Katherine Madison Macmillan, M.D.
Gastroenterology Physician · Simpsonville, SC
Katherine Madison Macmillan, M.D. is a gastroenterology physician with a practice address in Simpsonville, South Carolina, and NPI 1780117416, issued on Apr 10, 2017. Check the license (South Carolina 85580, as entered in NPPES) on the South Carolina Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Katherine Madison Macmillan
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License numbers
- 85580 SC
72379 AZ
009641 GA
Self-reported in NPPES; status is on the state search - Practice location
- 741 SE Main St, Simpsonville, SC 29681
- Phone
- (864) 522-8420
- Enumerated
- Apr 10, 2017
- Record last updated
- Feb 23, 2026
- Fax
- (864) 522-8425
- Medicare enrollment
- Enrolled (PECOS I20250616002806); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 303 in South Carolina → Look up another NPI →
Also registered at 741 SE Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jessica Boseman, NPFamily Nurse Practitioner1346194982
Verify Katherine Madison Macmillan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersSouth Carolina Board of Medical Examiners
Search for license 85580Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average gastroenterology physician in 2024
19 Medicare Part D claims for 15 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $40.65
2 payments; by number, the most common kind was food and beverage; the largest payer was Takeda Pharmaceuticals U.S.A., Inc. The 13,350 providers of this specialty with any payment received $5,015.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Prisma Health University Medical GroupSimpsonville, SC
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Katherine Madison Macmillan among 303 gastroenterology physician records in South Carolina
Katherine Madison Macmillan, M.D. is one of 303 gastroenterology physician records with a practice address in South Carolina. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2017, is newer than 88% of them.
- NPI issued2017 · 88% of these records are older, 8% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2017 · median 2005 among the 217 with a school on file
- Record last updated2026 · 48% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a South Carolina practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in South Carolina
There are 303 gastroenterology physician records in South Carolina.
All 303 in South Carolina → Every provider in Simpsonville → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Paul Thompson, MDSeneca, SC 296781992742902
- Kenneth Kunze, MDSunset, SC 296851396995973
- Wilcotte Rahming, M.D.Salem, SC 296761932180726
- Michael Busch, DOSeneca, SC 296721356622799
- Samuel Drake, M.D.Seneca, SC 296721871546978
- Andrew Motlis, MDSeneca, SC 296721083909402
- Irene Parker, MDSeneca, SC 296721366414997
- Karandeep Maur, MDGreer, SC 296501013209592
Common questions
What is Katherine Madison Macmillan, M.D.'s NPI number?
Katherine Madison Macmillan, M.D.'s National Provider Identifier (NPI) is 1780117416, issued on Apr 10, 2017. An NPI identifies a provider in billing; it is not a license.
Where is Katherine Madison Macmillan, M.D. located?
The NPPES record lists a practice address at 741 SE Main St, Simpsonville, SC, 29681. Phone: (864) 522-8420. Providers update this record themselves, so call before visiting.
How can I verify Katherine Madison Macmillan, M.D.'s license?
NPPES lists South Carolina license number 85580, as entered by the provider. Search the South Carolina Board of Medical Examiners at https://verify.llronline.com/LicLookup/Med/Med.aspx?div=22. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Katherine Madison Macmillan, M.D. prescribe under Medicare Part D?
In 2024, Katherine Madison Macmillan, M.D. had 19 Medicare Part D claims for 15 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.