Have to pay health insurance after injury settlement in MA?

Typically, contracts for health insurance contain subrogation clauses in which you, the insured, agree to repay your insurance carrier for amounts paid to you in the event that you collect from a third party.  So, as in your slip and fall case, when you collect money from the owner of the property (or her insurer) where you fell and injured yourself, your health insurer is entitled to enforce that contract provision.  If an attorney handled your case, you should talk to her about this matter.  In some cases, insurance companies may discount the amount they seek to collect from the injured party.  Hope that helps.