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Andrea L. Diederich

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ALDiederich@mdwcg.com

Portrait of Andrea L. Diederich

Andrea focuses her practice on the defense of matters involving medical malpractice, veterinary malpractice, premises liability, employment discrimination and The Americans With Disabilities Act.  She represents hospitals, physicians, veterinarians, nurses, and therapists in health care and professional liability matters. Andrea is a member of the Florida Bar, the Orange County Bar Association and the Central Florida Medical Malpractice Claims Council. 

Andrea has experience representing veterinarians in professional licensing matters. In one such case, Andrea successfully defended a veterinarian in a claim against her license involving a surgical procedure performed on a canine. After reviewing the response to the Complaint, the Probable Cause Panel of the Board of Veterinary Medicine determined that the case should be closed without any further investigation or impact on the veterinarian’s license.   

Prior to joining Marshall Dennehey, Andrea focused her practice on defending clients in high-exposure medical malpractice, premises liability and automobile negligence matters. Andrea was also a paralegal for seven years at a plaintiff's law firm specializing in complex medical malpractice cases.

Andrea is native of Peru and is fluent in Spanish. She has traveled extensively and studied in Madrid, Spain. In 2001, Andrea earned a Bachelor of Arts in international relations and foreign languages from Rollins College in Winter Park, Florida. She received her juris doctor from Florida A&M University College of Law in December of 2007.

    • Florida A&M University College of Law (J.D., 2007)
    • Rollins College (B.A., 2001)
    • Florida, 2008
    • U.S. District Court Middle District of Florida, 2011
    • U.S. Court of Appeals 11th Circuit, 2013
    • American Bar Association
    • Central Florida Medical Malpractice Claims Council, Inc.
    • Florida Bar Association
    • Orange County Bar Association
    • "Effective Communication Strategies For Deaf Patients,"Healthcare Business Today, September 12, 2017
    • "Florida’s Apparent Increase on Caps for Damages Recoverable in Cases Against Providers of Foster Care Services Is Misleading," Defense Digest, Vol. 21, No. 2, June 2015
    • Case Law Alerts, regular contributor, 2013-present
    • “New Change to Florida Law Affects Physicians' Ability to Retain Out of State Experts to Defend Medical Malpractice Suits,” South Florida Hospital News, Vol 8 Iss 6 December 2011

Firm Highlights

Jason Banonis Holds PDI Attorney of the Year Award with the PDI President

News

Jason Banonis Named Attorney of the Year by the Pennsylvania Defense Institute

Portrait of Carolyn Schweizer, with text below: Philadelphia Office Managing Attorney

News

Marshall Dennehey Names Carolyn Schweizer New Philadelphia Office Managing Attorney

Marshall Dennehey Announces 2026 Ohio Super Lawyers and Rising Stars

News

Marshall Dennehey Announces 2026 Ohio Super Lawyers and Rising Stars

Thought Leadership

Delaware Superior Court Clarifies Pleading Standard for Legal Malpractice Claims

In the matter of Edelstein v. Kirschner, No. N25C-09-018 FJJ, 2026 Del. Super. LEXIS 45, at *1 (Super. Ct. Jan. 29, 2026), the plaintiff law firm sued its former client for unpaid legal fees in the amount of $4,399.35. The former client asserted a counterclaim alleging legal malpractice. More, specifically, the former client claimed that his lawyer committed malpractice be recommending that he settle an underlying lawsuit by entering into a stipulated judgment for an excessive amount with interest that was accruing at “an outlandish” interest rate. The law firm moved to dismiss the counterclaim on the basis that its former client had not alleged facts reflecting that he could prove the case within the case. That is, facts reflecting that his attorneys caused him to lose the underlying case. The Superior Court held that while a legal malpractice plaintiff in cases arising from underlying litigation must prove the case within the case to survive a summary judgment motion, he does not need to plead facts reflecting as much in order to survive a motion to dismiss. While this case addresses the pleading requirements of a legal malpractice case in Delaware, it also serves as reminder that chasing unpaid legal fees from a former client can often give rise to a legal malpractice counterclaim. Attorneys seeking to collect unpaid legal fees should ensure that the fees they seek are for a significant amount, which would be recoverable if a judgment is obtained. Otherwise, the effort could backfire.

Thought Leadership

Fla. Workers' Comp Physician Dispensing Ruling Could Produce New Legislative Fight

In a significant decision issued on February 25, 2026, the First District Court of Appeal (DCA) ruled in Publix Super Markets, Inc., et al. v. Department of Financial Services, et al., 430 So. 3d 252 (Fla. 1st DCA 2026), that while injured workers have an absolute right to choose their own pharmacy or pharmacist, that right does not extend to physicians who dispense medications directly to their patients.  Read Blake's article in Insurance Journal: https://www.insurancejournal.com/news/southeast/2026/08/05/880229.htm. 

Thought Leadership

Appellate Division Affirms Dismissal of Legal Malpractice Counterclaim Against Martin Law Firm

In Martin v. Loury, 2026 N.J. Super. Unpub. LEXIS 1617 (App. Div. July 15, 2026), Martin Law Firm represented Kirk Loury in an employment matter Mr. Loury filed against his former employer, Concord Equity Group Advisors LLC (“Concord”). The allegations included, among other things, that Loury was not fairly compensated for his employment with Concord. After a bench trial finding in Loury’s favor, the Appellate Division remanded this matter in February 2016 for a second trial. During the second trial, Concord CEO, Lee Argush, testified to lower compensation estimate than first trial. On remand, the second trial judge awarded Mr. Loury the same damages as the first judge, finding Mr. Argush not credible. After the findings during the second trial, Martin Law Firm filed an action against Mr. Loury to recover legal fees and costs of representing Mr. Loury in a second bench trial and Mr. Loury filed a counterclaim against Martin Law Firm for legal malpractice, alleging he should have received an even higher award in the second bench trial. In this allegation, Mr. Loury, through his expert, claimed that Martin Law Firm should have recalled Mr. Loury to the stand to rebut Mr. Argush’s testimony to allege an alternative theory of damages. Mr. Loury’s expert admitted that the second judge already rejected Mr. Argush's theory and accepted Loury's damages theory. The trial court barred Mr. Loury’s expert and dismissed Loury's counterclaim with prejudice before convening the collection trial, and the jury ruled in Martin Law Firm’s favor. Mr. Loury appealed the trial court's pretrial rulings barring his liability expert from testifying in support of his legal malpractice counterclaim, denying his motion for summary judgment on that counterclaim, and denying his motion to amend his counterclaim by adding attorney Joseph A. Martin as a codefendant. In affirming the trial court’s decision, the Appellate Division held that the trial court properly excluded Loury’s expert testimony in the counterclaim against Martin Law Firm because the expert could not explain how calling Loury as a rebuttal witness would have increased damages when the second judge already rejected Mr. Argush's testimony and accepted Loury's damages theory, making the expert’s causation opinion speculative. The Appellate Division also held that the trial court properly denied Mr. Loury's summary judgment motion on his malpractice counterclaim because reasonable minds could differ on whether Mr. Martin's alleged failures would have changed the second judge's damages award, given the judge already found Mr. Argush not credible, creating genuine factual disputes precluding summary judgment. Also, the Appellate Division held that the trial court properly denied Loury's May 2023 motion to add Joseph Martin individually because the statute of limitations expired in February 2022, six years after the 2016 appellate remand when Mr. Loury incurred new legal costs, and relation back did not apply because Mr. Loury knew Mr. Martin's identity throughout and strategically chose to sue only Martin Law Firm in his 2019 counterclaim.

Result

Summary Judgment Secured, Preserving $750,000 in Coverage for Insured in Major Trucking Liability Dispute

Ray Freudiger and Michael A. Roberts (both of Cincinnati) successfully obtained summary judgment on behalf of their client in a coverage dispute arising from a May 19, 2022, motor vehicle accident. A permissive driver operated a box truck for an interstate trucking company and caused severe injuries to two tort victims. Prior to the accident, the insured had procured a commercial auto policy for the trucking company with stated limits of $1,000,000. Following the accident, the insurer initiated a declaratory judgment action asserting that only reduced bodily injury limits of $25,000/$50,000 applied and later counterclaimed, alleging it would not have insured the driver had he been properly submitted for approval under the policy. After extensive discovery, briefing, and oral argument, the court rejected the insurer’s attempt to shift responsibility for the $750,000 in coverage it was legally required to provide for permissive drivers under Ohio law, granting summary judgment in favor of the insured and preserving $750,000 in liability exposure.

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Result

Summary Judgment Secured for Life Insurance Agent

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Result

Defense Verdict in Complex Medical Malpractice Trial

Result

No-Cause Jury Verdict Secured in Wrongful Death Trial

We successfully obtained a no-cause jury verdict in a 13-day wrongful death trial. The decedent, a 59-year-old man, was admitted to the emergency room on February 15, 2019, with complaints of abdominal pain, decreased appetite, and constipation, despite the use of laxatives. The patient did not complain of any nausea, vomiting, or diarrhea. He had a significant medical history including diabetes, hypertension, prior coronary artery stenting, morbid obesity (with past gastric bypass surgery), longstanding ventral hernia, and back pain. A CT scan revealed multiple hernias and a potential closed-loop bowel obstruction, leading to a surgery consultation. Our client, an emergency general surgeon, interpreted that the patient did not have a closed loop or any significant obstruction and recommended non-surgical management. The patient was approved to have clear liquids, and had a vomiting incident shortly after, but our client was not notified. The patient was returned to NPO status, and after improving overnight, he was returned to “clears” and additional medical and renal consults were ordered. Our client did not receive any communications from the residents/nurses of any changes in the patient’s condition. On February 18, 2019, two rapid responses were called due to increased heart rate and vomiting. It is believed that the vomiting resulted in aspiration, causing sepsis, ultimately leading to the patient’s death. During the trial, the plaintiff’s sole medical expert highlighted imaging on the wrong hernia, which called into question all of his opinions in the case. We made key objections related to the expert testimony, limiting what the allegations were, and preventing new allegations from being made. After approximately two and a half hours of deliberating, the jury returned a no-cause verdict.