G9843 – Ras (kras or nras) gene mutation
HCPCS Level II code · G codes: Procedures / Professional Services (Temporary)
HCPCS codeG9843
- Long description
- Ras (kras or nras) gene mutation
- Short description
- Kras or nras gene mutation
- Pricing indicator
00Not separately priced by Part B (bundled, not covered or Part A only)- Medicare coverage
CCarrier judgment – coverage decided by the Medicare contractor- BETOS category
Z2Undefined codes- Added
- January 1, 2017
- Last change
- January 1, 2018 – No change
Frequently asked questions
What is HCPCS code G9843?
G9843 is a HCPCS Level II code for ras (kras or nras) gene mutation.
Does Medicare cover G9843?
The HCPCS file lists coverage code C: Carrier judgment – coverage decided by the Medicare contractor. Coverage and payment also depend on local coverage determinations and the patient’s plan.
Nearby G codes
- G9835 – Trastuzumab administered within 12 months of diagnosis
- G9836 – Reason for not administering trastuzumab documented (e.g. patient declined, patient died, patient transferred, contraindication or other clinical exclusion, neoadjuvant chemotherapy or radiation not complete)
- G9837 – Trastuzumab not administered within 12 months of diagnosis
- G9838 – Patient has metastatic disease at diagnosis
- G9839 – Anti-egfr monoclonal antibody therapy
- G9840 – Ras (kras and nras) gene mutation testing performed before initiation of anti-egfr moab
- G9841 – Ras (kras and nras) gene mutation testing not performed before initiation of anti-egfr moab
- G9842 – Patient has metastatic disease at diagnosis
- G9844 – Patient did not receive anti-egfr monoclonal antibody therapy
- G9845 – Patient received anti-egfr monoclonal antibody therapy
- G9846 – Patients who died from cancer
- G9847 – Patient received systemic cancer-directed therapy in the last 14 days of life
- G9848 – Patient did not receive systemic cancer-directed therapy in the last 14 days of life
- G9849 – Patients who died from cancer
- G9850 – Patient had more than one emergency department visit in the last 30 days of life
- G9851 – Patient had one or less emergency department visits in the last 30 days of life
Source: CMS HCPCS Level II quarterly file, October 2026. Reference only – check payer policy before billing.