Robert Geoffrey Gellin, D.M.D., M.H.S.
Periodontics · Charleston, SC
Robert Geoffrey Gellin, D.M.D., M.H.S. is a periodontics with a practice address in Charleston, South Carolina, and NPI 1104989847, issued on Dec 17, 2006. Check the license (South Carolina 345, as entered in NPPES) with the South Carolina board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Robert Geoffrey Gellin
- Credential
- D.M.D., M.H.S.
- Primary taxonomy
- Periodontics 1223P0300X
- License numbers
- 345 SC
2797 SC
Self-reported in NPPES; status is on the state search - Practice location
- 173 Ashley Ave, Charleston, SC 29425
- Phone
- (843) 792-3444
- Enumerated
- Dec 17, 2006
- Record last updated
- Sep 11, 2025
- Fax
- (843) 792-0348
- Entity
- Type 1 · individual
8 nearest periodontics records → All 92 in South Carolina → Look up another NPI →
Also registered at 173 Ashley Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Joseph AssadEndodontics1225157837
- Merve BenliProsthodontics1689435174
- Ethan Berman, DMDGeneral Practice Dentistry1205573367
- Rachel Chen, DMDGeneral Practice Dentistry1013587443
- Hua Hong Chien, DDSPeriodontics1215339973
- Dallas Clark, DMDDentist1447942859
Verify Robert Geoffrey Gellin in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich South Carolina board licenses this profession
Search for license 345Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
59% fewer Medicare Part D claims than the average periodontics in 2024
114 Medicare Part D claims for 40 beneficiaries, against an average of 277 among the 4,191 providers of this specialty who prescribed in Part D. 11 claims were for opioids.
Most prescribed
- Chlorhexidine Gluconate37 claims
- Amoxicillin19 claims
- Hydrocodone-Acetaminophen11 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.
Industry payments in 2024: $19.71
1 payment: food and beverage; the largest payer was Dentsply Sirona Inc. The 2,966 providers of this specialty with any payment received $1,338.41 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.
Robert Geoffrey Gellin among 92 periodontics records in South Carolina
Robert Geoffrey Gellin, D.M.D., M.H.S. is one of 92 periodontics records with a practice address in South Carolina. 65% 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 8% of them.
- NPI issued2006 · 8% of these records are older, 58% newer
- In a Medicare fileYes · 65% of these records are
- In the CMS Doctors and Clinicians fileNo · 0% of these records are
- Record last updated2025 · 65% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 1223P0300X and a South Carolina practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Periodontics providers in South Carolina
There are 92 periodontics records in South Carolina.
All 92 in South Carolina → Every provider in Charleston → Periodontics nationwide →
The 8 periodontics records with the nearest ZIP codes
- Hua Hong Chien, DDSCharleston, SC 294251215339973
- Kara Grasso Veeder, D.M.D, M.S.D.Charleston, SC 294251407117385
- Tariq Javed, D.M.D.Charleston, SC 294251326177122
- Joe Krayer, D.D.S., M.S.Charleston, SC 294251669530994
- Renata Leite, MS, DDSCharleston, SC 294251629585880
- Mark McEntire, D.M.D.Charleston, SC 294251558595074
- William Ries, D.D.S.Charleston, SC 294251710087911
- John Sanders, D.D.S.Charleston, SC 294251770633943
Common questions
What is Robert Geoffrey Gellin, D.M.D., M.H.S.'s NPI number?
Robert Geoffrey Gellin, D.M.D., M.H.S.'s National Provider Identifier (NPI) is 1104989847, issued on Dec 17, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Robert Geoffrey Gellin, D.M.D., M.H.S. located?
The NPPES record lists a practice address at 173 Ashley Ave, Charleston, SC, 29425. Phone: (843) 792-3444. Providers update this record themselves, so call before visiting.
How can I verify Robert Geoffrey Gellin, D.M.D., M.H.S.'s license?
NPPES lists South Carolina license number 345, as entered by the provider. Search the South Carolina board that licenses this profession; the NPPES record confirms identity only.
How much does Robert Geoffrey Gellin, D.M.D., M.H.S. prescribe under Medicare Part D?
In 2024, Robert Geoffrey Gellin, D.M.D., M.H.S. had 114 Medicare Part D claims for 40 beneficiaries; the average among periodontics prescribers was 277. 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.