# Share vials and round doses to stop throwing away expensive drug

Source: https://onco.cc/ideas/idea-cost-vial-sharing-dose-rounding/  
OnCo record `idea-cost-vial-sharing-dose-rounding` (Idea). Data CC BY-NC 4.0, attribute "Data from OnCo (onco.cc)"; commercial use needs a licence.

## TL;DR

Weight-based doses rarely match vial sizes, so the leftover is discarded and still billed; closed-system vial sharing and rounding doses to the nearest vial within 10% eliminate most of that waste.

## Summary

Medicare pays for discarded drug under the JW modifier and, since 2023, requires refunds from manufacturers for waste above 10% under the Infrastructure Investment and Jobs Act. Pharmacies can avoid the waste in the first place: closed-system transfer devices extend the in-use stability of single-dose vials so one vial serves several patients, and dose banding (rounding to the nearest vial size within a defined tolerance) is standard in the NHS. Both are cheap and can be implemented by a hospital pharmacy in months.

## Fields

- Kind: Idea
- Last checked: 2026-09-10
- Hypothesis: Dose rounding and vial sharing will reduce discarded drug for the ten highest-spend Part B oncology drugs by more than 70% in participating centres.
- Rationale: The NHS national dose-banding tables and multiple US single-centre studies report six- and seven-figure annual savings per institution.
- Proposed test: Pharmacy-level before-and-after audits of JW-modifier billing and drug spend, with a registry of any stability or safety issues.
- Maturity: being-tested-at-scale
- Actor: clinic

## Sources

- CMS: Discarded drug refunds (JW and JZ modifiers) (page moved; nearest live section): https://www.cms.gov/medicare/payment/part-b-drugs/

## Connected records

- fronts: [Chemotherapy](https://onco.cc/fronts/chemotherapy/), [Immunotherapy](https://onco.cc/fronts/immunotherapy/)
- bottlenecks: [Prices and value](https://onco.cc/bottlenecks/b-drug-pricing/), [Wrong doses](https://onco.cc/bottlenecks/b-dose-optimisation/)

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