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Billing code

A628A — Partial Assessment

Clinical immunology partial assessment

Bill A628 for a limited clinical immunology visit: history of the complaint, the needed exam, advice and a record.

Watch for: No other visit service is payable the same day as food allergy immunotherapy (A620) or its support fee (K621).

Code

A628A

Description

Partial 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 partial assessment: history of the presenting complaint, the necessary exam, advice to the patient and a record.

What it covers

A628 is the partial assessment in the Clinical Immunology (62) listing (A83). A partial assessment is the limited service that constitutes a history of the presenting complaint, the necessary physical examination, advice to the patient and an appropriate record (GP25).

Billing rules

• At an allergy injection visit, an assessment is payable with the injection when the patient also has an acute or unrelated problem that would otherwise need its own visit; G202 is then limited to 2 (J4).
• A partial assessment is one of the assessments the E078 chronic disease premium can be added to (GP25).
• Detention (K001) can only start after 30 minutes (GP30).
• 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

• G202 hyposensitisation injection, maximum 2 when an assessment is payable for the same visit (J4).
• 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).
• K301A when the 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.
• 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.
• A4D: A628 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.
• V21: OHIP's description is 'diagnostic code required': the claim had no diagnostic code. Add the code for the main reason for the visit; with E078 it must be one from the GP26 list (GP26).

Related codes: A624, A623, A621, G202, G212, E078

Source: Schedule of Benefits (July 1, 2026), Consultations and Visits, Clinical Immunology (62), page A83; General Preamble GP25 (partial assessment) and GP30; Allergy J4

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