Four axes from current statute and agency guidance. Teal bar = substitution/assistance/access in place; amber = permissive or absent.
| Generic substitution mandate | Permissive |
| State Pharmaceutical Assistance Program | No broad SPAP |
| 90-day fills permitted | Allowed |
| PMP mandatory prescriber query | Required by statute |
Montana permits but does not mandate generic substitution. Under MCA § 37-7-505, a pharmacist may substitute a less expensive equivalent drug product unless the prescriber has indicated "dispense as written." The substitute must be FDA AB-rated.
The Montana Department of Public Health and Human Services administers Montana Medicaid (Healthy Montana Kids + Medicaid expansion) pharmacy benefits and maintains the Montana Medicaid PDL. Montana Medicaid runs primarily as fee-for-service. Non-preferred drugs require prior authorization.
Preferred Drug List: View current PDL
Prior authorization contact: Montana Medicaid Pharmacy: 1-800-624-3958
Montana previously operated Big Sky Rx, a state premium-payment SPAP. The program has been wound down for most enrollees. Low-income Montanans use Medicare Part D Extra Help (LIS), Montana Medicaid (if eligible), manufacturer Patient Assistance Programs, and SHIP (State Health Insurance Assistance Program) for Medicare enrollment counseling.
Eligibility: Big Sky Rx (premium-payment subsidy for Medicare beneficiaries qualifying for partial Extra Help) has been wound down; check current state.
Montana permits 90-day fills of non-controlled chronic medications. Out-of-state pharmacies must hold a Montana Nonresident Pharmacy license from the Board of Pharmacy. Federal CSA refill limits apply.
Montana operates the Montana Prescription Drug Registry (MPDR) administered by the Board of Pharmacy. Under MCA § 37-7-1502, prescribers must check the MPDR before initially prescribing certain controlled substances. Dispensers must report Schedule II-V dispensing within one business day.
PMP portal: Montana Prescription Drug Registry (MPDR)
Montana hosts a 340B network including Billings Clinic, St. Vincent Healthcare, FQHCs across the state, Ryan White clinics, and Indian Health Service facilities serving multiple reservations.
Find a 340B clinic in Montana: HRSA OPAIS database (MT filter)
Our sister site OmniRx maintains a federal-side patient assistance program directory covering manufacturer PAPs, foundation copay assistance, GoodRx-style discount cards, and 340B locators applicable nationwide.
Once the law side is clear, the next question is which pharmacy actually has the cheapest fill. Use the RxGrab Pharmacy Finder to compare CostPlus Drugs, Costco, Walmart, Amazon Pharmacy, and other discount pharmacies on your specific medication, and read our generic vs brand explainer for the bioequivalence rules behind every substitution.
Yes unless your prescriber wrote "dispense as written." Under MCA § 37-7-505 substitution is permissive.
The program has been wound down for most enrollees. Use federal Extra Help (Part D LIS) and Montana Medicaid (if eligible) for low-income drug-cost assistance.
Yes, Montana expanded Medicaid in 2016 under the HELP Act. The expansion population is covered with the same Montana Medicaid PDL.
Yes for certain controlled-substance prescriptions under MCA § 37-7-1502.