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Billing code

G200A — Acute Desensitisation, E.g. Ats, Penicillin

Acute desensitisation

Bill G200 for acute desensitisation to an agent such as ATS or penicillin; add G700 when procedures are the sole reason for the visit.

Watch for: Hospital desensitisation with a significant risk of life-threatening anaphylaxis is G185, not G200.

Code

G200A

Description

Acute Desensitisation, E.g. Ats, Penicillin

FHO+ basket

Not in the FHO+ base rate basket (Schedule 2 or 2B).

Effective date

Apr 1, 2025

Termination date

No end date

Explanation

Updated October 26, 2026

Acute desensitisation, for example to ATS or penicillin. A (+) procedure, so G700 applies when it is the sole reason for the visit.

What it covers

G200 is acute desensitisation to an agent such as ATS or penicillin (J4). Drug desensitisation in a hospital with full cardioresuscitative equipment, because of a significant risk of life-threatening anaphylaxis and under direct, ongoing physician attendance, is the separate code G185 (J4).

Billing rules

• Marked (+): when procedures are the sole reason for the visit, add G700 once per visit, however many (+) procedures are done (J3, J4).
• G700 is not payable in hospital, and is paid at 15% for patients enrolled to a capitation-based group (J3).
• Payable in addition to a consultation or assessment (J3).
• For hospital desensitisation where life-threatening anaphylaxis is a significant risk, bill G185 instead (J4).

Often billed with

• G700 when desensitisation is the only reason for the visit (J3).
• An assessment such as A007 or A001 when the patient is also assessed (J3).

Related codes: G185, G700, G202, G212, G196

Source: Schedule of Benefits (July 1, 2026), Diagnostic and Therapeutic Procedures, Allergy, page J4; G700 rules on J3

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