Clinicians affiliated with Allen Hospital

Acute Care Hospitals · Voluntary non-profit - Private · 1825 Logan Avenue, Waterloo, IA 50703 · Waterloo-Cedar Falls, IA · CCN 160110

Affiliation snapshotNovember 2, 2026CMS Doctors and Clinicians Facility Affiliation file, current snapshot (no end-of-2024 archive), applied to 2024

Activity year2024Medicare Part B claims, Original Medicare fee-for-service

479 clinicians affiliated with Allen Hospital are in the 2024 Medicare Part B data (567 listed in the affiliation file).

Each clinician's exact figures are in their Physician Report, from their page. View sample report · Already purchased? Open your report (earlier Local report and passes)

Affiliated clinicians by specialty, 2024

All specialties · Nurse Practitioner (143) · Family Practice (54) · Anesthesiology (47) · Internal Medicine (28) · Physician Assistant (26) · Diagnostic Radiology (25) · Emergency Medicine (15) · Podiatry (11) · Orthopedic Surgery (10) · General Surgery (9) · Pathology (9) · Certified Registered Nurse Anesthetist (CRNA) (8) · Cardiology (7) · Gastroenterology (7) · Urology (7) · Hematology-Oncology (6) · Pulmonary Disease (6) · Clinical Cardiac Electrophysiology (5) · Neurology (5) · Psychiatry (5) · Interventional Cardiology (4) · Obstetrics & Gynecology (4) · Ophthalmology (4) · Otolaryngology (4) · Hospitalist (3) · Pain Management (3) · Physical Medicine and Rehabilitation (3) · Dermatology (2) · Endocrinology (2) · Infectious Disease (2) · Nephrology (2) · Neurosurgery (2) · Rheumatology (2) · Thoracic Surgery (2) · Certified Nurse Midwife (1) · Critical Care (Intensivists) (1) · Interventional Radiology (1) · Pediatric Medicine (1) · Plastic and Reconstructive Surgery (1) · Radiation Oncology (1) · Vascular Surgery (1)

Anesthesiology affiliated with Allen Hospital, 2024

Alphabetical by last name; 47.

Name	City
Donald J Anciaux	Des Moines, IA
Danae M Aplas, MD	Butte, MT
John A Becker, MD	Hiawatha, IA
Mark A Bennett, M.D.	Norristown, PA
Brian C Bowshier, M.D.	Des Moines, IA
Bick Carfrae, MD	Des Moines, IA
Christine R Carstensen, MD	Des Moines, IA
Brian T Cheney, M.D.	Hiawatha, IA
Rachel K Cogdill, MD	Hiawatha, IA
Meredith D Crenshaw, M.D.	Des Moines, IA
Jay R Diaz-Parlet, MD	Hiawatha, IA
Curt Feinberg, M.D.	Phoenix, AZ
Brent A Feller, MD	Hiawatha, IA
Michael Font	Des Moines, IA
Tyler Foster, D.O.	Des Moines, IA
Keeran Ghandivel, MD	Waterloo, IA
Matthew J Grady, M.D.	Waterloo, IA
Derrick Graulein	Hiawatha, IA
Ezra A Hallam, M.D.	Hiawatha, IA
Aaron S Hammond, DO	Roanoke, VA
Samuel Hartman, MD	Des Moines, IA
Nicholas Henry	Hiawatha, IA
Jamie H Johnson, M.D.	West Des Moines, IA
Matthew J Kidwell, M.D.	Hiawatha, IA
Jordan King, D.O., M.S.	Hiawatha, IA
Rodrigo Otavio Lami Pereira, MD	Waterloo, IA
Scott A Legrand, MD	Hiawatha, IA
Jessica D Lorenz, MD	Des Moines, IA
Uche P Maduka, MD	Hiawatha, IA
Timothy J Maiers, MD	Dubuque, IA
Joshua A Martini, MD	Coon Rapids, MN
Ginger R Massey, MD	Hiawatha, IA
Matthew R Okland, DO	Ames, IA
Kristy H Perrin, MD	Ames, IA
Joshua Priebe	Waterloo, IA
Bryan M Purdy, M.D.	Des Moines, IA
Justin R Rosenow, D.O.	Des Moines, IA
Brant Rustwick, MD	Hiawatha, IA
Adam L Shires, D.O.	Hiawatha, IA
Hans E Steine, MD	Hiawatha, IA
Sean M Sturm, DO	Ames, IA
John G Sweetman, M.D.	Iowa City, IA
Karl E Terwilliger, MD	Waterloo, IA
Sherif H Tewfik, MD	Ames, IA
Nicholas C Thompson, M.D.	West Des Moines, IA
Sara N Upmeyer, D.O.	Des Moines, IA
Dustin O Wiemers, MD	Des Moines, IA

Affiliation comes from the CMS Doctors and Clinicians Facility Affiliation file, hospital rows only; name, address and type from the CMS Hospital General Information file. CMS does not publish an end-of-year archive of the affiliation file, so the current snapshot is applied to the latest data year. A clinician listed with several hospitals or groups appears on each of their pages. How hospital pages are built