Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
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Mark A Mason, MD

Individual provider Emergency Medicine Physician · NPI 1134167091

Mark A Mason, MD practises Emergency Medicine in Kirkwood, Missouri. Graduated from University of Michigan Medical School in 1985, 41 years ago. Practices with SSM Health Care Group, a 923-clinician group and accepts Medicare assignment. Licensed in Missouri.

Years since qualifying
41
Trained at
University of Michigan Medical School
Licensed in
MO
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

525 Couch Ave
Kirkwood, MO 63122-5536 Not confirmed with CMS for 12 years — call before visiting
Phone: (314) 966-1500
Fax: (314) 966-1681
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence 102434 (MO)

Record details

NPI number1134167091
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 3, 2006
Last updated in NPPESSeptember 26, 2014

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyEMERGENCY MEDICINE
Also practisesFAMILY PRACTICE
Medical schoolUNIVERSITY OF MICHIGAN MEDICAL SCHOOL
Graduated 1985 (41 years in practice)
Group practice Ssm Health Care Group — 923 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

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 patients114
Services billed 122 a service is one billed item, such as a visit, a test or a procedure
Average patient age72

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.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at SSM Health Care Group

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 923 clinicians in the practice; 12 are shown here.

Other providers in Kirkwood