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Internal Medicine in Washington, Missouri

Data updated monthly · Last refresh September 2026

25 Internal Medicine providers practice in Washington, and 28% received drug or device company payments in 2025. Listings are drawn from federal public records and are not endorsements.

Internal Medicine providers in Washington

Listed alphabetically. Payment figures come from the federal Open Payments program, which requires drug and device companies to report what they pay physicians for consulting, speaking, meals, travel and royalties. A disclosed payment is a financial relationship, not evidence of wrongdoing, and many totals reflect a single meal. Figures cover calendar year 2025.

Dr. Anthony Kruse, M.D.
Washington, MO · No drug or device payments recorded (2025) · (636) 239-8231
Dr. Bryce Ayers, M.D.
Washington, MO · $151 in drug and device payments (2025) · Telehealth · (636) 239-7500
Dr. Changqing Zhao, M.D.
Washington, MO · No drug or device payments recorded (2025) · (636) 239-8231
Dr. Christin Wilkinson, MD
Washington, MO · No drug or device payments recorded (2025) · (636) 239-7500
Dr. Colleen Wingate, DO
Washington, MO · No drug or device payments recorded (2025) · (636) 239-8000
Dr. David Brunworth, MD
Washington, MO · No drug or device payments recorded (2025) · (636) 239-2741
Dr. Felix Nau Jr, MD
Washington, MO · No drug or device payments recorded (2025) · (636) 239-8231
Dr. Gary Dumontier, M.D.
Washington, MO · No drug or device payments recorded (2025) · (636) 239-7500
Dr. Jaya Parker, MD
Washington, MO · No drug or device payments recorded (2025) · (636) 239-8231
Dr. Kenneth Smith, M.D.
Washington, MO · $172 in drug and device payments (2025) · (636) 239-7500
Dr. Keyur Patel, M.D.
Washington, MO · No drug or device payments recorded (2025) · (636) 239-8231
Dr. Kirtana Viswanathan, MD, MPH
Washington, MO · No drug or device payments recorded (2025) · (636) 239-8231
Dr. Kyle Ostrom, M.D.
Washington, MO · $178 in drug and device payments (2025) · Telehealth · (636) 239-7500
Dr. Lauren Counts, M.D.
Washington, MO · No drug or device payments recorded (2025) · (636) 239-8231
Dr. Lydia Archuleta, M.D.
Washington, MO · No drug or device payments recorded (2025) · (636) 239-8000
Dr. Mandy Silver, MD
Washington, MO · No drug or device payments recorded (2025) · (817) 925-9233
Dr. Michael Rau, M.D.
Washington, MO · $17 in drug and device payments (2025) · (636) 239-7500
Dr. Rashid Qureshi, MD
Washington, MO · $125 in drug and device payments (2025) · (636) 239-8231
Dr. Robert Halsted, M.D.
Washington, MO · No drug or device payments recorded (2025) · (636) 239-7500
Dr. Sarah Dyson, MD
Washington, MO · No drug or device payments recorded (2025) · (636) 239-7500
Dr. Suraj Kumar Alakkassery Kumaran, MD
Washington, MO · No drug or device payments recorded (2025) · (636) 239-8231
Dr. Teresa Halsted, M.D.
Washington, MO · No drug or device payments recorded (2025) · (636) 239-7500
Dr. Thomas Farrell, M.D.
Washington, MO · No drug or device payments recorded (2025) · (636) 390-1777
Dr. Tim Baker, MD
Washington, MO · $47 in drug and device payments (2025) · (636) 239-2741
Dr. William Fritz, MD
Washington, MO · $32 in drug and device payments (2025) · (636) 390-2350

Conditions Internal Medicine providers in Washington, Missouri commonly treat

Patients often search by condition rather than specialty. These are conditions typically managed by Internal Medicine providers. Individual practices vary, so confirm with the provider before booking.

Common questions

How many Internal Medicine providers are in Washington, Missouri?

There are 25 Internal Medicine providers with active NPI records practicing in Washington, according to federal NPPES data refreshed monthly.

How many Internal Medicine providers in Washington received drug or device company payments?

7 of 25 (28%) received at least one payment from a drug or device company in 2025, according to the federal Open Payments program.

What conditions do Internal Medicine providers in Washington treat?

Internal Medicine providers in Washington commonly treat high blood pressure, type 2 diabetes, high cholesterol, preventive care, chronic disease management and related conditions. Individual practices vary, so confirm with the provider before booking.

Where does this data come from?

Provider records come from the federal NPPES registry and CMS Doctors and Clinicians files. Payment figures come from the CMS Open Payments program for calendar year 2025. The directory refreshes monthly.

All specialties in Washington Internal Medicine across Missouri

Try a city like Tucson, a zip like 85016, or a specialty like psychiatry. For a doctor by name, use the full search.
Sources: NPPES (CMS), Doctors and Clinicians national files, CMS Open Payments 2025. Updated monthly. Records are public federal data and are not verified credentials, licensure checks, or endorsements. This directory is informational and not medical advice. How we build this directory.