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If you have questions or comments regarding any information on the Worker's Compensation website or need an alternate format, please contact us by email at dwddwc@dwd.wisconsin.gov or by phone at (608) 266-1340.

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Insurance Letters

The WC Division issues Insurance Letters to communicate information with external WC customers. The reasons vary but may include the need to communicate changes in policies or procedures, to highlight law changes and impacts on external WC customers, to announce benefit rate changes, to distribute annual assessments, or to announce a new program or new technology that strengthens customer service.

Standard Letters

Listing of all Standard Letters Organized by Type

Insurance Letters

Insurance Letters - Current
Letter Date Description
Ins 531 04/26/2021 To communicate to insurance carriers about the 2020 supplemental benefit reimbursement assessment rate.
Ins 530 12/07/2020 Announce 2021 maximum rates effective January 1, 2021.
Ins 529 12/04/2020 To communicate to insurance carriers and self-insured employers the new assessment rate and issue date information, and also to remind insurance carriers and self-insured employers that interest will accrue on all unpaid balances after 30 days. The Worker’s Compensation Administrative Assessment is issued annually.
Ins 528 10/22/2020 Agency Website Updates
Ins 527 12/23/2019 Amended Announcement of 2020 maximum rates effective January 1, 2020
Ins 526 12/20/2019 To communicate information concerning the upcoming launch of the new Department of Workforce Development's (DWD) redesigned public website on Thursday January 2, 2020.
Ins 525 12/16/2019 To communicate to insurance carriers about the 2019 supplemental benefit reimbursement assessment rate.
Ins 524 12/12/2019 Announce 2020 maximum rates effective January 1, 2020.
Ins 523 10/24/2019 To communicate to insurance carriers and self-insured employers the new assessment rate and issue date information, and also to remind insurance carriers and self-insured employers that interest will accrue on all unpaid balances after 30 days. The Worker’s Compensation Administrative Assessment is issued annually.
Ins 522 07/11/2019 To inform attorneys representing parties in worker's compensation disputes and claims handling offices of the latest methods for submitting Applications for Hearing and Litigated Mail
Ins 521 12/07/2018 To communicate to insurance carriers about the 2018 supplemental benefit reimbursement assessment rate. This includes information regarding deadlines and to remind insurance carriers that interest will accrue on all unpaid balances after 30 days. The Worker’s Compensation Supplemental Benefit Reimbursement Assessment is issued annually.
Ins 520 10/31/2018

Announce 2019 maximum rates effective January 1, 2019.

Wage and Rate Chart WKC-9572-P
Ins 519 10/31/2018 To communicate to insurance carriers and self-insured employers the new assessment rate and issue date information, and also to remind insurance carriers and self-insured employers that interest will accrue on all unpaid balances after 30 days. The Worker's Compensation Administrative Assessment is issued annually.
Ins 518 04/04/2018

New Procedure for the Submission of Applications for Hearing and Litigated Mail

Effective April 16th, 2018, please use the new fax number (608) 260-3053 for the submission of Applications for Hearing and Litigated Mail.
Ins 517 12/07/2017

Announce 2018 maximum rates effective January 1, 2018.
Ins 516 11/30/2017

To communicate to insurance carriers about the supplemental benefit reimbursement assessment. This includes information about deadlines and to remind insurance carriers that interest will accrue on all unpaid balances after 30 days. The annual Worker's Compensation Supplemental Benefit Reimbursement Assessment will be issued each year in November.
Ins 515 10/31/2017

To communicate to insurance carriers and self-insured employers the new assessment rate and issue date information, and also to remind insurance carriers and self-insured employers that interest will accrue on all unpaid balances after 30 days. The annual Worker's Compensation Administrative Assessment is issued each year in October.
Ins 514 12/16/2016 Announcing the maximum rates effective January 1, 2017
Ins 513 11/3/2016 To communicate to insurance carriers the new supplemental benefit reimbursement assessment. This includes information about deadlines and to remind insurance carriers that interest will accrue on all unpaid balances after 30 days. The annual Worker's Compensation Supplemental Benefit Reimbursement Assessment will be issued each year in November.
Ins 512 9/30/2016 To communicate to insurance carriers and self-insured employers the new assessment rate and issue date information, and also to remind insurance carriers and self-insured employers that interest will accrue on all unpaid balances after 30 days. The annual Worker's Compensation Administrative Assessment is issued each year in August.
Ins 511 4/16/2016 To inform claims offices and attorneys representing parties in worker's compensation disputes of the changes to the Certification of Readiness (COR) process and form (WKC-17717-DHA-E) effective May 1, 2016.
Ins 510 3/31/2016 To inform claims handling offices about Wisconsin Worker’s Compensation Act, Chapter 102, Wis. Stats., law changes effective March 2, 2016, relating to compensation rate changes, a fixed rate for electronic medical records, the maximum charge for a final medical report, the reduction of the statute of limitations for traumatic injuries, the provision allowing no offset of temporary disability based on wages for the first 24 hours an employee works while receiving retraining benefits under § 102.61(1) or (1m), Wis. Stats., and other changes.
Ins 509 3/2/2016 To announce that s. 102.44 (1) (c), Wis. Stats., was amended and s. 102.75 (1g), Wis. Stats., was created by 2015 Wis. Act 55, effective January 1, 2016, to provide for changes in the manner supplemental benefits are reimbursed.
Ins 508 2/23/2016 To announce changes in the maximum age for ending the social security reverse offset under s. 102.44 (5), Wis. Stats.
Ins 507 2/12/2016 To inform claim handling offices and attorneys representing parties in WC disputes that effective January 11, 2016, the duties of the administrative law judges for litigated cases have been transferred to the Division of Hearings and Appeals, Office of Worker's Compensation Hearings under the Department of Administration.
Ins 506 12/08/2015 Announce 2016 maximum rates effective January 1, 2016
Ins 505 12/01/2015 Inform claims handling office of changes to the Wisconsin Administrative Code, Chapter DWD 80, relating to Worker's Compensation that became effective November 1. 2015
Ins 504 8/20/2015 To communicate to insurance carriers and self-insured employers the new assessment rate and issue date information, and also to remind insurance carriers and self-insured employers that interest will accrue on all unpaid balances after 30 days. The annual Worker's Compensation Administrative Assessment is issued each year in August. NOTE: Replaces Ins 501
Ins 503 5/12/2015 To provide instruction on the proper submission of claims related information to the WC Division (WCD)
Ins 502 12/11/2014 To announce 2015 maximum rates effective January 1, 2015
Ins 501 8/21/2014 To communicate to insurance carriers and self-insured employers the new assessment rate and issue date information, and also to remind insurance carriers and self-insured employers that interest will accrue on all unpaid balances after 30 days. The annual Worker's Compensation Administrative Assessment is issued each year in August.
Ins 500 5/15/2014 To provide instruction on the proper submission of claims related information to the WC Division (WCD).
Ins 499 4/24/2014 To inform that Wisconsin Statute §102.43(5)(c); the provision that allows no offset of temporary disability compensation based on wages for the first 24 hours an employee works while receiving retraining benefits under s. 102.61(1) or (1m), will sunset effective May 1, 2014.
Ins 498 12/6/2013 Announce 2014 maximum rates effective January 1, 2014.(Rate Chart)
Ins 497 8/20/2013 To communicate to insurance carriers and self-insured employers the new assessment rate and issue date information, and also to remind insurance carriers and self-insured employers that interest will accrue on all unpaid balances after 30 days. The annual Worker’s Compensation Administrative Assessment will be issued each year in August.
Ins 496 6/3/2013 Inform insurers of a reduction to supplemental benefit reimbursement payments made to employers and insurers under s. 102.44 (1) (c), Wis. Stats., effective May 14, 2013
Ins 495 1/28/2013 Clarification of recent amendment to s. 102.13 (2) (c) about requirement for final treating practitioner report

Additional years are available at: Worker's Compensation Insurance Letters, Historic