Physician

Karen Antwiler, M.D.

According to 2025 Medicare claims, Karen Antwiler, M.D. (NPI: 1598255465) practices addiction medicine in the Riverside-San Bernardino-Ontario, CA market, with the plurality of this provider's patient population coming from Riverside, CA. This provider's primary affiliated billing organization is EISENHOWER MEDICAL CENTER (NPI: 1013981554; TIN: 956130458) and primary practice location at 92234-5412.

Antwiler's data goes back to 2015 and runs through 2024. For example, in 2024, this provider had 126 traditional Medicare patients, billed 574 HCPCS/CPT codes, and received $50,272 in Medicare payments. The top billing code was 99223 (Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes). Part D data shows 373 prescription claims across 83 beneficiaries totaling $38,872 in drug costs, led by Buprenorphine-Naloxone (Buprenorphine Hcl/Naloxone Hcl). Open Payments data shows 7 records totaling $254. You can download detailed data with all billing codes (2015-2024). For more recent data, please contact us.

Over the past 10 years, this provider has fewer than 5 years of reported Medicare Part B carrier billing data, so a reliable trend cannot be assigned. Concurrently, this provider has fewer than 5 years of reported Part D prescription costs data, so a reliable trend cannot be assigned. For DME billing, this provider has fewer than 5 years of reported data, so a reliable trend cannot be assigned.