Katherine MacmillanM.D.
Gastroenterology·Simpsonville, SC
Katherine Macmillan, M.D. is a Gastroenterology provider in Simpsonville, SC affiliated with 1 ambulatory surgery center in AZ, as of July 2026.
- NPI1780117416
- Registered2017
- Centers1
- StateAZ
- Class of2017
Case volumes, referral patterns, and payer mix live in DataLily AI Insights.
Ambulatory surgery centers
Centers whose service lines match this provider’s. Affiliations change; verify independently.
Katherine Macmillan at a glance
- Provider
- Katherine Macmillan
- Credential
- M.D.
- Specialty
- Gastroenterology
- Procedures
- Gastroenterology CPT codes
- Location
- Simpsonville, SC
- Medical school graduation
- 2017
- NPI registered
- 2017
- NPI
- 1780117416
- Snapshot
- July 2026
Identity, specialty, and affiliations change over time. This is not an endorsement, and not clinical, billing, or legal advice. Providers may request corrections at founders@datalilyai.com. Read the DataLily AI data methodology.
Questions
Where does Katherine Macmillan practice?
Katherine Macmillan, M.D. is based in Simpsonville, SC and is affiliated with 1 ambulatory surgery center: Mayo Clinic Arizona Dba Mayo Clinic Scottsdale in Scottsdale, AZ. Affiliations reflect the current DataLily AI snapshot (July 2026) and can change.
What is Katherine Macmillan's NPI number?
Katherine Macmillan's National Provider Identifier (NPI) is 1780117416, registered in 2017. Specialty on record: Gastroenterology; credential M.D.
How many Gastroenterology providers in South Carolina work at ambulatory surgery centers?
88 Gastroenterology surgeons and proceduralists in South Carolina are affiliated with ambulatory surgery centers in DataLily AI's current snapshot, Katherine Macmillan among them. The South Carolina Gastroenterology directory lists each one by city with credential, NPI, and center affiliations.
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