# Medicare Program; Interest Calculation
> **Centers for Medicare and Medicaid Services** · Final rule. · Published 2004-07-30 · Effective 2004-10-01 · 69 FR 45604
## Document
- **Document number:** 04-17316
- **Category:** medicare
- **Sub-agency:** Centers for Medicare and Medicaid Services
- **Federal Register citation:** 69 FR 45604
- **CFR reference:** 42 CFR 405
- **Publication date:** 2004-07-30
- **Effective date:** 2004-10-01
- **HHS docket:** CMS-6014-F
## Abstract

This final rule changes the way we calculate interest on Medicare overpayments and underpayments to providers, suppliers, health maintenance organizations, competitive medical plans, and health care prepayment plans to be more reflective of current business practices. This change reduces the amount of interest assessed on overpayments and underpayments and simplifies the way the interest is calculated. This change in the way we calculate interest also applies to Medicare Secondary Payer debt.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2004/07/30/04-17316/medicare-program-interest-calculation)
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