Marc Demyun, MD
Marc Demyun is an Internal Medicine specialist based in Greenville, TX with over 29 years of clinical experience. Medicare-enrolled per CMS records and offers virtual telehealth visits.
Also practices: FAMILY PRACTICE
Marc Demyun, MD has practiced internal medicine for 29+ years, working in group practice. He has been practicing since 2006 — over 29 years. CMS Medicare data shows his patients commonly have hypertension, high cholesterol, and ischemic_heart.
Older · 257dNPPES updated 2025-09-08 · verify NPI on CMS · Verify license at Texas Medical Board
Contact & Location
Practice Location
4001 Ridgecrest Rd Ste a, Greenville, TX 75402-6143
How Does This Doctor Compare?
Medicare Patients
66
Unique beneficiaries
Standard volumePrescription Recipients
25
Patients prescribed
Prescriptions Written
80
Total claims
Total Medicare drug cost: $3k
Data Note: Sourced from CMS Medicare Provider Utilization & Payment Data. Percentile rankings compare this provider against all peers with reported data in the same state. Updated annually to reflect the latest federal reporting cycle.
What This Doctor Treats Most
Based on Medicare claims data — here's what patients commonly see this doctor for
Based on Medicare data, this doctor primarily manages Hypertension, High Cholesterol, and Ischemic Heart Disease.
High blood pressure — a leading risk factor for heart disease and stroke
Elevated cholesterol or triglycerides that increase heart disease risk
Reduced blood flow to the heart muscle, commonly known as coronary artery disease
Chronic Obstructive Pulmonary Disease — a group of lung diseases that block airflow
Joint inflammation causing pain, swelling, and stiffness
The heart cannot pump blood efficiently enough to meet the body's needs
Excessive worry or fear that interferes with daily life
An irregular, often rapid heartbeat that increases the risk of stroke
Percentage of this provider's Medicare patients diagnosed with each condition. Source: CMS Utilization Data.
$157 received from industry
7 transactions reported in 2024 ·Low tier
Payments include consulting fees, speaking honoraria, food & beverage, travel, research support, and ownership interests from drug and medical device manufacturers. Disclosure is required by the federal Physician Payments Sunshine Act. These payments do not necessarily indicate conflicts of interest. National median: $338 across 136 000 tracked providers.
Tiers — Low: under $500 · Moderate: $500-5 000 · High: $5 000-25 000 · Very High: $25 000+. Source: CMS Open Payments 2024, attributed to Marc Demyun's NPI.
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Background & Specialty
Education, training, and specialty classification from CMS NPPES and Medicare records.
Board certified · Sep 7, 2025
Self-reported via NPPES
29 years in practice
Experienced
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Taxonomy: 207R00000X
Mailing address
2810 E Trinity Mills Rd Ste 130, Carrollton, TX 75006-2339
Differs from practice location
Virtual Internal Medicine Care With Marc Demyun
NPPES records indicate this provider offers telehealth services. Contact the office to confirm availability and scheduling.
Schedule a virtual visit with Marc Demyun for blood pressure monitoring, cholesterol management, follow-up consultations — no travel to Greenville required. The office sends a secure video link before your appointment. Most visits take 15–30 minutes. Medicare enrolled per CMS records.
Frequently Asked Questions
Common questions about Marc Demyun
NPI records show Dr. Demyun as active with telehealth listed in Greenville, TX. NPI status alone doesn't confirm open availability — call the office to confirm. Phone: (903) 453-2850.
Sourced from CMS NPPES · OIG LEIE · CMS Medicare Part D · CMS Open Payments 2024 · CMS Physician Comparator. See Data Methodology.
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Contact Marc Demyun
Practice Location
4001 Ridgecrest Rd Ste a, Greenville, TX 75402-6143
Mailing Address
2810 E Trinity Mills Rd Ste 130, Carrollton, TX 75006-2339
This is a provider directory. Contact the office directly to schedule appointments.
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