Dr. Matthew A. Pieper, DO

Dr. Pieper practices at Mercy Clinic Trauma and General Surgery in Saint Louis, Missouri.

Dr. Pieper's NPI, 1598920647, was assigned on July 28, 2008. Dr. Pieper graduated from At Still University of Health Sciences, College of Osteo Med, Kirksville in 2006. Dr. Pieper holds Missouri license 2008011543.

Dr. Pieper's primary practice is Mercy Clinic Trauma and General Surgery, at 621 S New Ballas Rd, Saint Louis, MO 63141 in Saint Louis County. The practice phone is (314) 251-6440.

Dr. Pieper's primary practice is Mercy Clinic Trauma and General Surgery in Saint Louis, Missouri. Dr. Pieper is also affiliated with Mercy Hospital St. Louis. The medical group on file is Mercy Clinic Trauma and General Surgery. Dmand AI also links Dr. Pieper to 1 more hospital, 3 group practices and clinics and 3 medical groups, each named with a free account.

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

Surgery is Dr. Pieper's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Pieper is licensed in Missouri.

CMS data shows 27 Medicare services from Dr. Pieper across 1 procedure code in 2024, all of them office visits, for 106 Medicare patients. Medicare paid $1,848 for them. Every service was in an office.

CMS counts 106 Medicare patients who saw Dr. Pieper in 2026. The largest group is 65 to 74, with 45 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 10% are also on Medicaid. Their average risk score is 1.96, 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. Pieper's median patient age at 60, with 49% women.

In 2026, Dr. Pieper wrote 101 Medicare Part D claims for 70 patients. 99% of them were for generic drugs. CMS names the drug for 66 of them, across 2 drugs with 11 or more claims each, at $514 in total drug cost. In 2023, CMS named 47 claims across 2 drugs.

Dr. Pieper accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 14 procedures of hernia repair (minimally invasive) by Dr. Pieper, more than 80% of the clinicians it reports for that procedure.

Colonoscopy: 1 to 10 procedures (CMS shows small counts as a range)

Hernia repair - groin (open): 1 to 10 procedures (CMS shows small counts as a range)

Removal or shaving of skin growth: 1 to 10 procedures (CMS shows small counts as a range)

Upper gastrointestinal (GI) endoscopy for acid reflux: 1 to 10 procedures (CMS shows small counts as a range)

Dmand AI links 1 paper to Dr. Pieper in 2022.

CMS Open Payments shows 43 general payments to Dr. Pieper from 11 drug and device companies from 2016 to 2025. Education make up the largest share, 58% of the total. Intuitive Surgical, Inc. paid the most, $7,467.

Dr. Pieper graduated from At Still University of Health Sciences, College of Osteo Med, Kirksville in 2006.