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Alexander Coon, M.D.

Alexander Lewis Coon, M.D.

Photo of Dr. Alexander Coon, M.D.

Director of Endovascular Neurosurgery

Assistant Professor of Neurosurgery


Expertise: Acute Stroke Care, Aneurysms, Arteriovenous Malformations (AVM), Carotid Artery Stenosis, Cavernous Malformations, Cerebral Aneurysms, Dural Arteriovenous Fistulas, Epilepsy, Hydrocephalus, Intracerebral Hemorrhage , Moyamoya Disease, Neurosurgery, Spinal Disorders, Stroke, Subarachnoid Hemorrhage more

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The Johns Hopkins Hospital (Main Entrance)
Appointment Phone: 410-955-2438

1800 Orleans St.
Baltimore, MD 21287 map
Phone: 410-955-2438
Fax: 443-287-0338

Johns Hopkins Bayview Medical Center
Appointment Phone: 410-955-2438

4940 Eastern Avenue
Baltimore, MD 21224 map

Contact for Research Inquiries

Johns Hopkins Hospital Neurosurgery
1800 Orleans Street
Zayed 6115
Baltimore, MD 21287 map


Dr. Alexander Coon serves as the Director of Endovascular Neurosurgery for The Johns Hopkins Hospital. He is one of the world leaders in the endovascular treatment of cerebral aneurysms. Most known for his expertise in the use of innovative flow-diverting stents and intra-saccular flow disrupters for treatment of cerebral aneurysms, Dr. Coon has personally performed 700+ cases of endovascular flow diversion. He has mentored other physicians in the use of this technology across the United States and around the world. He has published extensively on the techniques and outcomes associated with flow-diversion use for cerebral aneurysms. He has actively participated in numerous ongoing multi-center clinical trials for flow-diverting stent technology.

In addition to cerebral aneurysm surgery, his practice involves the surgical and endovascular treatment of arteriovenous malformations (AVMs), cavernous malformations, and dural arteriovenous fistulas (dAVFs) of the brain and spinal cord. Dr. Coon utilizes the latest surgical and endovascular techniques to treat patients with carotid artery stenosis, acute stroke, intracerberal hemorrhage (ICH), subarachnoid hemorrhage (SAH), and moyamoya disease. He also focuses on the specialized treatment of spinal disorders, neurological trauma, and hydrocephalus.

Dr. Alexander Coon currently sees patients at the Johns Hopkins Hospital Outpatient Center (JHOC) on Mondays or by alternate appointment in his office. more


  • Director of Endovascular Neurosurgery
  • Director of Endovascular Neurosurgery Fellowship Program
  • Assistant Professor of Neurosurgery
  • Assistant Professor of Neurology
  • Assistant Professor of Radiology and Radiological Science

Departments / Divisions

Centers & Institutes



  • MD, Columbia University College of Physicians and Surg (2003)


  • Johns Hopkins University School of Medicine / Neurosurgery (2010)

Board Certifications

  • American Board of Neurological Surgery / Neurosurgery (2014)

Research & Publications

Research Summary

Dr. Coon's research interests are in the development of endovascular devices and the techniques and outcomes associated with their usage for cerebrovascular pathology. He has published extensively in the field of aneurysm treatment, stroke, and subarachnoid hemorrhage (SAH).

Clinical Trials

  • The Codman Enterprise Vascular Reconstruction Device and Delivery System (BARREL), 2007-present
  • The Surpass IntraCranial Aneurysm Embolization System Pivotal Trial to treat large or giant wide neck aneurysms (The SCENT Trial), 2013-present
  • Prospective study on embolization of intracranial aneurysms with Pipeline Embolization Device (PREMIER), 2015–present
  • Pivotal Study of the MicroVention Flow Re-Direction Endoluminal Device (FRED) Stent System in the Treatment of Intracranial Aneurysms, 2013-present
  • The WEB Intrasaccular Therapy Study (WEB-IT), 2014-present
  • Low-profile Visualized Intraluminal Support (LVIS and LVIS Jr.) Devices for the treatment of unruptured, wide necked, intracranial aneurysms. 2015-present
  • Aneurysm Treatment Using Intrasaccular Flow Diversion with the Artisse Device, 2016-present

Selected Publications

View all on Pubmed

Colby GP, Bender MT, Lin LM, Beaty N, Huang J, Tamargo RJ, Coon AL. Endovascular flow diversion for treatment of anterior communicating artery region cerebral aneurysms: a single-center cohort of 50 cases. J Neurointerv Surg. 2017 Jul;9(7):679-685. doi: 10.1136/neurintsurg-2016-012946. Epub 2017 Jan 27

Colby GP, Lin LM, Caplan JM, Jiang B, Michniewicz B, Huang J, Tamargo RJ, Coon AL. Flow diversion of large internal carotid artery aneurysms with the surpass device: impressions and technical nuance from the initial North American experience. J Neurointerv Surg. 2016 Mar;8(3):279-86. doi: 10.1136/neurintsurg-2015-011769. Epub 2015 May 18

Lin LM, Colby GP, Kim JE, Huang J, Tamargo RJ, Coon AL. Immediate and follow-up results for 44 consecutive cases of small (<10 mm) internal carotid artery aneurysms treated with the pipeline embolization device. Surg Neurol Int. 2013 Sep 6;4:114. doi: 10.4103/2152-7806.117711. eCollection 2013

Lin LM, Colby GP, Kim JE, Huang J, Tamargo RJ, Coon AL. Surg Neurol Int. Immediate procedural outcomes in 44 consecutive Pipeline Flex cases: the first North American single-center series. 2013 Sep 6;4:114. doi: 10.4103/2152-7806.117711. eCollection 2013

Colby GP, Lin LM, Gomez JF, Paul AR, Huang J, Tamargo RJ, Coon AL. Immediate procedural outcomes in 35 consecutive pipeline embolization cases: a single-center, single-user experience. J Neurointerv Surg. 2013 May;5(3):237-46. doi: 10.1136/neurintsurg-2012-010299. Epub 2012 Mar 29

Activities & Honors


  • Richard J. Otenasek Faculty Teaching Award, Department of Neurological Surgery, Johns Hopkins University, Baltimore, MD, 2012


  • Member
    American Association of Neurological Surgeons
  • Member
    Congress of Neurological Surgeons
  • Member
    European Society for Minimally Invasive Neurologic Therapy (ESMINT)
  • Senior Member
    Society for Neurointerventional Surgery (SNIS)

Videos & Media

Stroke Surgery - Tabatha's Story

Recent News Articles and Media Coverage

New surgery technique at Hopkins gives teenage aneurysm patient chance at a normal life, Baltimore Sun, March 26, 2017

Patient testimonial: Brianna's Story (February 2017)

A New Way to Treat Ischemic Stroke, NeuroLogic (Fall 2015)

A Moment's Notice: Coordinated advanced stroke care saves young patient, Johns Hopkins Bayview Health and Wellness News (Summer 2015)

Offering an Aneurysm Cure, NeuroNow (Spring 2013)

Press release: Adding Stent During Minimally Invasive Surgery To Repair Aneurysms Prevents Recurrence (07/28/2011)

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