September 15, 2025
Customer Service: Make the Most of Your Call
Beginning on October 1, 2025, Customer Service will assist one PTAN/NPI combination per call. To make the most of your call, have all authentication details ready before you dial:
- PTAN
- NPI
- Tax ID (last 5 digits)
- Beneficiary information for the claim in question:
- Last name
- First initial
- Date(s) of service
For claim-specific questions, make sure you authenticate with the exact billing PTAN associated with the claim. Beginning on October 1, we’ll ask you to call back and reauthenticate if the claim isn’t processed with the authenticated PTAN.
We encourage you to use myCGS, our secure self-service portal, to check beneficiary eligibility, claim status, and more.

