In most states in this country there is only the superior court broken down into the small claims division (claims up to $7,500 in California), limited jurisdiction (claims for .01 to $25,000 in California) and unlimited jurisdiction (claims over $25,001.00 in California).Since you are owed $15,000 plus accrued interest by a friend for the loan for dental work, you would be in the limited jurisdiction of the superior court if in California for a lawsuit.You should go down to the county court house and speak with the court clerk asking him or her what jurisdiction of the superior court would you file your lawsuit for $15,000 plus interest in the State of Washington.Good luck.