Long Huynh-Duc, D.O.
Rheumatology Physician · Greenville, SC
Long Huynh-Duc, D.O. is a rheumatology physician with a practice address in Greenville, South Carolina, and NPI 1447572169, issued on Feb 22, 2010. Check the license (South Carolina 37758, as entered in NPPES) on the South Carolina Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Long Huynh-Duc
- Credential
- D.O.
- Primary taxonomy
- Rheumatology Physician 207RR0500X
- License number
- 37758 SC
Self-reported in NPPES; status is on the state search - Practice location
- 50 International Dr Ste 325, Greenville, SC 29615
- Phone
- (864) 235-8396
- Enumerated
- Feb 22, 2010
- Record last updated
- Jul 31, 2026
- Fax
- (864) 271-4092
- Medicare enrollment
- Enrolled (PECOS I20160202000708); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest rheumatology physician records → All 128 in South Carolina → Look up another NPI →
Also registered at 50 International Dr Ste 325
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Corey Ephrussi, DORheumatology Physician1487883443
- Suhail Kumar, MDRheumatology Physician1114104999
- Jocelyn Thompson, PAPhysician Assistant1235853987
Verify Long Huynh-Duc in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersSouth Carolina Board of Medical Examiners
Search for license 37758Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.4 times the Medicare Part D claims of the average rheumatology physician in 2024
4,724 Medicare Part D claims for 728 beneficiaries, against an average of 1,978 among the 6,301 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims. 465 claims were for opioids.
Most prescribed
- Prednisone722 claims
- Hydroxychloroquine Sulfate717 claims
- Methotrexate512 claims
- Tramadol Hcl247 claims
- Hydrocodone-Acetaminophen174 claims
- Diclofenac Sodium173 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.
No measured MIPS final score for 2023
CMS assigned the neutral MIPS final score of 75 without scoring Quality, Cost, Promoting Interoperability or Improvement Activities. It is an administrative threshold, so PlainDoctor does not compare it with measured clinicians.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $6,309.64
189 payments; by number, the most common kind was food and beverage; the largest payer was Amgen Inc. The 4,486 providers of this specialty with any payment received $8,538.33 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
- Piedmont Arthritis Clinic PAGreenville, SC
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Long Huynh-Duc among 128 rheumatology physician records in South Carolina
Long Huynh-Duc, D.O. is one of 128 rheumatology physician records with a practice address in South Carolina. 88% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 63% of them.
- NPI issued2010 · 63% of these records are older, 36% newer
- In a Medicare fileYes · 88% of these records are
- In the CMS Doctors and Clinicians fileYes · 71% of these records are
- Graduated2010 · median 2008 among the 90 with a school on file
- Record last updated2026 · 48% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RR0500X and a South Carolina practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Rheumatology Physician providers in South Carolina
There are 128 rheumatology physician records in South Carolina.
All 128 in South Carolina → Every provider in Greenville → Rheumatology Physician nationwide →
The 8 rheumatology physician records with the nearest ZIP codes
- Corey Ephrussi, DOGreenville, SC 296151487883443
- Irum Idrees, M.DGreenville, SC 296151568786630
- Suhail Kumar, MDGreenville, SC 296151114104999
- Muthamma Machimada, MDGreenville, SC 296151699725986
- Deborah Meadows, MDGreenville, SC 296151235105883
- Gulzar Merchant, M.D.Greenville, SC 296151811944754
- Letty Probasco, MDGreenville, SC 296151144844077
- Alan Brown, MDGreenville, SC 296111760590624
Common questions
What is Long Huynh-Duc, D.O.'s NPI number?
Long Huynh-Duc, D.O.'s National Provider Identifier (NPI) is 1447572169, issued on Feb 22, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Long Huynh-Duc, D.O. located?
The NPPES record lists a practice address at 50 International Dr Ste 325, Greenville, SC, 29615. Phone: (864) 235-8396. Providers update this record themselves, so call before visiting.
How can I verify Long Huynh-Duc, D.O.'s license?
NPPES lists South Carolina license number 37758, 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 Long Huynh-Duc, D.O. prescribe under Medicare Part D?
In 2024, Long Huynh-Duc, D.O. had 4,724 Medicare Part D claims for 728 beneficiaries; the average among rheumatology physician prescribers was 1,978. Part D covers Medicare prescriptions only.
What is Long Huynh-Duc, D.O.'s MIPS final score?
CMS assigned the neutral MIPS final score of 75 for 2023 without scoring any category, so it is not a measured result.
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.