Modifier “CS” is a new modifier that was created to identify items or services related to the treatment of illnesses, injuries, or conditions caused or exacerbated, directly or indirectly, by the 2010 oil spill in the Gulf of Mexico. As noted in Transmittal 2021 (CR 7087), contractors will accept modifier CS on all claims for such items or services for dates of service on or after April 20, 2010. The Calendar Year (CY) 2011 Healthcare Common Procedure Codes System (HCPCS) file erroneously listed modifier CS with an effective date of January 1, 2011.

If you have questions, please contact the PDAC Contact Center at (877) 735-1326 during the hours of 8:30 a.m. to 4:00 p.m. CT, Monday through Friday, or e-mail the PDAC by completing the DME PDAC Contact Form located on the PDAC website:

Published by Noridian as the PDAC, January 2011.  Republished by Palmetto GBA as the PDAC, February 2019.  Please note that links in this document were accurate at the time of original publication and may change over time and are no longer active.

Last Updated: 01/24/2011