Addenda Updates

This page contains Ambulatory Surgical Center (ASC) payment related annual and quarterly ASCFS and Drug file Addenda.

Files described in the ASC annual and quarterly change request transmittals are accessible in the "Downloads" section below.

NOTICE: Please note that the payment indicators and payment rates for a number of services listed in Addenda AA and BB to the calendar year (CY) 2010 Outpatient Prospective Payment System (OPPS)/Ambulatory Surgical Center (ASC) final rule with comment period have been revised since the original posting on October 30, 2009 and re-posting on November 25, 2009.

The CY 2010 payment indicators and rates for many of the ASC services listed in Addenda AA and BB are based on the CY 2010 non-facility practice expense (PE) amounts under the Medicare Physician Fee Schedule (MPFS).  Technical corrections to several non-facility PE relative value units  and a legislative change to the CY 2010 MPFS conversion factor update required revision of several ASC payment indicators and rates that were included in the Addenda to the CY 2010 OPPS/ASC final rule with comment period and posted on this web site.

The affected ASC payment indicators and rates have been updated in the revised Addenda AA and BB to the CY 2010 OPPS/ASC final rule with comment period posted December 31, 2009 on the CMS website at:  http://www.cms.hhs.gov/ASCPayment/11_Addenda_Updates.asp

A correction notice will also be published in the Federal Register regarding these corrections.

The ASC payment indicators and rates displayed in these revised Addenda reflect a zero percent update to the MPFS conversion factor and are valid for the period January 1 through May 31, 2010.