Dr. William E. Karnes Jr., MD

Dr. Karnes practices at UCI Health - Orange in Orange, California, part of UC Irvine.

Dr. Karnes' NPI, 1881652998, was assigned on May 1, 2006. Dr. Karnes graduated from University Of Minnesota Medical School in 1982. Dr. Karnes holds California license G57458.

Dr. Karnes' primary practice is UCI Health - Orange, at 101 City Drive South, Orange, CA 92868 in Orange County. The practice phone is (714) 456-7890.

Dr. Karnes' primary practice is UCI Health - Orange in Orange, California, part of UC Irvine. The medical group on file is UCI Health Physicians. Dmand AI also links Dr. Karnes to 1 more group practice or clinic and 1 medical group, each named with a free account.

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Karnes practices, 2 sites in all. Vendor and product names are available with a free account.

Gastroenterology is Dr. Karnes' primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Karnes is board certified in gastroenterology by the American Board of Internal Medicine. Dmand AI has Dr. Karnes' licenses on file in 2 states: California and Minnesota.

Dmand AI lists acid reflux, anxiety, chronic anemia, chronic indigestion, fibromyalgia and chronic pain, gastroduodenitis, gastroenteritis and gastrointestinal bleeding among the conditions Dr. Karnes treats.

CMS data shows 827 Medicare services from Dr. Karnes across 17 procedure codes in 2024, for 580 Medicare patients. Medicare paid $105,529 for them.

CMS counts 580 Medicare patients who saw Dr. Karnes in 2024. The largest group is 65 to 74, with 288 patients. 75% of them have high cholesterol, and 68% have high blood pressure. 33% are also on Medicaid. Their average risk score is 1.79, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.

Across all payers, Dmand AI patient panel data puts Dr. Karnes' median patient age at 58, with 56% women.

In 2024, Dr. Karnes wrote 1,323 Medicare Part D claims for 553 patients. 78% of them were for generic drugs. CMS names the drug for 1,151 of them, across 19 drugs with 11 or more claims each, at $246,371 in total drug cost. In 2023, CMS named 1,153 claims across 19 drugs.

CMS publishes a Merit-based Incentive Payment System (MIPS) score of 100 out of 100 for Dr. Karnes for performance year 2024, reported through an alternative payment model (APM). Dr. Karnes accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Karnes as offering telehealth. CMS counts 260 procedures of colonoscopy by Dr. Karnes, more than 96% of the clinicians it reports for that procedure.

Dmand AI links 46 papers to Dr. Karnes, published from 2013 to 2023. 2020 was the busiest year, with 3. The most frequent topics are Colonoscopy, Adenoma and Colorectal Neoplasms. Dr. Karnes has published most often in Gastroenterology. Dr. Karnes' most frequent co-authors are Jason Buddika Samarasena, MD, Alexander Philip Abadir, MD and Tyler M. Berzin, MD.

CMS Open Payments shows 36 general payments to Dr. Karnes from 8 drug and device companies from 2016 to 2025. Consulting fees make up the largest share, 84% of the total. Medivators Inc. paid the most, $18,749.

Dmand AI lists 7 awards for Dr. Karnes, most recently AGA Fellow in 2011.

Dr. Karnes graduated from University Of Minnesota Medical School in 1982. Dr. Karnes is a member of AGA.

Dr. Karnes is in network with 13 carriers, including Aetna, Elevance and Blue Cross Blue Shield of Michigan. PPO plans come from the most carriers, 9. Check the plan with the practice before a visit.