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

Individual provider Surgery Physician · NPI 1699739607

Dr. Reginald Kai Mason, MD practises General Surgery in Alton, Illinois. Qualified in 1995, 31 years ago. Practices with St Vincent Hospital, a 332-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Illinois, North Carolina and Virginia.

Years since qualifying
31
Licensed in
IL, NC, VA
In the registry since
2006
Specialties on file
3
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

2 Saint Anthonys Way Ste 105
Alton, IL 62002-4580
Phone: (618) 465-2761
Fax: (618) 465-4750
Show map & directions

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

Additional practice locations (1)

  • 500 Academy St S, Ahoskie, NC 27910-3248 — (804) 445-4643

Specialties & licences

Surgery Physician (primary) Taxonomy 208600000X · Licence 036169863 (IL)
Surgery Physician Taxonomy 208600000X · Licence 0101236379 (VA)
Surgery Physician Taxonomy 208600000X · Licence 2021-03370 (NC)

Record details

NPI number1699739607
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 14, 2006
Last updated in NPPESOctober 20, 2025
Certification dateOctober 20, 2025

Medicare enrollment

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

Medicare specialtyGENERAL SURGERY
Medical schoolOTHER
Graduated 1995 (31 years in practice)
Group practice St Vincent Hospital — 332 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations7 on file with Medicare

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Colonoscopy 41 times · 59th percentile
Upper gastrointestinal (GI) endoscopy for acid reflux 38 times · 59th percentile

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

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 patients106
Services billed 162 a service is one billed item, such as a visit, a test or a procedure
Average patient age70

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 St Vincent Hospital

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 332 clinicians in the practice; 12 are shown here.

Other providers in Alton