This is a case raising a proximate causation argument. To prove malpractice the plaintiff must allege and prove that but for the negligence of the attorney he would have won the underlying case. Here, in Ackerman v. Dembin, 2020 NY Slip Op 32398(U), a doctor was disciplined by the New York Department of Public Health for professional misconduct. The major issue in the case was a claim that the lawyers failed to adequately defend a claim of an improper procedure. Apparently, after he agreed to a three-year period of probation the doctor obtained new counsel who corrected the record.
The Facts
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Chicago Legal Malpractice Lawyer Blog

