Physicians

Christopher E. Adams, MD
Urology
Board-Certified: American Board of Urology
Residency: Urology, University of Iowa Hospitals and Clinics, Iowa City, IA
MD: Harvard Medical School, Boston, MA
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Abdi E. Ahari, MD
General Surgery
Board-Certified: American Board of Surgery
Fellow: American College of Surgeons
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Byron T. Beasley, MD
Cardiology
Dr. Byron T. Beasley is a board-certified physician with additional qualifications in Cardiovascular Disease and Geriatrics, practicing within the Mercy Heart Center of Mason City Clinic since 1979. He previously served as President of the Medical Staff and Director of Cardiovascular Services at Mercy Medical Center. Utilizing his extensive experience and advanced technical skills, Dr. Beasley also serves as a Clinical Assistant Professor at the University of Iowa Hospitals and Clinics.
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Erik Brink, DO, FACOS, FACS
General Surgery
BOARD CERTIFIED: General Surgery, American Osteopathic Board of Surgery
RESIDENCY: Lake Erie College of Osteopathic Medicine, Memorial Hospital, York, PA
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Samuel J. Congello, DO
Cardiovascular Disease
Board-Certified: Interventional Cardiology and Cardiovascular Disease, American Board of Internal Medicine
Fellow: American College of Cardiology, American College of Physicians, American College of Osteopathic Internists, Society for Cardiovascular Angiography and Interventions
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Michael W. Crane, MD
Orthopedic Surgery
Board-Certified: American Board of Orthopedic Surgery
Fellow: American Academy of Orthopedic Surgery, American Orthopedic Society
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Sandra Leticia Reis Crosara, MD
Infectious Diseases
Fellowship: Infectious Diseases, University of Nebraska Medical Cernter, Omaha, NE
MD: Universidade Federal de Minas Gerais, Brazil
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Sepideh Darbandi, DO
Cardiology
Board-Certified: Internal Medicine, American Board of Internal Medicine
Residency:Internal Medicine, MercyOne North Iowa, Mason City, IA
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Michael del Rio, MD
Cardiac and Thoracic Surgery
Board Certified: American Board of Thoracic Surgery, American Board of SurgeryGeneral Surgery Residency: Maimonides Medical Center, Brooklyn, NY
Cardiac Surgery Fellowship: Medical College of Virginia
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Timothy M. Dettmer, MD
ENT Otolaryngology
Advanced Training: Allergy
Board-Certified: American Board of Otolaryngology
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Henry R. Diggelmann, MD
Otolaryngology
Board-Certified: American Board of Otolaryngology
Residency: Otolaryngology – Head and Neck Surgery, University of Iowa Hospitals and Clinics, Iowa City, IA
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Scott M. Donohoe, DPM
Podiatry
Dr. Scott M. Donohoe is a highly skilled and experienced podiatrist practicing at Mason City Clinic since 2005. He is certified by the American Board of Foot and Ankle Surgery.
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Rene M. Duregger, MD
Psychiatry
Board-Certified: American Board of Psychiatry and Neurology, Psychiatry American Board of Psychiatry and Neurology, Child and Adolescent Psychiatry
Residency: Psychiatry, University of Kansas School of Medicine, Wichita, KS Child Psychiatry, University of Iowa School of Medicine, Iowa City, IA
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Matthew W. Fabian, DO
Bariatric Surgery
General Surgery Advanced Training: Bariatric Surgery & Gastroesophageal Reflux Disease
Board-Certified: General Surgery, American Board of Surgery
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Timothy A. Gibbons, MD
Orthopedic Surgery
Board-Certified: American Board of Orthopedic Surgery
Fellowship-Trained: Orthopedic Sports Medicine, University of Iowa, Iowa City, IA
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Gregory Grimberg, MD
Bariatric Surgery
Board Eligible: General Surgery, American Board of Surgery
Fellowship Trained: Bariatric Surgery Johns Hopkins University, Bayview Medical Center Baltimore, MD
Residency: Rutgers NJMS General Surgery Residency Newark, NJ
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Denisa L. Hagau, MD
Cardiovascular Disease
Board-Certified: Internal Medicine, Cardiovascular Disease, American Board of Internal Medicine, Echocardiography, Cardiovascular CT and Vascular Ultrasound
Residency: Internal Medicine, Memorial Hospital of Rhode Island, Pawtucket, RI
MD: University of Medicine and Pharmacy “Iuliu Hațieganu,” Romania
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Radu Hagau, MD
Cardiology
Board-Certified: Internal Medicine, Cardiovascular Disease, Echocardiography, Nuclear Cardiology, Vascular Ultrasound, Cardiovascular CT
Residency: Internal Medicine, Memorial Hospital of Rhode Island, Pawtucket, RI
MD: University of Medicine and Pharmacy “Iuliu Hațieganu,” Romania
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Daniel Hamilos, MD
Allergy and Immunology
Board-Certified: American Board of Internal Medicine, American Board of Allergy and Immunology
Residency: Duke University Medical Center, Durham, NC
MD: Northwestern University School of Medicine, Chicago, IL
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Edward S. Henrich, DPM
Podiatry
Board-Certified: American Board of Podiatric Surgery, American Board of Extremity Surgery
Fellow: American College of Foot and Ankle Surgeons
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Vishram Jalukar, MD
ENT Otolaryngology / Sleep Medicine
Fellowship-Trained: Otolaryngology – Head and Neck Surgery, University of Iowa, Department of Otolaryngology, Iowa City, IA
Residency: Otolaryngology, University of Iowa Hospitals and Clinics, Iowa City, IA
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Harsha U. Jayawardena, MD
General Surgery
Board-Certified: American Board of Surgery
Fellow: American College of Surgeons
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Darron M. Jones, MD
Orthopedic Surgery
Board-Certified: American Board of Orthopedic Surgery
Fellow: American Academy of Orthopedic Surgeons
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Ronald F. Kloc, MD
Interventional Pain Management
Board Certified: American Board of Anesthesiology with Special Qualification in Pain Management
Residency: Anesthesiology, Medical College of Ohio, Toledo OH
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Mark E. Lassise, MD
Psychiatry
Dr. Mark E. Lassise is board-certified in Psychiatry and Neurology, with additional qualifications in Addiction Medicine, and has treated patients at Mason City Clinic since 1997. With over 25 years of practice experience and extensive training, Dr. Lassise provides patients with state-of-the-art care for a wide range of conditions.
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Daniel J. Lee, MD
ENT Otolaryngology
Dr. Lee received his Medical Doctorate in May 2016 from the University of Iowa Carver College of Medicine in Iowa, and completed his residency in Otolaryngology at the University of Iowa – Hospital and Clinics.
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Phillip C. Lee, MD
Otolaryngology and Sleep Medicine
Board-Certified: Sleep Medicine, American Board of Otolaryngology
Residency: Otolaryngology, University of Iowa Hospitals and Clinics, Iowa City, IA
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Timothy L. Mulholland, MD
Urology
Board-Certified: American Board of Urology
Fellowship-Trained: Laparoscopy and Minimally Invasive Surgery, University of Oklahoma Health Sciences Center, Oklahoma City, OK
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Tyler M. Mulkey, DPM
Foot and Ankle Surgery
Dr. Mulkey received his Doctor of Podiatric Medicine in June of 2018 from Rosalind Franklin University in Chicago. He then went on to complete his residency at Christus St. Patrick Podiatric Medicine and Surgical Residency in Louisiana.
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Mark W. Mulkey, MD
Plastic, Hand and Reconstructive Surgery
Board-Certified: American Board of Surgery, American Board of Plastic Surgery
Fellow: American College of Surgeons
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Eric J. Potthoff, DO
Orthopedic Surgery
Board-Certified: American Osteopathic Academy of Orthopedics
Residency: Orthopedic Surgery, Doctors Hospital of Stark County, Massillon, OH
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Mihail Radulescu, MD
Board Certified: American Board of Orthopedic Surgery
Fellowship Trained: Adult Hip and Knee Reconstruction, William Beaumont Hospital, Royal Oak, MI
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Rogerio M. Ramos, MD
Psychiatry
Dr. Rogerio Ramos is a board-certified psychiatrist who has practiced in the mental health clinic at Mason City Clinic since 2009, as well as serving as Medical Director of Prairie Ridge Addiction Treatment Center and running a buprenorphine clinic for patients with addictions.
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Richard E. Rattay, MD
Orthopedic Surgery
Board-Certified: American Board of Orthopedic Surgery, Certificate of Added Qualification in Surgery of the Hand
Fellowship-Trained: Orthopedic Hand and Upper Extremity Surgery, University of Minnesota; Microvascular Surgery, Mayo Clinic, Rochester, MI
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Richard R. Rattin, DO
Cardiology
Board-Certified: Interventional Cardiology, Cardiology, Nuclear Cardiology, and Internal Medicine
Fellow: American College of Cardiology, Society for Cardiovascular Angiography & Intervention
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René F. Recinos, MD, PHD
Plastic, Hand and Reconstructive Surgery
Board-Certified: American Board of Plastic Surgery
Residency: Plastic Surgery, Medical College of Wisconsin, Milwaukee, WI
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Kevin R. Rier, MD
Urology
Board-Certified: American Board of Urology
Residency: Urology and Surgery, University of Oklahoma Health Sciences Center, Oklahoma City, OK
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Michael J. Sarik, DO
Cardiology
Fellow: American College of Cardiology
Fellowship-Trained: Cardiology, Thomas Jefferson University Hospital/Mercy Catholic Medical Center, Philadelphia, PA; Cardiac Electrophysiology, Deborah Heart and Lung Center, Browns Mills, NJ and Thomas Jefferson University Hospital, Philadelphia, PA
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Michael B. Scherb, MD
Orthopedic Surgery
Board-Certified: American Board of Orthopedic Surgery
Fellowship-Trained: Foot and Ankle Orthopedics, Union Memorial Hospital, Baltimore, MD
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Kathryn Schwalbe, DO
General Surgery
BOARD ELIGIBLE: General Surgery, American Board of Surgery
RESIDENCY: Cleveland Clinic- South Pointe Hospital, Cleveland, OH
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Fayez Siddiqui, MD
Interventional Cardiology
Board-Certified: Internal Medicine and Nuclear CardiologyFellowship-Trained: Interventional Cardiology, University of Cincinnati Medical Center, Cardiovascular Diseases, Wayne State University, Detroit Medical Center
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Satish K. Sondhi, MD
Gastroenterology
Board-Certified: Gastroenterology and Internal Medicine, American Board of Internal Medicine
Fellowship-Trained: Gastroenterology, University of Kentucky Medical Center, Lexington, KY
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Michael Spooner, MD
Cardiology
Board-Certified: Internal Medicine, American Board of Internal Medicine;
Cardiovascular Diseases, American Board of Internal Medicine
Clinical Cardiac Electrophysiology, American Board of Internal Medicine

Elizabeth Takacs, MD
Urology
Board-Certified: American Board of Urology, with a subspecialty recognition in Urogenital Reconstructive Pelvic Surgery
Fellowship: UT Texas Southwestern, Female Urology, Incontinence and Urodynamics
Residency: State University of NY, Buffalo, NY
MD: University of Iowa, Iowa City, IA
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Steven P. Thoma, MD
Urology
Board Certified: American Board of Urology
Residency: Urology, Louisiana State University – HSC, Shreveport, LA
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Trisha L. Thoma, MD
Otolaryngology
Board Certified: Otolaryngology, American Board of Otolaryngology
Residency: Otolaryngology – Head and Neck Surgery, Louisiana State University – HSC, Shreveport, LA
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Dr. Corey J. Thompson, MD
Psychiatry
Dr. Thompson received his undergraduate and graduate degrees from Western Michigan University in Kalamazoo, Michigan. He received his medical degree and completed his medical residency at University of Illinois at Chicago in Chicago, Illinois.
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Rajinder K. Verma, MD
Neurology Advanced Training: Sleep Medicine
Board-Certified: Neurology, American Board of Psychiatry and Neurology
Residency: Neurology, University of Kansas Medical Center, Kansas City, KS
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Kenneth Walsh, MD
Vascular Surgery
Board-Certified: Vascular Surgery, American Board of Surgery
Residency: New Jersey Medical School, Newark, NJ
MD: Temple University School of Medicine, Philadelphia, PA
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