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Hematology (Internal Medicine) in Saint Louis, Missouri

Data updated monthly · Last refresh September 2026

16 Hematology (Internal Medicine) providers practice in Saint Louis. Listings are drawn from federal public records and are not endorsements.

Hematology (Internal Medicine) providers in Saint Louis

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. Amber Afzal, MD

Saint Louis, MO · $25 in drug and device payments (2025) · (314) 362-7216

Dr. Amir Mahmoud, MD

Saint Louis, MO · No drug or device payments recorded (2025) · (314) 362-7216

Dr. Amy Zhou, MD

Saint Louis, MO · $2,636 in drug and device payments (2025) · Telehealth · (314) 362-7216

Dr. Andrew Young, MD

Saint Louis, MO · $333 in drug and device payments (2025) · (314) 362-7216

Dr. Douglas Tollefsen, MD

Saint Louis, MO · No drug or device payments recorded (2025) · (314) 362-8808

Dr. Elaine Majerus, MD

Saint Louis, MO · $19,846 in drug and device payments (2025) · (314) 362-7216

Dr. Gregory Longmore, MD

Saint Louis, MO · No drug or device payments recorded (2025) · (314) 747-1171

Dr. Helen Ajufo, MD

Saint Louis, MO · $93 in drug and device payments (2025) · Telehealth · (314) 362-7216

Dr. Joshua Siner, MD

Saint Louis, MO · $934 in drug and device payments (2025) · (314) 362-7216

Dr. Kristen Sanfilippo, MD

Saint Louis, MO · $200 in drug and device payments (2025) · Telehealth · (314) 362-7216

Dr. Morey Blinder, MD

Saint Louis, MO · $21,805 in drug and device payments (2025) · Telehealth · (314) 362-7216

Dr. Sana Saif Ur Rehman, MD

Saint Louis, MO · No drug or device payments recorded (2025) · (314) 362-7216

Dr. Scot Hickman, MD

Saint Louis, MO · No drug or device payments recorded (2025) · (314) 362-1700

Dr. Shaun Hanson, MD

Saint Louis, MO · $2,935 in drug and device payments (2025) · (314) 849-6066

Dr. Stephen Oh, MD

Saint Louis, MO · $34,444 in drug and device payments (2025) · (314) 362-7216

Dr. Vorachart Auethavekiat, MD

Saint Louis, MO · No drug or device payments recorded (2025) · (314) 362-7216

Common questions

How many Hematology (Internal Medicine) providers are in Saint Louis, Missouri?

There are 16 Hematology (Internal Medicine) providers with active NPI records practicing in Saint Louis, according to federal NPPES data refreshed monthly.

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 Saint Louis Hematology (Internal Medicine) across Missouri

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.