Additional Description - The 5010 professional claim transaction (837P) requires that when a non-specific or Not Otherwise Classified (NOC) procedure code is used (in the 2400/SV101-2), then a description is required in the 2400/SV101-7.  

Here’s the link to the NOC codes list from CMS: http://www.cms.gov/Medicare/Billing/ElectronicBillingEDITrans/Downloads/CMSNOCCodes.zip

Here’s the main link--once here you can scroll to the bottom to get to the zip file that has all the codes: http://www.cms.gov/Medicare/Billing/ElectronicBillingEDITrans/FFSEditing.html