Part D Transition Supply: Is One Owed, and How Much?
Whether a Part D plan owes a temporary transition supply, and how many days.
Open the tool → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Status of the drug on the plan
- Not on the plan's formulary
- Date coverage under the plan took effect
- 2026-01-01
- Date of the fill request
- 2026-02-10
- Days in the approved one-month supply
- 30 days
- Days already supplied under transition for this drug
- 0 days
- An immediate formulary change
- No
Result: A transition supply of 30 days is owed.
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Status of the drug on the plan
- Date coverage under the plan took effect (YYYY-MM-DD)
- Date of the fill request (YYYY-MM-DD)
- Days in the approved one-month supply
- Days already supplied under transition for this drug (0 if none)
- An immediate formulary change
- Days written on the prescription
- Date the temporary fill adjudicated (YYYY-MM-DD)
The other 3 fields
- New to the plan, or a continuing member whose drug changed for the new year
- Lives in a long-term care facility
- Emergency supply of this drug already given this stay
How this is calculated
Citation
42 CFR 423.120(b)(3): a transition process for non-formulary drugs and drugs with prior authorization or step therapy: a one-time temporary supply of at least an approved month of medication within the first 90 days of coverage, and written notice within 3 business days of the fill. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.