Billing code
G031A — Prothrombin Time
Office prothrombin time test
Bill G031 for a prothrombin time test done in your own office for your own patient.
Watch for: Chart the result, your interpretation and the treatment decision, or it isn't payable.
| Provider | Specialist | Assistant | Anaesthetist | Non-anaesthetist |
|---|---|---|---|---|
| $6.40 | $0.00 | $0.00 | $0.00 | $0.00 |
- Code
- G031A
- Description
- Prothrombin Time
- 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
Prothrombin time test done in the physician's own office for their own patient.
What it covers
G031 is a prothrombin time test listed under Miscellaneous Tests in Laboratory Medicine in Physician's Office (J67).
These tests are insured only when the physician (or a substitute) performs them in the physician's own office for the physician's own patient (J65).
Billing rules
- Miscellaneous Tests, including G031, may be claimed by any physician (J65).
- Chart the result, your interpretation and the treatment decision based on it, or it is not payable (J65).
- G031 is not on the list of office lab tests that trained staff may do while the physician is off site (GP63).
Often billed with
- G271 long-term anticoagulant supervision by phone, per month (J8).
Related codes: G271, G001, G002, G481, G489
Source: Schedule of Benefits (July 1, 2026), Diagnostic and Therapeutic Procedures, Laboratory Medicine, page J67.
APEX checks every paid claim against the Schedule of Benefits and flags codes billed below what the visit qualified for. See how APEX works · Pricing