Ins 17.28(4)(a)(a) Definition. In this subsection, “semimonthly period” means the 1st through the 14th day of a month or the 15th day through the end of a month. Ins 17.28(4)(b)(b) Entry during fiscal year; prorated annual fee. If a provider begins practice or operation or enters the fund under sub. (3s) (b) after the beginning of a fiscal year, the fund shall charge the provider one twenty-fourth of the annual fee for each semimonthly period or part of a semimonthly period from the date fund coverage begins to the next June 30. Ins 17.28(4)(c)(c) Ceasing practice or operation; refunds. A provider or person acting on the provider’s behalf shall notify the fund in the form specified by the fund if any of the following occurs: Ins 17.28(4)(c)3.3. This state is no longer a principal place of practice for the provider. Ins 17.28(4)(c)4.4. The provider has temporarily or permanently ceased practice or has ceased operation. Ins 17.28(4)(cm)(cm) Eligibility for exemption; refund. If a provider claims an exemption after paying all or part of the annual fee, the fund shall issue a refund equal to one twenty-fourth of the provider’s annual fee for each full semi-monthly period from the date the provider becomes eligible for the exemption to the due date of the next payment. The refund for any past exemption period will be limited to the current fiscal year and the immediate prior fiscal year. Ins 17.28(4)(cs)1.1. If a provider who has paid all or part of the annual fee is or becomes ineligible to participate in the fund under s. 655.003 (1) or (3), Stats., or because he or she does not practice in this state, the fund shall issue a full refund of any amount the provider paid for fund coverage for which he or she was not eligible. Ins 17.28(4)(cs)2.2. If a provider that has paid all or part of the annual fee is ineligible for fund coverage because the provider is not in compliance with sub. (3e), the fund shall issue a full refund of the amount paid for the period of noncompliance, beginning with the date the noncompliance began. Ins 17.28(4)(d)1.1. If a provider’s change of classification under sub. (6) during a fiscal year results in an increased annual fee, the fund shall adjust the provider’s annual fee to equal the sum of the following: Ins 17.28(4)(d)1.a.a. One twenty-fourth of the annual fee for the provider’s former classification for each full semimonthly period from the due date of the provider’s first payment during the current fiscal year to the date of the change. Ins 17.28(4)(d)1.b.b. One twenty-fourth of the annual fee for the provider’s new classification for each full or partial semimonthly period from the date of the change to the next June 30. Ins 17.28(4)(d)2.2. The fund shall bill the provider for the total amount of the increase under subd. 1. if the provider has already paid the total annual fee, or shall prorate the increase over the remaining installment payments. Ins 17.28(4)(e)1.1. If a provider’s change of classification under sub. (6) during a fiscal year results in a decreased annual fee, the fund shall adjust the provider’s annual fee to equal the sum of the following: Ins 17.28(4)(e)1.a.a. One twenty-fourth of the annual fee for the provider’s former classification for each full or partial semimonthly period from the due date of the provider’s first payment during the current fiscal year to the date of the change. Ins 17.28(4)(e)1.b.b. One twenty-fourth of the annual fee for the provider’s new classification for each full semimonthly period from the date of the change to the next June 30. Ins 17.28(4)(e)2.2. The fund shall credit the amount of the decrease under subd. 1. over any remaining installment payments. If the provider has already paid the total annual fee, the fund shall issue a refund if the amount of the refund is more than $10. The fund shall credit any amount of $10 or less to the provider’s account. If the provider no longer participates in the fund, a credit of $10 or less shall lapse to the fund. Ins 17.28(4)(f)(f) Refund of other charges. If a provider is entitled to a refund or credit under this subsection, the fund shall also issue a refund or credit of the unearned portion of any amounts paid as surcharges using the same method used to calculate a refund or credit of an annual fee. A mediation fund fee is refundable only if the provider did not participate in the injured patients and families compensation fund for any part of the fiscal year. Ins 17.28(4)(g)(g) Refund for administrative error. In addition to any refund authorized under par. (c), (cm), (cs), (e) or (f), the fund may issue a refund to correct an administrative error in the current or any previous fiscal year. Ins 17.28(4)(h)(h) Billing; entire fiscal year. Except as provided in sub. (6e) (b), for each fiscal year, the fund shall issue to each provider participating in the fund an initial bill which shall include all of the following: Ins 17.28(4)(h)3.3. The balance and accrued interest, if any, due from a prior fiscal year. Ins 17.28(4)(h)4.4. Notice of the provider’s right to pay the amount due in full or in instalments.