Doctor profile · Federal record
Dr. Katherine Macmillan, M.D.
Gastroenterology Physician (CMS: Gastroenterology) · Internal Medicine Physician · Internal Medicine Physician · Gastroenterology Physician · Simpsonville, SC
- NPI 1780117416
- Accepts Medicare
- 9 yrs in practice
- Licensed in 3 states
- Female
- Group practice
- No sanctions
Practice & contact
Operates at 3 locations .
- Primary practice
-
741 Se Main St
Simpsonville, SC 296813237
(864) 522-8420
fax (864) 522-8425 - Additional location
-
727 Se Main St Ste 340
Simpsonville, SC 296813249
(864) 455-2888
fax (864) 455-2885 - Additional location
-
13400 E Shea Blvd
Scottsdale, AZ 852595499
(480) 301-8000 - Mailing address
-
300 E McBee Ave Ste 300
Greenville, SC 296012899
Credentials & registration
- NPI registered
- April 2017 — 9 yrs on file
- Profile last updated
- February 23, 2026
- Year of graduation
- 2017 — 9 yrs since
- Specialty taxonomy
- 207RG0100X — NUCC code
- State licenses (3)
- South Carolina #85580 · Georgia #009641 · Arizona #72379
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1780117416. Last verified May 11, 2026.Open Payments
Industry payments received
All-time total
$41
Transactions
2
Manufacturers
2
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Takeda Pharmaceuticals U.S.A., INC. | 1 | $25.58 | |
| Phathom Pharmaceuticals, INC. | 1 | $15.07 |
By nature of payment
Hospital affiliations
Frequently asked questions
What is Dr. Katherine Macmillan's medical specialty?
Dr. Katherine Macmillan practices Gastroenterology Physician in Simpsonville, SC.
Where does Dr. Katherine Macmillan practice?
Dr. Katherine Macmillan practices at 741 Se Main St, Simpsonville, SC 296813237. Office phone: 8645228420.
What is Dr. Katherine Macmillan's NPI?
Dr. Katherine Macmillan's National Provider Identifier (NPI) is 1780117416, issued by NPPES.
Does Dr. Katherine Macmillan accept Medicare assignment?
Yes. Dr. Katherine Macmillan accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.