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Internal Medicine

Demetrius S. Maoury, MD

Works at hospitals in Warrenton, VA · Haymarket, VA · Virginia

Summary

Dr. Demetrius S. Maoury, MD is an internal medicine doctor at 419 Holiday Ct, Suite 100, Warrenton, VA 20186. Phone: (540) 347-4200. Accepts Medicare assignment. In 2024, Demetrius S. Maoury had 610 Original Medicare patients and 2,878 services. NPI 1619941796. Source: CMS National Downloadable File, updated October 2, 2026; CMS Facility Affiliation Data, updated October 2, 2026; CMS Medicare Physician & Other Practitioners, data year 2024.

  • Specialty: Internal medicine doctor (Medicare lists Internal Medicine)
  • Address: 419 Holiday Ct, Suite 100, Warrenton, VA 20186 · Directions
  • Phone: (540) 347‑4200
  • Medicare: Accepts Medicare assignment
  • Hospitals: Fauquier Hospital, UVA Health Haymarket Medical Center
  • Group practice: Fauquier Physician Practices LLC
  • Medical school: University Of Virginia School Of Medicine · graduated 1993 (33 years since medical school)
  • Gender (as listed): Male
  • Telehealth: offered

From official Medicare data

This page shows what Medicare's official clinician data says about Demetrius S. Maoury, joined by NPI number (data updated October 2, 2026). It is not a recommendation or a rating. Call the office or hospital to confirm before you go.

In a medical emergency, call 911.

Quick answers

Does Demetrius S. Maoury accept Medicare assignment?
Yes. Medicare's clinician data says Demetrius S. Maoury accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
How many Medicare patients does Demetrius S. Maoury see?
In 2024, CMS data shows 610 Original Medicare patients and 2,878 services for Demetrius S. Maoury. This counts Original Medicare only and measures volume, not quality.
What is Demetrius S. Maoury's NPI number?
1619941796. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.

Medicare activity in 2024

Official CMS public-use data for Demetrius S. Maoury, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.

Original Medicare patients610
Services billed to Medicare2,878
Different services or procedures36
Participating Medicare providerYes
Average age of these patients76

Most frequent services

  1. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)1,295 services
  2. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)464 services
  3. Injection of drug or substance under skin or into muscle (96372)169 services
  4. Injection, vitamin b-12 cyanocobalamin, up to 1000 mcg (J3420)159 services
  5. Administration of influenza virus vaccine (G0008)126 services

Chronic conditions among these patients

Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).

  • High blood pressure75%
  • High cholesterol75%
  • Arthritis37%
  • Diabetes32%
  • Ischemic heart disease24%
  • Atrial fibrillation21%

Hospitals where Demetrius S. Maoury works

Medicare's Facility Affiliation Data lists Demetrius S. Maoury at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.

  • Fauquier HospitalWarrenton, VA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 490023
  • UVA Health Haymarket Medical CenterHaymarket, VA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 490144

Practice locations

Addresses where Demetrius S. Maoury is enrolled with Medicare (CMS data updated October 2, 2026).

Group practices

Medicare enrollment lists Demetrius S. Maoury as a member of this group (CMS data updated October 2, 2026).

  • Fauquier Physician Practices LLC43 clinicians in the group

Specialties

Find other Internal Medicine doctors in Virginia →

Other internal medicine doctors in Warrenton

Clinicians with the same Medicare primary specialty in Warrenton, VA — not a recommendation.

All internal medicine doctors in Warrenton →

Other clinicians in Fauquier Physician Practices LLC

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

Clinician information

CredentialMD
Medical schoolUniversity Of Virginia School Of Medicine
Graduation year1993 (33 years since medical school)
Gender (as listed)Male
Medicare assignmentAccepts (Medicare-approved amount as full payment)
TelehealthOffers telehealth services
NPI (National Provider Identifier)1619941796
CorrectionsReport an error or suggest an update →

Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.

Sources

  1. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
  2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
  3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
  4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
  5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
  6. Medicare Care Compare — official Medicare tool to look up clinicians