Claims Submitted with Only a National Provider Identifier (NPI) during the Stage 2 NPI Transition Period
Remember, during the Stage 2 NPI transition period you should submit both NPIs and legacy provider numbers on your Medicare claims to ensure that claims are properly processed. During this period, claims submitted with only an NPI that Medicare systems are unable to properly match with a legacy number (e.g., PIN, OSCAR number) may be rejected and you will be required to resubmit the claim with the appropriate legacy number.
You should make sure, when submitting Medicare claims with dates of service on or after October 1, 2006, your billing staff submit both your NPI and legacy provider numbers until further notice from CMS.
To read this article in its entirety please visit the CMS Website at:
http://www.cms.hhs.gov/mlnmattersarticles/downloads/mm5378.pdf 
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NPI numbers should be submitted in all applicable loops in the NM108-NM109. The NM108 should contain the qualifier XX followed by the NM109 NPI number.
To review the HIPAA electronic claim submission requirements visit the website by
clicking here. 127KB
If you have any questions, please contact the EDI Hotline for IL/MI/WI (877) 567-7261
For Minnesota, please contact (952) 885-2882, (952) 885-2881or (952) 885-2811
