C Gregory Martin, MD
Internal Medicine Physician · Johns Island, SC
C Gregory Martin, MD is an internal medicine physician with a practice address in Johns Island, South Carolina, and NPI 1023179504, issued on Dec 12, 2006. Check the license (South Carolina MD51916, as entered in NPPES) on the South Carolina Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- C Gregory Martin
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- MD51916 SC
45652 MA
Self-reported in NPPES; status is on the state search - Practice location
- 3226 Maybank Hwy, Johns Island, SC 29455
- Phone
- (843) 266-9800
- Enumerated
- Dec 12, 2006
- Record last updated
- Jun 11, 2024
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 1,881 in South Carolina → Look up another NPI →
Also registered at 3226 Maybank Hwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Nicolas Muzin, M.D.Family Medicine Physician1932420882
Verify C Gregory Martin in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersSouth Carolina Board of Medical Examiners
Search for license MD51916Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average internal medicine physician in 2024
24 Medicare Part D claims, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Doxycycline Hyclate11 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.
C Gregory Martin among 1,881 internal medicine physician records in South Carolina
C Gregory Martin, 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 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 58% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 60% of these records are
- Record last updated2024 · 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).
7 internal medicine physician records list a practice address in Johns Island
They are 7 of the 205 NPPES records with a practice address in Johns Island, and 1,881 internal medicine physician records in South Carolina.
All 1,881 in South Carolina → Every provider in Johns Island → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- George Book, MDJohns Island, SC 294551972127637
- Dominique Bultsma, MDJohns Island, SC 294551033733704
- James Byer, MDKiawah Island, SC 294551891930483
- Bernard Mansheim, MDJohns Island, SC 294551568820173
- Brittney Rodriguez, MDJohns Island, SC 294551083357792
- Margaret Roth, MDJohns Island, SC 294551740805449
- David Seignious, M.D.Johns Island, SC 294551891726287
- Michael Otruba, D.O.Ladson, SC 294561649255316
Common questions
What is C Gregory Martin, MD's NPI number?
C Gregory Martin, MD's National Provider Identifier (NPI) is 1023179504, issued on Dec 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is C Gregory Martin, MD located?
The NPPES record lists a practice address at 3226 Maybank Hwy, Johns Island, SC, 29455. Phone: (843) 266-9800. Providers update this record themselves, so call before visiting.
How can I verify C Gregory Martin, MD's license?
NPPES lists South Carolina license number MD51916, 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 C Gregory Martin, MD prescribe under Medicare Part D?
In 2024, C Gregory Martin, MD had 24 Medicare Part D claims; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
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.