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

Katherine Madison Macmillan, MD

Individual provider Internal Medicine Physician · NPI 1780117416

Katherine Madison Macmillan, MD is a Gastroenterology in Simpsonville, South Carolina. Qualified in 2017, 9 years ago. Practices with Prisma Health University Medical Group, a 2,446-clinician group, works from 3 locations and accepts Medicare assignment. Licensed in Arizona, Georgia and South Carolina.

Years since qualifying
9
Licensed in
AZ, GA, SC
In the registry since
2017
Specialties on file
4
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

741 SE Main St
Simpsonville, SC 29681-3237
Phone: (864) 522-8420
Fax: (864) 522-8425
Show map & directions

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

Additional practice locations (2)

  • 13400 E Shea Blvd, Scottsdale, AZ 85259-5499 — (480) 301-8000
  • 727 Se Main St Ste 340, Simpsonville, SC 29681-3249 — (864) 455-2888

Specialties & licences

Gastroenterology Physician (primary) Taxonomy 207RG0100X · Licence 85580 (SC)
Internal Medicine Physician Taxonomy 207R00000X · Licence 85580 (SC)
Internal Medicine Physician Taxonomy 207R00000X · Licence 009641 (GA)
Gastroenterology Physician Taxonomy 207RG0100X · Licence 72379 (AZ)

Record details

NPI number1780117416
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 10, 2017
Last updated in NPPESFebruary 23, 2026
Certification dateFebruary 23, 2026

Medicare enrollment

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

Medicare specialtyGASTROENTEROLOGY
Medical schoolOTHER
Graduated 2017 (9 years in practice)
Group practice Prisma Health University Medical Group — 2446 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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