On October 20, an actress who had announced a multiple sclerosis diagnosis in 2021 told listeners of her own podcast that her doctors no longer believe she has MS at all. After five years, she described feeling back at square one — still symptomatic, but without an explanation for what is actually causing it. Reporting noted no suggestion her own doctors committed malpractice. Her story still matters in Florida: it shows the harm a wrong diagnosis can do, which is not the same problem as a diagnosis that comes late.

A Wrong Diagnosis Harms You Twice

Most people think of misdiagnosis as a missed disease — cancer found months late, a heart attack sent home as heartburn. A wrong diagnosis is the mirror image: a doctor affirmatively names a condition you do not have. The harm then runs in two directions at once. You receive treatment for the wrong condition — sometimes powerful medication with serious side effects and procedures you never needed. At the same time, the condition actually causing your symptoms goes untreated and may quietly worsen.

Research cited in coverage of the October reversal suggests roughly 15% to 20% of people diagnosed with MS may be misdiagnosed, though rates vary by study population. MS shows why: no single test definitively confirms it, and its symptoms and imaging can resemble migraine, lupus, neuropathy, and other autoimmune disorders. A scan that looks like MS is not always MS — which is why the workup around the scan matters.

Not Every Wrong Diagnosis Is Malpractice

Florida law does not make a doctor liable simply because a diagnosis turned out to be wrong. Medicine is not an exact science, and a careful doctor can reach a reasonable conclusion that later proves incorrect, especially with conditions that mimic each other. As the Florida firm analyzing the October story put it, doctors can make reasonable diagnostic decisions that later prove wrong, particularly with complex conditions.

A claim requires more: that the provider’s care fell below the prevailing standard of care — what a reasonably careful provider in the same specialty would have done under similar circumstances — and that the shortfall actually caused harm. An incorrect label with no injury and no lost chance to treat the real condition is frightening, but it is not, by itself, a malpractice case.

The Differential: What Careful Diagnosis Requires

The legal question is usually about process, not hindsight. Careful diagnosis means building a differential — a working list of conditions that could explain the symptoms — and then testing, referring, and following up until the list is responsibly narrowed. Warning signs in the records often include: settling on the first plausible explanation and never revisiting it as symptoms evolve; failing to order the standard tests for the presentation; misreading imaging, laboratory, or pathology results; failing to refer to a specialist when the picture does not fit; and failing to tell the patient what else was ruled out — or not ruled out — and what should trigger a return visit.

That is why the paper trail decides these cases: the imaging and radiologist’s report, laboratory values, referral notes, and visit notes showing what was considered. A second doctor’s different conclusion does not prove negligence — but the records can show whether the first workup met the standard of care.

Fault and Deadlines in Florida Misdiagnosis Cases

Misdiagnosis is medical malpractice, so Chapter 766 applies, including pre-suit review by a qualified medical expert before suit may be filed — and that investigation takes time. Medical malpractice is also the exception to Florida’s general fault rule. Most Florida negligence claims follow modified comparative negligence, barring recovery if a person is more than 50% at fault. Chapter 766 claims still follow pure comparative negligence: the patient’s share of fault reduces recovery but does not bar it entirely.

The deadlines are strict. A claim generally must be commenced within two years from when the incident occurred, was discovered, or should have been discovered with reasonable diligence, and a statute of repose generally bars claims more than four years after the incident, with a limited extension for fraud or concealment that never exceeds seven years. A reversed diagnosis can start that clock — do not assume you have years to decide.

What to Do If You Think the Diagnosis Was Wrong

Get care first, and do not stop prescribed medication on your own because a diagnosis is in doubt — ask the doctor how to transition safely. Request the complete record in writing, including imaging, laboratory, and pathology reports, not just visit summaries. Write a timeline: each diagnosis, the treatment that followed, its side effects and costs, and when the real condition was found. Keep the bills — in a wrong-diagnosis case, the unnecessary treatment is part of the harm.

If you or a loved one was harmed by a wrong diagnosis in Miami-Dade or Broward County, Tacher Law offers free consultations for medical malpractice and other personal injury matters. Call +1 (305) 644-2211 or visit our contact page to discuss your situation.

Tacher Law, 16445 Collins Avenue, Suite 1625, Sunny Isles Beach, FL 33160.