Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Mr. Mark Samuel Johnson, PA-CMTASCP

Individual provider Physician Assistant · NPI 1568453132

Mr. Mark Samuel Johnson, PA-CMTASCP is a Physician Assistant in Saint Charles, Missouri. Works from 3 locations. Licensed in Missouri.

Licensed in
MO
In the registry since
2005
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Practice location Address checks out

300 1st Capitol Dr
Saint Charles, MO 63301-2844
Phone: (636) 947-5000
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 100 Medical Plz, Lake St Louis, MO 63367-1366 — (636) 625-5200
  • 11111 Wilcrest Green Dr, Houston, TX 77042-4813 — (337) 521-2836

Specialties & licences

Physician Assistant (primary) Taxonomy 363A00000X · Licence 2010013488 (MO)

Record details

NPI number1568453132
Entity typeIndividual (Type 1)
GenderMale
Credentials PA-CMTASCP
Sole proprietorNo
NPI enumeratedNovember 2, 2005
Last updated in NPPESMarch 13, 2020
Certification dateMarch 13, 2020

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients235
Services billed 473 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $228 5 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Other providers in Saint Charles