Marc Demyun, MD
Internal Medicine Physician · Greenville, TX
Marc Demyun, MD is an internal medicine physician with a practice address in Greenville, Texas, and NPI 1952366684, issued on Apr 18, 2006. Check the license (Texas P8236, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- Marc Demyun
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- P8236 TX
17980 MS
Self-reported in NPPES; status is on the state search - Practice location
- 4001 Ridgecrest RD Ste A, Greenville, TX 75402
- Phone
- (903) 453-2850
- Enumerated
- Apr 18, 2006
- Entity
- Type 1 · individual
Also registered at 4001 Ridgecrest RD Ste A
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Mohanad Bakleh, MDInternal Medicine Physician1942281415
- Hiren Patel, MDHospitalist Physician1891731865
- Asim Usman, MDInternal Medicine Physician1245256635
- Heather Wyatt, FNP-CFamily Medicine Physician1447975784
Verify Marc Demyun in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license P8236Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
85% fewer Medicare Part D claims than the average internal medicine physician in 2024
407 Medicare Part D claims for 90 beneficiaries, against an average of 2,785 among the 127,794 providers of this specialty who prescribed in Part D. 13 claims were for opioids.
Most prescribed
- Levothyroxine Sodium18 claims
- Atorvastatin Calcium17 claims
- Montelukast Sodium14 claims
- Amlodipine Besylate13 claims
- Donepezil Hcl13 claims
- Doxycycline Hyclate13 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: $156.53
7 payments, mostly food and beverage; the largest payer was Pfizer Inc.. The 65,274 providers of this specialty with any payment received $2,536.66 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.
3 hospital and facility affiliations
- Hospitalist Medicine Physicians OF Texas - Burnet PLLCDenison, TX
- Hunt Memorial Hospital DistrictGreenville, TX
- Texas Health And Therapy CentersFort Worth, TX
Source: CMS Doctors and Clinicians affiliations; Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
32 internal medicine physician records list a Greenville practice address
They are 32 of the 586 NPPES records with a Greenville practice address, and 11,069 internal medicine physician records in Texas.
All 32 in Greenville → All 11,069 in Texas → Every provider in Greenville →
Other internal medicine physician records in Texas
- Muhammad A. Sattar, MDDallas, TX1760465553
- Gayatri Aaluri, MDGalveston, TX1821928508
- Anunaya AashishDenton, TX1134246374
- Queenie Ann Abad, M.D.San Antonio, TX1174979785
- Fuad Abaleka, M.DLubbock, TX1861925596
- Carol Abalihi, M.D.El Paso, TX1326136243
- Pedro Abanto, M.D.McAllen, TX1982840393
- Oliverio Abarca Guzman, MDHarlingen, TX1346972940
- Obinna Abaribe, M.DMansfield, TX1457704355
- Enyinnaya Abarikwu, MDTyler, TX1174788178
Common questions
What is Marc Demyun, MD's NPI number?
Marc Demyun, MD's National Provider Identifier (NPI) is 1952366684, issued on Apr 18, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Marc Demyun, MD located?
The NPPES record lists a practice address at 4001 Ridgecrest RD Ste A, Greenville, TX, 75402. Phone: (903) 453-2850. Providers update this record themselves, so call before visiting.
How can I verify Marc Demyun, MD's license?
NPPES lists Texas license number P8236, as entered by the provider. Search the Texas Medical Board at https://profile.tmb.state.tx.us/Search.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Marc Demyun, MD prescribe under Medicare Part D?
In 2024, Marc Demyun, MD had 407 Medicare Part D claims for 90 beneficiaries; 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.