Medical Professional Liability

What it is

Medical professional liability (MPL) is the insurance-industry name for medical malpractice insurance and the broader segment of casualty insurance that covers professional liability claims against physicians, surgeons, hospitals, nurses, and allied health professionals. The line covers indemnity payments to claimants, defense costs, and ancillary expenses arising from claims of professional negligence.

How it differs from general liability

MPL is a distinct line of casualty insurance because the underwriting variables (specialty, claims history, jurisdiction, procedure mix) and loss patterns (long tail, high severity, low frequency) differ substantially from general liability. Most MPL is written by specialty carriers; some is self-insured by large hospital systems through captives.

Why severity makes it distinct

MPL is the most severity-pressured line in casualty insurance, with the highest occurrence-severity figure across all casualty lines. The severity trend has outpaced general casualty inflation for years and shows no sign of moderating once accident-year immaturity is accounted for.

Coverage structures

Two coverage forms dominate: occurrence (covers claims arising from incidents during the policy period, regardless of when the claim is reported) and claims-made (covers claims first reported during the policy period, regardless of when the underlying incident occurred). Claims-made policies typically require an extended reporting endorsement ("tail coverage") at the end of a practitioner's career to cover late-reported claims.

In settlement strategy

For counsel on either side, understanding the coverage form and limits in play (per-claim, aggregate, self-insured retention) is foundational to settlement posture and demand calibration.