All inquiries for billing:

Healthcare Administrative Partners.

For Healthcare Administrative services:

Call Center Number: 800-889-4447  

Patient email: Patient@medpayment.net

Billing Address: PO Box 6750 Portsmouth, NH 03802

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• With respect to NSMC and PMA services please visit the following link: Https://Pay.Instamed.com/CWR
• With respect to Merrimack Radiology and services at LGH, please visit the following link: Https://Pay.instamed.com/