Karen Michelle Hemmer, PA-C

Karen Hemmer practices at Northern Ohio Medical Specialists in Port Clinton, Ohio.

Karen Hemmer's NPI, 1144461047, was assigned on March 23, 2009.

Karen Hemmer's primary practice is Northern Ohio Medical Specialists, at 611 Fulton St, Port Clinton, OH 43452 in Ottawa County. The practice phone is (419) 609-1112.

Karen Hemmer's primary practice is Northern Ohio Medical Specialists in Port Clinton, Ohio. Karen Hemmer is also affiliated with Magruder Hospital. The medical group on file is NOMS Healthcare. Dmand AI also links Karen Hemmer to 2 more hospitals, 2 group practices and clinics and 1 medical group, each named with a free account.

Dmand AI tracks the electronic health record (EHR) system at each site where Karen Hemmer practices, 5 sites in all. Vendor and product names are available with a free account.

Physician assistant is Karen Hemmer's primary specialty in the NPI Registry, under taxonomy code 363A00000X.

CMS counts 241 Medicare patients who saw Karen Hemmer in 2024. The largest group is 65 to 74, with 104 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 9% are also on Medicaid. Their average risk score is 1.14, where 1.00 is the Medicare average.

Across all payers, Dmand AI patient panel data puts Karen Hemmer's median patient age at 66, with 63% women.

In 2024, Karen Hemmer wrote 5,112 Medicare Part D claims for 650 patients. 89% of them were for generic drugs.

Karen Hemmer accepts Medicare assignment, so Medicare's approved amount is taken as full payment.

CMS Open Payments shows 59 general payments to Karen Hemmer from 18 drug and device companies in 2025. Food and beverage make up the largest share, 100% of the total. Bayer HealthCare Pharmaceuticals Inc. paid the most, $158.