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 2013 July 1 2015 October 1 2015
February 2013 August 1 2015 November 1 2015
March 2013 September 1 2015 December 1 2015
April 2013 October 1 2015 January 1 2016
May 2013 November 1 2015 February 1 2016
June 2013 December 1 2015 March 1 2016
July 2013 January 1 2016 April 1 2016
August 2013 February 1 2016 May 1 2016
September 2013 March 1 2016 June 1 2016
October 2013 April 1 2016 July 1 2016
November 2013 May 1 2016 August 1 2016
December 2013 June 1 2016 September 1 2016
Regular Chronic Dialysis Began (RCBD) /
First Date of Dialysis Ever (FDODE)
For a complete Reference Chart for dates from
January 2005 – December 2021 ,
COB Reference Chart
2013