G9504 HCPCS code: Documented reason for not assessing hepatitis b virus (hbv) status (e.g., patient not initiating anti-tnf therapy, patient declined) prior to initiating anti-tnf therapy
G9504 is the HCPCS Level II code for documented reason for not assessing hepatitis b virus (hbv) status (e.g., patient not initiating anti-tnf therapy, patient declined) prior to initiating anti-tnf therapy. Its Medicare coverage code is C (Carrier judgment): Coverage is decided by the Medicare contractor (MAC) case by case.
Code details
| Field | Value |
|---|---|
| Section | G codes — Procedures and professional services (temporary) |
| Coverage code | C — Carrier judgment |
| Pricing indicator | 00 — Not separately priced by Medicare |
| BETOS category | Z2 |
| Added | 2016-01-01 |
| Last action effective | 2018-01-01 |
What changed for G9504
- 2016-01-01: G9504 added to HCPCS Level II
- Next scheduled CMS quarterly update (HCPCS and DMEPOS fee schedule): 2027-01-01
Frequently asked questions
What is HCPCS code G9504?
G9504 is the HCPCS Level II code for documented reason for not assessing hepatitis b virus (hbv) status (e.g., patient not initiating anti-tnf therapy, patient declined) prior to initiating anti-tnf therapy. Short descriptor: "Doc rsn hep b stat not asses".
Does Medicare cover G9504?
Coverage code C — Carrier judgment. Coverage is decided by the Medicare contractor (MAC) case by case.
Related G95 codes
- G9500 — Radiation exposure indices documented in final report for procedure using fluoroscopy
- G9501 — Radiation exposure indices not documented in final report for procedure using fluoroscopy, reason not given
- G9502 — Documentation of medical reason for not performing foot exam (i.e., patients who have had either a bilateral amputation above or below the knee, or both a left and right amputation above or below the knee before or during the measurement period)
- G9503 — Patient taking tamsulosin hydrochloride
- G9505 — Antibiotic regimen prescribed within 10 days after onset of symptoms for documented medical reason
- G9506 — Biologic immune response modifier prescribed
- G9507 — Documentation that the patient is on a statin medication or has documentation of a valid contraindication or exception to statin medications; contraindications/exceptions that can be defined by diagnosis codes include pregnancy during the measurement period, active liver disease, rhabdomyolysis, end stage renal disease on dialysis and heart failure; provider documented contraindications/exceptions include breastfeeding during the measurement period, woman of child-bearing age not actively taking birth control, allergy to statin, drug interaction (hiv protease inhibitors, nefazodone, cyclosporine, gemfibrozil, and danazol) and intolerance (with supporting documentation of trying a statin at least once within the last 5 years or diagnosis codes for myostitis or toxic myopathy related to drugs)
- G9508 — Documentation that the patient is not on a statin medication
- G9509 — Adult patients 18 years of age or older with major depression or dysthymia who reached remission at twelve months as demonstrated by a twelve month (+/-60 days) phq-9 or phq-9m score of less than 5
- G9510 — Adult patients 18 years of age or older with major depression or dysthymia who did not reach remission at twelve months as demonstrated by a twelve month (+/-60 days) phq-9 or phq-9m score of less than 5. either phq- 9 or phq-9m score was not assessed or is greater than or equal to 5
- G9511 — Index event date phq-9 or phq-9m score greater than 9 documented during the twelve month denominator identification period
- G9512 — Individual had a pdc of 0.8 or greater
Building a device that would bill under a code like this? Caduvo matches a device description to HCPCS/CPT codes, Medicare coverage and payment, and the FDA pathway in one report.
Next steps
- Run a reimbursement report for a device billed under G9504
- Watch G9504 for fee, coverage and descriptor changes
- Build a full Medicare revenue model for G9504
Sources: CMS HCPCS Level II release October 2025; CMS DMEPOS fee schedule; CMS NCCI MUE tables; CMS Medicare utilization (physician and DME supplier files); CMS Medicare Coverage Database articles. Fees are Medicare allowables, not commercial rates. Not billing or legal advice.