The Basic Rules

30.1.1 - The Basic Rules (Rev. 67, Issued: 08-12-05; Effective: 10-01-04) The CMS will charge interest on overpayments and pay interest on underpayments to HMO/CMPs, except as specified in §§30.2.2 and 30.4. Interest will accrue from the date of the final determination as defined in §30.1.2, and either will be charged on the overpayment balance or paid on the underpayment balance for each 30-day period that payment is delayed. Effective October 1, 2004, interest will be assessed only for full 30-day periods when payment is not made on time. For example, if there is an outstanding balance due CMS or the HMO/CMP for 45 days beginning on the day after the date of the final determination, only one month of interest will be assessed.