Internal Medicine in Mason City, Iowa
Data updated monthly · Last refresh September 2026
39 Internal Medicine providers practice in Mason City, and 36% received drug or device company payments in 2025. Listings are drawn from federal public records and are not endorsements.
Internal Medicine providers in Mason City
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. Adam Hoffmann, DOMason City, IA · $1,638 in drug and device payments (2025) ·
(641) 494-5300 Dr. Ali Mardan, PHD, MD, RPVI, FACPMason City, IA · No drug or device payments recorded (2025) ·
(641) 428-8001 Dr. Amy Tesar, DOMason City, IA · No drug or device payments recorded (2025) ·
(641) 428-6999 Dr. Bruce Harlan, MDMason City, IA · No drug or device payments recorded (2025) ·
(641) 422-6999 Dr. Burt Humburg, MDMason City, IA · No drug or device payments recorded (2025) ·
(641) 428-7000 Dr. Daniel Pennington, MDMason City, IA · No drug or device payments recorded (2025) ·
(641) 422-6999 Dr. David Popp, MDMason City, IA · No drug or device payments recorded (2025) ·
(641) 428-6999 Dr. Dejan Spaseski, MDMason City, IA · No drug or device payments recorded (2025) ·
(641) 428-7000 Dr. Dominick Myers, MDMason City, IA · No drug or device payments recorded (2025) ·
(641) 428-7000 Dr. Etee Patel, MDMason City, IA · $151 in drug and device payments (2025) ·
(641) 428-7000 Dr. Evelyn IngaMason City, IA · $209 in drug and device payments (2025) ·
(641) 428-6000 Dr. Fnu Dayawa Da Agoons, MDMason City, IA · No drug or device payments recorded (2025) ·
(641) 428-6615 Dr. Hersi MoallinMason City, IA · No drug or device payments recorded (2025) ·
(641) 428-6000 Dr. Jacob Obholz, DOMason City, IA · $80 in drug and device payments (2025) ·
(641) 428-5700 Dr. Jake Mullenbach, DOMason City, IA · No drug or device payments recorded (2025) ·
(641) 428-6000 Dr. Janice Kirsch, MDMason City, IA · No drug or device payments recorded (2025) · Telehealth ·
(641) 422-6000 Dr. Jashan Gill, MDMason City, IA · $1,351 in drug and device payments (2025) ·
(641) 494-5300 Dr. J.d. Thoreson, M.D.Mason City, IA · No drug or device payments recorded (2025) ·
(641) 494-5350 Dr. John Pflugi, DOMason City, IA · No drug or device payments recorded (2025) ·
(641) 428-6900 Dr. Jose Morales Oliva, MDMason City, IA · No drug or device payments recorded (2025) ·
(641) 428-5700 Dr. Luke Carlson, MDMason City, IA · $38 in drug and device payments (2025) ·
(641) 428-5700 Dr. Mark Johnson, MDMason City, IA · $28,199 in drug and device payments (2025) ·
(641) 428-7799 Dr. Mary Zahnle, MDIMason City, IA · $62 in drug and device payments (2025) ·
(641) 428-5700 Dr. Matthew Hardee, D.O.Mason City, IA · $21 in drug and device payments (2025) ·
(641) 428-5700 Dr. Melissa Frame, MDMason City, IA · No drug or device payments recorded (2025) ·
(641) 428-6000 Dr. Muhammad Tahir, M.D.Mason City, IA · $1,032 in drug and device payments (2025) ·
(641) 494-5300 Dr. Neena Singh, M.D.Mason City, IA · No drug or device payments recorded (2025) ·
(641) 428-7951 Dr. Nithin Karnan, MDMason City, IA · No drug or device payments recorded (2025) ·
(641) 428-5700 Dr. Patrick Dunlay, DOMason City, IA · No drug or device payments recorded (2025) ·
(641) 422-6999 Dr. Phillip Alscher, MDMason City, IA · No drug or device payments recorded (2025) ·
(641) 422-6999 Dr. Pratha Shettigar, MDMason City, IA · $79 in drug and device payments (2025) ·
(641) 428-5700 Dr. Richard Trimble, MDMason City, IA · No drug or device payments recorded (2025) ·
(641) 422-6999 Dr. Smitha Kanak, MDMason City, IA · No drug or device payments recorded (2025) ·
(641) 494-3000 Dr. Tanvi Deshpande, MDMason City, IA · $64 in drug and device payments (2025) ·
(641) 428-5700 Dr. Umer Mukhtar, MDMason City, IA · No drug or device payments recorded (2025) · Telehealth ·
(641) 428-6615 Dr. Vaughan Cipperly, MDMason City, IA · $278 in drug and device payments (2025) ·
(641) 428-6300 Dr. William Riesen, MDMason City, IA · No drug or device payments recorded (2025) ·
(641) 428-5700 Dr. Yuvaraj Thangaraj, MDMason City, IA · No drug or device payments recorded (2025) ·
(641) 428-6999 Dr. Zachary Fuller, DOMason City, IA · $5 in drug and device payments (2025) ·
(641) 428-5700 Conditions Internal Medicine providers in Mason City, Iowa 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.
- High blood pressure
- Type 2 diabetes
- High cholesterol
- Preventive care
- Chronic disease management
Common questions
How many Internal Medicine providers are in Mason City, Iowa?There are 39 Internal Medicine providers with active NPI records practicing in Mason City, according to federal NPPES data refreshed monthly.
How many Internal Medicine providers in Mason City received drug or device company payments?14 of 39 (36%) 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 Mason City treat?Internal Medicine providers in Mason City 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 Mason City Internal Medicine across Iowa