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Billing code

G493A — Acth Test - Single Or Multiple, Per Injection

ACTH stimulation test

Bill G493 for an ACTH test of adrenal function, claiming the number of injections given.

Watch for: Bill the number of injections; add G700 only when the test is the sole reason for the visit, never in hospital.

Code

G493A

Description

Acth Test - Single Or Multiple, Per Injection

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

ACTH stimulation test for adrenal function, billed per injection given.

What it covers

G493 is an ACTH test, single or multiple, billed per injection (J41).

Other pituitary and adrenal stimulation tests on the same page include G501 (TRH or LHRH, per injection) and G497 (insulin hypoglycemia pituitary function test) (J41, J43).

Billing rules

• Billed per injection: claim the number of injections given (J41).
• Payable in addition to a consultation or assessment unless listed as included (J3).
• Includes preparing the patient, doing the test with monitoring afterwards, interpreting results with a written report to the referring provider where appropriate, and follow-up arrangements (J3).
• Marked (+): when the test is the sole reason for the visit, add G700 once per visit. G700 is not payable in hospital, and not when you are also paid a consultation or assessment that day and have a financial interest in the facility (J3).
• For a patient enrolled with a capitation-based group, G700 pays 15% of its fee (J3).

Often billed with

• G700 basic fee-per-visit premium when the test is the only reason for the visit, outside hospital (J3).

Related codes: G501, G497, G338, G344, G700

Source: Schedule of Benefits (July 1, 2026), Diagnostic and Therapeutic Procedures, Endocrinology and Metabolism, page J41; preamble J3.

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