 2026), Consultations and Visits, Clinical Immunology (62), pages A83-A84; General Preamble GP23 (medical specific re-assessment)

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