Alexander E. Stempel

Alexander Stempel practices at Vallejo Medical Center in Vallejo, California, part of Kaiser Permanente.

Alexander Stempel's NPI, 1659764611, was assigned on March 13, 2015. Alexander Stempel holds California license 52363.

Alexander Stempel's primary practice is Vallejo Medical Center, at 975 Sereno Dr, Vallejo, CA 94589 in Solano County. The practice phone is (707) 651-1000.

Alexander Stempel's primary practice is Vallejo Medical Center in Vallejo, California, part of Kaiser Permanente. The medical group on file is The Permanente Medical Group, Inc. Dmand AI also links Alexander Stempel to 4 more medical groups, 1 group practice or clinic, 1 home health agency, 1 hospice and 1 other site, each named with a free account.

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

Physician assistant is Alexander Stempel's primary specialty in the NPI Registry, under taxonomy code 363A00000X. Alexander Stempel is licensed in California.

CMS counts 119 Medicare patients who saw Alexander Stempel in 2026. The largest group is 65 to 74, with 55 patients. 70% of them have high cholesterol, and 63% have high blood pressure. 15% are also on Medicaid. Their average risk score is 0.94, where 1.00 is the Medicare average.

Across all payers, Dmand AI patient panel data puts Alexander Stempel's median patient age at 45, with 60% women.

In 2026, Alexander Stempel wrote 236 Medicare Part D claims for 196 patients. 90% of them were for generic drugs.

CMS publishes a Merit-based Incentive Payment System (MIPS) score of 89 out of 100 for Alexander Stempel for performance year 2026, reported as part of a group. Alexander Stempel accepts Medicare assignment, so Medicare's approved amount is taken as full payment.