John B. Calhoun, M.D.
Internal Medicine Physician · Charleston, SC
John B. Calhoun, M.D. is an internal medicine physician with a practice address in Charleston, South Carolina, and NPI 1770845141, issued on Jun 12, 2012. Check the license (South Carolina LL34731, as entered in NPPES) on the South Carolina Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- John B. Calhoun
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- LL34731 SC
Self-reported in NPPES; status is on the state search - Practice location
- 169 Ashley Ave, Charleston, SC 29425
- Phone
- (843) 792-4047
- Enumerated
- Jun 12, 2012
- Record last updated
- Jun 12, 2012 (not updated in 14 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20150805009428); accepts Medicare assignment
- Medical or professional school
- Medical College Of Georgia School Of Medicine, 2012
- 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 169 Ashley Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify John B. Calhoun in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersSouth Carolina Board of Medical Examiners
Search for license LL34731Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
5.2 times the Medicare Part D claims of the average internal medicine physician in 2024
16,467 Medicare Part D claims for 1,029 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 1,164 claims were for opioids.
Most prescribed
- Atorvastatin Calcium713 claims
- Amlodipine Besylate683 claims
- Gabapentin556 claims
- Tramadol Hcl520 claims
- Levothyroxine Sodium441 claims
- Pantoprazole Sodium410 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): 97.6 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).
Industry payments in 2024: $206.45
12 payments; by number, the most common kind was food and beverage; the largest payer was GlaxoSmithKline, LLC. The 50,334 providers of this specialty with any payment received $1,303.06 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
- Southern Clinic PCDothan, AL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John B. Calhoun among 1,881 internal medicine physician records in South Carolina
John B. Calhoun, M.D. 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 2012, is newer than 56% of them.
- NPI issued2012 · 56% of these records are older, 43% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2012 · median 2006 among the 1,119 with a school on file
- Record last updated2012 · 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).
427 internal medicine physician records list a practice address in Charleston
They are 427 of the 10,840 NPPES records with a practice address in Charleston, and 1,881 internal medicine physician records in South Carolina.
All 1,881 in South Carolina → Every provider in Charleston → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Sujeev Bains, MDCharleston, SC 294251609889989
- Elisha Brownfield, MDCharleston, SC 294251639287683
- Ernest Clyburn, MDCharleston, SC 294251235247271
- Kimberly Davis, MDCharleston, SC 294251366550311
- John Feussner, MDCharleston, SC 294251689782534
- Jennifer Goldstein, MDCharleston, SC 294251164472593
- Robert Ishak, M.D.Charleston, SC 294251295727790
- Brad Keith, MDCharleston, SC 294251578671442
Common questions
What is John B. Calhoun, M.D.'s NPI number?
John B. Calhoun, M.D.'s National Provider Identifier (NPI) is 1770845141, issued on Jun 12, 2012. An NPI identifies a provider in billing; it is not a license.
Where is John B. Calhoun, M.D. located?
The NPPES record lists a practice address at 169 Ashley Ave, Charleston, SC, 29425. Phone: (843) 792-4047. Providers update this record themselves, so call before visiting.
How can I verify John B. Calhoun, M.D.'s license?
NPPES lists South Carolina license number LL34731, 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 John B. Calhoun, M.D. prescribe under Medicare Part D?
In 2024, John B. Calhoun, M.D. had 16,467 Medicare Part D claims for 1,029 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is John B. Calhoun, M.D.'s MIPS final score?
The 2023 MIPS final score is 97.6 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.