Admin. Rules of Montana-Dept. #37-Subchapter 2-Network Adequacy for Managed Care

(1) In order to be deemed adequate, a health carrier’s network must include one mid-level PCP per 1,500 projected enrollees or one physician PCP per 2,500 projected enrollees.

See http://www.mtrules.org/gateway/ChapterHome.asp?Chapter=37%2E108