Ronald Johnson, M.D.
Internal Medicine Physician · Columbia, SC
Ronald Johnson, M.D. is an internal medicine physician with a practice address in Columbia, South Carolina, and NPI 1467487686, issued on Jul 12, 2006. Check the license (South Carolina 10556, as entered in NPPES) on the South Carolina Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Ronald Johnson
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 10556 SC
Self-reported in NPPES; status is on the state search - Practice location
- 4100 Main St, Columbia, SC 29203
- Phone
- (803) 786-0980
- Enumerated
- Jul 12, 2006
- Entity
- Type 1 · individual
Also registered at 4100 Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Elnora Christian, RNAdministrator Registered Nurse1538339866
- Burnett Gallman, M.D.Internal Medicine Physician1336162338
- Christopher Mims, P.T.Physical Therapist1225160088
- Gary Wright, PH.D.Clinical Psychologist1164667572
Verify Ronald Johnson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersSouth Carolina Board of Medical Examiners
Search for license 10556Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
88% fewer Medicare Part D claims than the average internal medicine physician in 2024
340 Medicare Part D claims, against an average of 2,785 among the 127,794 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims.
Most prescribed
- Labetalol Hcl52 claims
- Clopidogrel47 claims
- Levothyroxine Sodium43 claims
- Pravastatin Sodium43 claims
- Primidone43 claims
- Famotidine33 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.
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 Ronald Johnson, M.D.'s NPI number?
Ronald Johnson, M.D.'s National Provider Identifier (NPI) is 1467487686, issued on Jul 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ronald Johnson, M.D. located?
The NPPES record lists a practice address at 4100 Main St, Columbia, SC, 29203. Phone: (803) 786-0980. Providers update this record themselves, so call before visiting.
How can I verify Ronald Johnson, M.D.'s license?
NPPES lists South Carolina license number 10556, 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 Ronald Johnson, M.D. prescribe under Medicare Part D?
In 2024, Ronald Johnson, M.D. had 340 Medicare Part D claims; the average among internal medicine physician prescribers was 2,785. Part D covers Medicare prescriptions only.
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.