COB Playbook

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Renal Chronic Dialysis
Began
(month and year)
No waiting period
+ 30 month COB
period
= date Medicare is
primary
3 Month waiting
period
+ 30 month COB
period
= date Medicare is
primary
January 2015 July 1 2017 October 1 2017
February 2015 August 1 2017 November 1 2017
March 2015 September 1 2017 December 1 2017
April 2015 October 1 2017 January 1 2018
May 2015 November 1 2017 February 1 2018
June 2015 December 1 2017 March 1 2018
July 2015 January 1 2018 April 1 2018
August 2015 February 1 2018 May 1 2018
September 2015 March 1 2018 June 1 2018
October 2015 April 1 2018 July 1 2018
November 2015 May 1 2018 August 1 2018
December 2015 June 1 2018 September 1 2018
For a complete Reference Chart for dates from
January 2005 – December 2021 ,
Regular Chronic Dialysis Began (RCBD) /
First Date of Dialysis Ever (FDODE)
COB Reference Chart
2015