John Edward Marquez, PA-C

John Marquez practices at Quest Diagnostics in Saint Louis, Missouri.

John Marquez's NPI, 1023153723, was assigned on February 20, 2007. John Marquez holds Colorado license 1594.

John Marquez's primary practice is Quest Diagnostics, at 2040 Concourse Dr, Saint Louis, MO 63146 in Saint Louis County. The practice phone is (913) 895-2400.

John Marquez's primary practice is Quest Diagnostics in Saint Louis, Missouri. The medical group on file is Achieve Health Clinic. Dmand AI also links John Marquez to 1 more group practice or clinic, named with a free account.

Dmand AI tracks the electronic health record (EHR) system at each site where John Marquez practices. Vendor and product names are available with a free account.

Medical is John Marquez's primary specialty in the NPI Registry, under taxonomy code 363AM0700X. John Marquez is licensed in Colorado.

CMS counts 124 Medicare patients who saw John Marquez in 2024. The largest group is 75 to 84, with 37 patients. 67% of them have high blood pressure, and 52% have high cholesterol. 42% are also on Medicaid. Their average risk score is 2.06, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.

Across all payers, Dmand AI patient panel data puts John Marquez's median patient age at 50, with 31% women.

In 2024, John Marquez wrote 3,213 Medicare Part D claims for 221 patients. 86% of them were for generic drugs.

John Marquez accepts Medicare assignment, so Medicare's approved amount is taken as full payment.

CMS Open Payments shows 50 general payments to John Marquez from 12 drug and device companies in 2025. Food and beverage make up the largest share, 100% of the total. Gilead Sciences, Inc. paid the most, $368.