Wiki Billing under a Group NPI

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You don't indicate if you're asking about a CMS-1500 form or a UB-04. For the 1500 form, I use this reference from our MAC: https://www.cgsmedicare.com/pdf/5010_jobaid.pdf

The Line # references the block on the claim form with a cross reference to the electronic loop and segment.

Edited to post the actual web address since the original link wasn't very obvious.
 
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For the CMS-1500 the rendering provider NPI goes in box J and box 31, the provider group NPI goes in box 33a with the billing address information. If your payer requires a referring provider then the referring provider's name goes in box 17 and the referring provider's NPI goes in box 17b
 
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