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DR. MARC DEMYUN MD
NPI 1952366684
Internal Medicine in Greenville, TX

Active since April 18, 2006PECOS EnrolledAccepts Medicare Assignment
4001 RIDGECREST RD STE A, GREENVILLE, TX 75402(903) 453-2850(903) 453-2859 Get Directions Write a Review

NPPES record last updated: September 8, 2025. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Sep 8, 2025, Jun 11, 2025, Nov 18, 2020 (3 updates tracked since 2020).

About Dr. Marc Demyun Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. MARC DEMYUN MD (NPI 1952366684) is an individual internal medicine provider in Greenville, Texas, licensed in Texas (P8236) and active in the NPI registry since April 2006. He is enrolled in Medicare PECOS, is affiliated with Texoma Medical Center, and maintains 2 additional practice locations.

NPPES Registry Identity

NPI1952366684
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. MARC DEMYUNCredential: MD
Location Address4001 RIDGECREST RD STE AGreenville, TX 75402-6143
Mailing Address2810 E Trinity Mills Rd Ste 130Carrollton, TX 75006-2339 · (972) 417-1936
Phone(903) 453-2850
Fax(903) 453-2859
Sole ProprietorNo
Medical School CMSOtherGraduated 1997
Enumeration DateApril 18, 2006
Last NPPES UpdateSeptember 8, 20253 updates tracked since enumeration
NPPES CertifiedSeptember 8, 2025
✔ NPI 1952366684 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
Licenses✔ Licensed in TX · P8236✔ Licensed in MS · 17980
Definition
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.
Also ListedFamily MedicineTaxonomy 207Q00000X · License P8236 (TX)

Secondary Practice Locations 2

Location 14215 Joe Ramsey Blvd EGreenville, TX 75401-7852 · Phone (903) 408-5000
Location 22810 E Trinity Mills Rd Ste 130Carrollton, TX 75006-2339 · Phone (972) 417-1936

Other Identifiers 1

OtherP8236TX · Texas License

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Marc Demyun Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID1254460942
PECOS Enrollment IDI20140206000150
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 4

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
201 services129 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
108 services67 patients
Hospital discharge day management, more than 30 minutes 99239
Hospital discharge day management over 30 minutes involves a detailed process to ensure a smooth transition from hospital to home. It includes final examinations, discussion of your hospital stay, post-discharge instructions, and coordinating follow-up care.
27 services27 patients
Hospital discharge day management, 30 minutes or less 99238
Hospital discharge day management of 30 minutes or less includes finalizing your treatment, discussing your progress, and planning after-care at home. It ensures you're ready to leave the hospital and continue recovery safely.
22 services22 patients

Hospital Affiliations CMS Care Compare 2

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Texoma Medical Center

Acute Care Hospitals · Denison, TX
3/5 CMS rating
OwnershipProprietary
CMS Certification Number450324
Location5016 S Us Highway 75Denison, TX 75020 · Grayson County
Emergency services Birthing friendly

Hunt Regional Medical Center

Acute Care Hospitals · Greenville, TX
3/5 CMS rating
OwnershipGovernment - Hospital District or Authority
CMS Certification Number450352
Location4215 Joe Ramsey Blvd EGreenville, TX 75401 · Hunt County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 75402 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$126.40 typical visit price
range $54.84 – $166.88
Typical copayment $31.60 (range $13.71 – $41.72)
Most-billed visit code 99204
Established Patient
$97.05 typical visit price
range $17.52 – $136.11
Typical copayment $24.26 (range $4.38 – $34.02)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

Reported Quality Measures

Care Plan
Percentage of patients aged 65 years and older who have an advance care plan or surrogate decision maker documented in the medical record that an advance care plan was discussed but the patient did not wish or was not able to name a surrogate decision maker…
97%115 patients4/55-star benchmark: 100%
Providers report different measures because they deliver different services; reporting more or less information is not a reflection of quality. Star ratings appear only where CMS assigned them.

Other Providers at the Same Location NPPES 5

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

HUNT MEMORIAL HOSPITAL DISTRICT
Clinic/Center (Rural Health)
4001 RIDGECREST RD STE A
GREENVILLE, TX 75402
Hunt County (903) 453-2850
DR. ASIM R USMAN MD
Internal Medicine
4001 RIDGECREST RD STE A
GREENVILLE, TX 75402
Hunt County (903) 453-2850
HEATHER DEANN WYATT FNP-C
Nurse Practitioner (Family)
4001 RIDGECREST RD STE A
GREENVILLE, TX 75402
Hunt County (903) 453-2850
HIREN D PATEL MD
Internal Medicine
4001 RIDGECREST RD STE A
GREENVILLE, TX 75402
Hunt County (903) 453-2850
MOHANAD BAKLEH MD
Internal Medicine
4001 RIDGECREST RD STE A
GREENVILLE, TX 75402
Hunt County (903) 453-2850

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Marc Demyun's NPI number?

The NPI number for Marc Demyun is 1952366684. It was assigned to this individual provider in the NPPES registry on April 18, 2006.

Where is Marc Demyun located?

Marc Demyun practices at 4001 Ridgecrest Rd Ste A, Greenville, TX 75402. The listed phone number is (903) 453-2850.

What is Marc Demyun's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Marc Demyun enrolled in Medicare?

Yes. Marc Demyun is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

What insurance does Marc Demyun accept?

Health plans from Ambetter Health, Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections and Ambetter from Superior HealthPlan and 6 other insurers list Marc Demyun as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Marc Demyun affiliated with any hospitals?

According to CMS data, Marc Demyun is affiliated with Texoma Medical Center and Hunt Regional Medical Center.

When was this NPI record last updated?

The NPPES record for Marc Demyun was last updated on September 8, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.