# Andrew Tisser, DO, MBA > Andrew Tisser, DO, MBA, CPE, CHCQM-PHYADV is a board-certified emergency physician and emergency medicine expert witness. He provides objective medical-legal case review, medical record analysis, written expert reports, and deposition and trial testimony for plaintiff and defense attorneys nationwide. ## Key facts - Name: Andrew Tisser, DO, MBA, CPE, CHCQM-PHYADV - Role: Emergency Medicine Expert Witness - Board certification: Board-Certified Emergency Physician - Clinical experience: 10+ years across academic, community, rural, critical access, and trauma settings - Medical-legal engagements: 75+, retained by both plaintiff and defense counsel - Leadership: Former Associate Chair, Emergency Medicine and Physician Advisor (Catholic Health System); former Medical Director, Urgent Care (Rochester Regional Health) - Physician executive experience: Medical Director, Utilization Management at Alignment Health (2026 to present); prior Medical Director, Claims Administration & Payment Integrity at Humana (2023 to 2026), issuing 8,000+ written clinical determinations annually through the ALJ level - Education: Doctor of Osteopathic Medicine, NYIT College of Osteopathic Medicine; MBA, Healthcare Management, Western Governors University - Availability: Nationwide. Licensed in 12 states (FL, IL, IN, KY, LA, NH, NY, OK, SC, TX, VA, WI). - LinkedIn: https://www.linkedin.com/in/andrewtisserdo - Approach: Evaluates care against the standard of care at the time it was delivered, not with hindsight. - Note: Physician advisor and health plan experience strengthens medical record analysis; emergency medicine expertise comes from clinical practice. ## Contact - Phone: 917-232-7719 - Email: andrew@andrewtisserdo.com - Website: https://www.andrewtisserdo.com ## Primary pages - [Home](https://www.andrewtisserdo.com/): Overview and positioning - [About](https://www.andrewtisserdo.com/about): Background, experience, and approach - [Credentials](https://www.andrewtisserdo.com/credentials): Canonical record of board certification, education, and licensure - [Expert Witness Services](https://www.andrewtisserdo.com/expert-witness-services): Case review, reports, deposition, and trial testimony - [Case Types](https://www.andrewtisserdo.com/case-types): Clinical and operational areas reviewed - [FAQ](https://www.andrewtisserdo.com/faq): Common questions from counsel - [Contact](https://www.andrewtisserdo.com/contact): Request a confidential consultation ## Insights - [The Emergency Department Standard of Care, Explained](https://www.andrewtisserdo.com/insights/emergency-department-standard-of-care): What the standard of care means in emergency medicine, how it is defined, and how it is applied to real emergency department decisions. - [Failure to Diagnose in Emergency Medicine](https://www.andrewtisserdo.com/insights/failure-to-diagnose-emergency-medicine): How failure-to-diagnose claims arise in the emergency department, the conditions most often involved, and how the standard of care is applied. - [Chest Pain Evaluation in the Emergency Department](https://www.andrewtisserdo.com/insights/chest-pain-evaluation-emergency-department): How emergency physicians evaluate chest pain, risk-stratify for acute coronary syndrome, and make disposition decisions. - [Sepsis Recognition in the Emergency Department](https://www.andrewtisserdo.com/insights/sepsis-recognition-emergency-department): How sepsis is recognized and treated in the emergency department, and how timing and escalation are evaluated. - [Stroke Recognition and Treatment in Emergency Medicine](https://www.andrewtisserdo.com/insights/stroke-recognition-emergency-medicine): How emergency physicians recognize stroke, manage time-sensitive treatment windows, and coordinate imaging and specialist care. - [Pulmonary Embolism Evaluation in the Emergency Department](https://www.andrewtisserdo.com/insights/pulmonary-embolism-evaluation): How emergency physicians assess for pulmonary embolism using structured risk assessment and testing thresholds. - [Acute Coronary Syndrome in the Emergency Department](https://www.andrewtisserdo.com/insights/acute-coronary-syndrome-emergency-medicine): How acute coronary syndrome is evaluated in the emergency department, including ECG interpretation, troponin, and disposition. - [Emergency Physician Documentation and the Medical Record](https://www.andrewtisserdo.com/insights/emergency-physician-documentation): Why emergency department documentation matters in litigation and how the record is read in a standard-of-care analysis. - [Emergency Department Disposition Decisions](https://www.andrewtisserdo.com/insights/emergency-department-disposition-decisions): How admit, discharge, transfer, and observation decisions are made and evaluated in the emergency department. - [Boarding and Patient Safety in the Emergency Department](https://www.andrewtisserdo.com/insights/boarding-and-patient-safety): How emergency department boarding affects patient safety and how systems-level failures are evaluated. - [Medical Decision Making Under Uncertainty](https://www.andrewtisserdo.com/insights/medical-decision-making-under-uncertainty): How emergency physicians make decisions with incomplete information, and why that reality shapes the standard of care. - [Emergency Department Triage](https://www.andrewtisserdo.com/insights/emergency-department-triage): How triage works, how acuity is assigned, and how triage decisions are evaluated in litigation. - [EMTALA and the Emergency Department](https://www.andrewtisserdo.com/insights/emtala-emergency-medicine): What EMTALA requires of emergency departments, including medical screening, stabilization, and transfer obligations. - [How Emergency Physicians Think](https://www.andrewtisserdo.com/insights/how-emergency-physicians-think): The reasoning approach emergency physicians use, and why it differs from other specialties. - [Common Misconceptions About Emergency Medicine](https://www.andrewtisserdo.com/insights/common-misconceptions-emergency-medicine): Frequent misunderstandings about emergency care that can distort a standard-of-care analysis. - [How Expert Witnesses Evaluate Emergency Care](https://www.andrewtisserdo.com/insights/how-expert-witnesses-evaluate-emergency-care): The method a credible emergency medicine expert uses to evaluate a case, from records to opinions. ## Selected FAQs ### Who is Dr. Andrew Tisser? Dr. Andrew Tisser is a board-certified emergency physician with more than ten years of clinical practice across academic, community, rural, critical access, and trauma settings. He serves as an emergency medicine expert witness for attorneys nationwide and has been retained on both plaintiff and defense matters. ### Why should an attorney retain Dr. Tisser? He combines active emergency medicine expertise with the analytical discipline of a physician executive. His work is objective and evidence-driven. He evaluates care against the standard of care at the time it was delivered, not with the benefit of hindsight. Attorneys receive clear opinions designed to withstand careful scrutiny. ### What types of cases does he review? Emergency medicine matters including failure to diagnose, sepsis, stroke, acute coronary syndrome, pulmonary embolism, trauma, abdominal and pediatric emergencies, triage, disposition, documentation, boarding, APP supervision, EMTALA, and systems failures, spanning medical negligence, wrongful death, and personal injury. ### Can Dr. Tisser testify nationwide? Yes. Dr. Tisser is available nationwide for emergency medicine expert witness consultation and testimony, and is licensed in 12 states. Serving as an expert witness does not require licensure in the state where the case is venued, though specific court and jurisdictional requirements are confirmed for each matter. ### How quickly are cases reviewed? Initial inquiries typically receive a reply within one business day. Turnaround for record review depends on case volume and complexity, and a realistic timeline is agreed on before work begins. ### Does he work for plaintiff or defense? Both. Dr. Tisser has been retained by plaintiff and defense counsel. His analysis does not change based on who retains him. The standard of care is the same either way, and that consistency is what makes an opinion credible. ### What records are needed to start? At minimum, the complete emergency department record, including triage and nursing notes, physician documentation, orders, medication administration, imaging and laboratory results, ECGs, and any EMS run sheets. Related prior and subsequent records, deposition transcripts, and the complaint help place the care in context. Gaps in the record are themselves informative. ### How are conflicts of interest screened? Before any substantive review, the parties, facilities, and providers involved are checked against prior engagements. If a conflict exists, you will be told promptly so no time is lost.