Washington State Medicaid policy for 2014:www.hca.wa.gov/medicaid/billing/documents/physicianguides/physician-related_services_mpg.pdf
Page 2 says, "Added naturopathic physicians (taxonomy 175F00000X) to the list of professionals who can provide and bill physician-related services," and also "Provider Eligibility - Which health care professionals does the agency not enroll? Removed naturopaths from the list."
Furthermore, WA has had an ongoing policy of requiring insurance companies to pay for "Complementary and Alternative Medicine." I'm pleased to find out the ACA has explicitly stated that insurance companies cannot discriminate against Naturopathic physician services.