Casey M. McMillan, MD
Internal Medicine Physician · Columbia, SC
Casey M. McMillan, MD is an internal medicine physician with a practice address in Columbia, South Carolina, and NPI 1861526790, issued on Mar 15, 2007. Check the license (South Carolina 26958, as entered in NPPES) on the South Carolina Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Casey M. McMillan
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 26958 SC
89586 GA
Self-reported in NPPES; status is on the state search - Practice location
- 111 Doctor Cir, Columbia, SC 29203
- Phone
- (800) 491-0909
- Enumerated
- Mar 15, 2007
- Record last updated
- Aug 21, 2025
- Medicaid ID
- 269587 SC
- Medicare enrollment
- Enrolled (PECOS I20090115000192); accepts Medicare assignment
- Medical or professional school
- Medical College Of Georgia School Of Medicine, 2004
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 1,881 in South Carolina → Look up another NPI →
Also registered at 111 Doctor Cir
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Dana Addison, APRNAcute Care Nurse Practitioner1861940231
- Melanie All, APRNAcute Care Nurse Practitioner1811499593
- Shantai Allen, APRNFamily Nurse Practitioner1598320046
- Mylene Antonio, APRNGerontology Nurse Practitioner1235779281
- Juanita Aviles, APRNFamily Nurse Practitioner1497273965
- Katherine Barnes, APRNFamily Nurse Practitioner1851021661
Verify Casey M. McMillan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersSouth Carolina Board of Medical Examiners
Search for license 26958Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
77% fewer Medicare Part D claims than the average internal medicine physician in 2024
746 Medicare Part D claims for 260 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 160 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen122 claims
- Atorvastatin Calcium31 claims
- Gabapentin24 claims
- Oxycodone-Acetaminophen21 claims
- Levothyroxine Sodium20 claims
- Furosemide19 claims
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.
The MIPS final score for 2023 (Medicare payment program): 87.8 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Bills Medicare through 2 group practices
- SC House Calls IncWest Columbia, SC
- Select Rehabilitation, LLCGlenview, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Casey M. McMillan among 1,881 internal medicine physician records in South Carolina
Casey M. McMillan, MD is one of 1,881 internal medicine physician records with a practice address in South Carolina. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 42% of them.
- NPI issued2007 · 42% of these records are older, 53% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2004 · median 2006 among the 1,119 with a school on file
- Record last updated2025 · 46% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a South Carolina practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
269 internal medicine physician records list a practice address in Columbia
They are 269 of the 11,200 NPPES records with a practice address in Columbia, and 1,881 internal medicine physician records in South Carolina.
All 1,881 in South Carolina → Every provider in Columbia → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Gary Bell, M.D.Columbia, SC 292031689640922
- Anthony Elkins, MDColumbia, SC 292031629045505
- James Gasque, MDColumbia, SC 292031255326096
- Brown McCallum, M.D.Columbia, SC 292031124090352
- Kay McFarland, M.D.Columbia, SC 292031205803020
- Fanwei Meng, MDColumbia, SC 292031780650937
- H Murdaugh, M.D.Columbia, SC 292031083680946
- Mieke Perez, MDColumbia, SC 292031881670305
Common questions
What is Casey M. McMillan, MD's NPI number?
Casey M. McMillan, MD's National Provider Identifier (NPI) is 1861526790, issued on Mar 15, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Casey M. McMillan, MD located?
The NPPES record lists a practice address at 111 Doctor Cir, Columbia, SC, 29203. Phone: (800) 491-0909. Providers update this record themselves, so call before visiting.
How can I verify Casey M. McMillan, MD's license?
NPPES lists South Carolina license number 26958, 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 Casey M. McMillan, MD prescribe under Medicare Part D?
In 2024, Casey M. McMillan, MD had 746 Medicare Part D claims for 260 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Casey M. McMillan, MD's MIPS final score?
The 2023 MIPS final score is 87.8 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.