OLDWICK, N.J.--(BUSINESS WIRE)-- #insurance--AM Best has upgraded the Financial Strength Rating to A (Excellent) from A- (Excellent) and the Long-Term Issuer Credit Rating to “a” (Excellent) from “a-” (Excellent) of Healthcare Providers Insurance Company and its reinsured affiliate, HPIC Risk Retention Group. Both companies are domiciled in Charleston, SC, and are members of Healthcare Providers Insurance Group (HPIC). The outlook of these Credit Ratings (ratings) has been revised to stable from