William McWilliams, MD
Internal Medicine Physician · Columbia, SC
William McWilliams, MD is an internal medicine physician with a practice address in Columbia, South Carolina, and NPI 1346535127, issued on Jun 9, 2011. Check the license (South Carolina 33545, as entered in NPPES) on the South Carolina Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- William McWilliams
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 33545 SC
LL33545 SC
Self-reported in NPPES; status is on the state search - Practice location
- 14 Richland Medical Park Dr, Columbia, SC 29203
- Phone
- (803) 434-6771
- Enumerated
- Jun 9, 2011
- Entity
- Type 1 · individual
Also registered at 14 Richland Medical Park Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Adila Abdul-Karim, FNP-CFamily Nurse Practitioner1245616598
- Curtis Bair, M.D.Internal Medicine Physician1306977806
- Jason Barber, M.D.Hospitalist Physician1598893257
- Joseph Barnaba, PHARM.DPharmacist1518561646
- Lawrence BeanAmbulatory Care Pharmacist1265105084
- Chelsea Benedict, MDPediatrics Physician1760233019
Verify William McWilliams in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersSouth Carolina Board of Medical Examiners
Search for license 33545Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
86% fewer Medicare Part D claims than the average internal medicine physician in 2024
401 Medicare Part D claims for 149 beneficiaries, against an average of 2,785 among the 127,794 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims. 23 claims were for opioids.
Most prescribed
- Atorvastatin Calcium35 claims
- Amlodipine Besylate19 claims
- Prednisone14 claims
- Losartan Potassium12 claims
- Pantoprazole Sodium12 claims
- Carvedilol11 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 Medicare quality score for 2023: 99.3 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).
One hospital or facility affiliation
- Prisma Health Medical Group-MidlandsColumbia, SC
Source: CMS Doctors and Clinicians affiliations; Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
359 internal medicine physician records list a Columbia practice address
They are 359 of the 11,200 NPPES records with a Columbia practice address, and 2,276 internal medicine physician records in South Carolina.
All 359 in Columbia → All 2,276 in South Carolina → Every provider in Columbia →
Other internal medicine physician records in South Carolina
- John Abbott, M.D.Sumter, SC1093830762
- Murad Abdelsalam, MDRock Hill, SC1013229756
- Mohammed Abdulfatah, MDOrangeburg, SC1285167023
- Amjad Abdulrahman, MDIrmo, SC1194718841
- Elizabeth Abell, MDSpartanburg, SC1083623805
- Alvin Abinsay, M.D.Marion, SC1689608002
- Izabela Abissi, DOCharleston, SC1376387803
- Tinu Abraham, MDGreenwood, SC1194354399
- Natallia Abramovich, MDSeneca, SC1568647949
- Mohammad Abudalou, MDColumbia, SC1164084653
Common questions
What is William McWilliams, MD's NPI number?
William McWilliams, MD's National Provider Identifier (NPI) is 1346535127, issued on Jun 9, 2011. An NPI identifies a provider in billing; it is not a license.
Where is William McWilliams, MD located?
The NPPES record lists a practice address at 14 Richland Medical Park Dr, Columbia, SC, 29203. Phone: (803) 434-6771. Providers update this record themselves, so call before visiting.
How can I verify William McWilliams, MD's license?
NPPES lists South Carolina license number 33545, 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 William McWilliams, MD prescribe under Medicare Part D?
In 2024, William McWilliams, MD had 401 Medicare Part D claims for 149 beneficiaries; the average among internal medicine physician prescribers was 2,785. Part D covers Medicare prescriptions only.
What is William McWilliams, MD's Medicare quality score?
The 2023 MIPS final score is 99.3 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 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.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.