Overview
Dr. Ryer is a board-certified and fellowship-trained vascular surgeon. His clinical interests include management of thoracic and abdominal aneurysms, carotid stenting and endarterectomy, stenting of the lower extremities and venous disease management. Dr. Ryer earned his medical degree from Temple University. He completed his residency at NewYork-Presbyterian Hospital/Weill Cornell Medical Center, and his fellowship in vascular surgery at Mayo Clinic, Rochester. Dr. Ryer is certified by the American Board of Surgery in surgery and vascular surgery.
Dr. Ryer is rated as an Experienced provider by MediFind in the treatment of Fibromuscular Dysplasia (FMD). His top areas of expertise are Abdominal Aortic Aneurysm (AAA), Thoracic Aortic Aneurysm, Peripheral Artery Disease, Aneurysm Repair, and Stent Placement.
His clinical research consists of co-authoring 54 peer reviewed articles. MediFind looks at clinical research from the past 15 years.
Insurance
Accepted insurance can change. Please verify directly with the provider.
Accepted insurance plans:
- EPO
- HMO
- POS
- PPO
- INSURANCE PLAN
- MANAGED MEDICAID PLAN
- MEDICARE MAPD
- OTHER MEDICARE PART D
- PPO
- EPO
- HMO
- PPO
- HMO
- POS
- PPO
- EPO
- HMO
- PPO
- OTHER MEDICAID
- STATE MEDICAID
- INSURANCE PLAN
- MANAGED MEDICAID PLAN
- MEDICARE MAPD
- MEDICARE PDP
- MEDICARE SNP
- MEDICARE-MEDICAID PLAN
- OTHER MEDICARE PART D
- EPO
- PPO
- HMO
- MANAGED MEDICAID PLAN
- EPO
- HMO
- POS
- PPO
- EPO
- PPO
Locations
100 North Academy Avenue, Danville, PA 17822
255 Route 220 Highway, Muncy, PA 17756
400 Highland Avenue, Lewistown, PA 17044
131 Jpm Road, Lewisburg, PA 17837
Clinical Research
Clinical research consists of overseeing clinical studies of patients undergoing new treatments and therapies, and publishing articles in peer reviewed medical journals. Providers who actively participate in clinical research are generally at the forefront of the fields and aware of the most up-to-date advances in treatments for their patients.
Geisinger Medical Center - Vascular Surgery
Dr. Garvin is a board-certified and fellowship-trained vascular surgeon. His clinical and research interests include carotid artery disease, aortic aneurysmal disease and peripheral artery disease. He has extensive experience with carotid stenting, carotid surgery, aortic stenting and aortic surgery, and stenting and surgery of arteries in the lower extremities. He also provides vascular access for dialysis patients. Dr. Garvin earned his medical degree from Temple University. He completed his residency at Western Pennsylvania Hospital, and a fellowship in vascular surgery at the Milton S. Hershey Medical Center. Dr. Garvin is certified by the American Board of Surgery in surgery and vascular surgery. Dr. Garvin is rated as a Distinguished provider by MediFind in the treatment of Fibromuscular Dysplasia (FMD). His top areas of expertise are Abdominal Aortic Aneurysm (AAA), Thoracic Aortic Aneurysm, Peripheral Artery Disease, Aneurysm Repair, and Carotid Artery Surgery.
The Milton S Hershey Medical Center Physicians Group
John Radtka is a Vascular Surgeon in Hershey, Pennsylvania. Dr. Radtka is rated as a Distinguished provider by MediFind in the treatment of Fibromuscular Dysplasia (FMD). His top areas of expertise are Abdominal Aortic Aneurysm (AAA), Thoracic Aortic Aneurysm, Carotid Artery Disease, Arterial Insufficiency, and Carotid Artery Surgery. Dr. Radtka is currently accepting new patients.
Geisinger Wyoming Valley Medical Office Building - Vascular Surgery
About Christopher Alexander DeMaioribus. Dr. Demaioribus is rated as a Distinguished provider by MediFind in the treatment of Fibromuscular Dysplasia (FMD). His top areas of expertise are Arterial Insufficiency, Peripheral Artery Disease, Carotid Artery Disease, Thoracic Aortic Aneurysm, and Carotid Artery Surgery.
Areas of Expertise
MediFind evaluates expertise by pulling from factors such as number of articles a doctor has published in medical journals, participation in clinical trials, speaking at industry conferences, prescribing and referral patterns, and strength of connections with other experts in their field.
Learn more about MediFind’s expert tiers
- Elite
- Abdominal Aortic Aneurysm (AAA)
- Thoracic Aortic Aneurysm
- Distinguished
- Arterial EmbolismDr. Ryer isDistinguished. Learn about Arterial Embolism.
- Arterial InsufficiencyDr. Ryer isDistinguished. Learn about Arterial Insufficiency.
- Carotid Artery DiseaseDr. Ryer isDistinguished. Learn about Carotid Artery Disease.
- Mesenteric Artery IschemiaDr. Ryer isDistinguished. Learn about Mesenteric Artery Ischemia.
- Peripheral Artery DiseaseDr. Ryer isDistinguished. Learn about Peripheral Artery Disease.
- Superior Mesenteric Artery Syndrome (SMAS)
- Advanced
- Aneurysm RepairDr. Ryer isAdvanced. Learn about Aneurysm Repair.
- Aortic DissectionDr. Ryer isAdvanced. Learn about Aortic Dissection.
- Arterial Tortuosity SyndromeDr. Ryer isAdvanced. Learn about Arterial Tortuosity Syndrome.
- Cystic Medial Necrosis of Aorta
- End-Stage Renal Disease (ESRD)
- Idiopathic EdemaDr. Ryer isAdvanced. Learn about Idiopathic Edema.
- Experienced
- AngioplastyDr. Ryer isExperienced. Learn about Angioplasty.
- CalciphylaxisDr. Ryer isExperienced. Learn about Calciphylaxis.
- Carotid Artery SurgeryDr. Ryer isExperienced. Learn about Carotid Artery Surgery.
- Deep Vein ThrombosisDr. Ryer isExperienced. Learn about Deep Vein Thrombosis.
- Degos DiseaseDr. Ryer isExperienced. Learn about Degos Disease.
- Fibromuscular Dysplasia (FMD)Dr. Ryer isExperienced. Learn about Fibromuscular Dysplasia (FMD).