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 2014 July 1 2016 October 1 2016
February 2014 August 1 2016 November 1 2016
March 2014 September 1 2016 December 1 2016
April 2014 October 1 2016 January 1 2017
May 2014 November 1 2016 February 1 2017
June 2014 December 1 2016 March 1 2017
July 2014 January 1 2017 April 1 2017
August 2014 February 1 2017 May 1 2017
September 2014 March 1 2017 June 1 2017
October 2014 April 1 2017 July 1 2017
November 2014 May 1 2017 August 1 2017
December 2014 June 1 2017 September 1 2017
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
2014