Marc Demyun, MD
NPI 1952366684 · Internal Medicine Physician · Greenville, TX
Enrolled with Medicare as Practitioner - General Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marc Demyun, MD is a Internal Medicine Physician provider in Greenville, TX (NPI 1952366684).
Provider details
- NPI number
- 1952366684
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- P8236 (TX)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
358 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 201 | $75 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 108 | $113 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 27 | $109 |
| Hospital Discharge Day Management, 30 Minutes Or Less99238 | 22 | $77 |
Typical Medicare-allowed amounts for these services range $75–$113 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 18 | — |
| Atorvastatin Calcium | 17 | — |
| Montelukast Sodium | 14 | — |
| Donepezil Hcl | 13 | — |
| Amlodipine Besylate | 13 | — |
| Doxycycline Hyclate | 13 | 12 |
| Pantoprazole Sodium | 12 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$157 across 7 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (2)
- 2810 E Trinity Mills Rd Ste 130Carrollton, TX 75006-2339Phone: (972) 417-1936
- 4215 Joe Ramsey Blvd EGreenville, TX 75401-7852Phone: (903) 408-5000
Registry dates
- Enumerated
- 2006-04-18
- Last updated
- 2025-09-08
- Certified
- 2025-09-08
Frequently asked questions
- What is Marc Demyun's NPI number?
- Marc Demyun's National Provider Identifier (NPI) is 1952366684, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marc Demyun's specialty?
- Marc Demyun is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Marc Demyun located?
- Marc Demyun's practice location on file with NPPES is 4001 Ridgecrest Rd Ste a, Greenville, TX 75402-6143.
- What is Marc Demyun's phone number?
- The practice phone number listed in the NPPES registry for Marc Demyun is (903) 453-2850.
- Does Marc Demyun accept Medicare?
- Marc Demyun is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marc Demyun's NPI active?
- Yes — Marc Demyun's NPI (1952366684) is active in the NPPES registry as of the last update on 2025-09-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.