Dr William P Carter Iii, MD - Medicare Emergency Medicine in Portsmouth, NH

Dr William P Carter Iii, MD is a medicare enrolled "Emergency Medicine" physician in Portsmouth, New Hampshire. He graduated from medical school in 2005 and has 19 years of diverse experience with area of expertise as Emergency Medicine. His current practice location is 333 Borthwick Ave, Portsmouth, New Hampshire. You can reach out to his office (for appointments etc.) via phone at (603) 436-5110.

Dr William P Carter Iii is licensed to practice in New Hampshire (license number 13946) and he also participates in the medicare program. He accepts medicare assignments (which means he accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and his NPI Number is 1083795116.

Contact Information

Dr William P Carter Iii, MD
333 Borthwick Ave,
Portsmouth, NH 03801-7128
(603) 436-5110
Not Available

Map and Direction




Physician's Profile

Full NameDr William P Carter Iii
GenderMale
SpecialityEmergency Medicine
Experience19 Years
Location333 Borthwick Ave, Portsmouth, New Hampshire
Accepts Medicare AssignmentsYes. He accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Dr William P Carter Iii graduated from medical school in 2005
  NPI Data:
  • NPI Number: 1083795116
  • Provider Enumeration Date: 10/17/2006
  • Last Update Date: 02/21/2023
  Medicare PECOS Information:
  • PECOS PAC ID: 3375610306
  • Enrollment ID: I20080917000410

Medical Identifiers

Medical identifiers for Dr William P Carter Iii such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1083795116NPI-NPPES
30207888MedicaidNH
110082238AMedicaidMA
1083795116OtherNHANTHEM BCBS
P00648240OtherNHRAILROAD MEDICARE
432976099MedicaidME
AA121001OtherNHHARVARD

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207P00000XEmergency Medicine 13946 (New Hampshire)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Frisbie Memorial HospitalRochester, NHHospital
Portsmouth Regional HospitalPortsmouth, NHHospital
Wentworth-douglass HospitalDover, NHHospital

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Dr William P Carter Iii allows following entities to bill medicare on his behalf.
Entity NameSeacoast Wound Care Pllc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1255039020
PECOS PAC ID: 5698140978
Enrollment ID: O20230419001572
Entity NameEmergency Medicine Services Of Nh, Llc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1386341444
PECOS PAC ID: 3173988474
Enrollment ID: O20230419002879

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Dr William P Carter Iii is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Dr William P Carter Iii, MD
330 Borthwick Ave,
Portsmouth, NH 03801-4174

Ph: (603) 436-5110
Dr William P Carter Iii, MD
333 Borthwick Ave,
Portsmouth, NH 03801-7128

Ph: (603) 436-5110

Reviews and Comments


Emergency Medicine Doctors in Portsmouth, NH

Samuel W Trotzky, MD
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 333 Borthwick Ave, Portsmouth, NH 03801
Phone: 603-433-4012    Fax: 603-433-5184
Steven J Bos, MD
Emergency Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 333 Borthwick Ave, Portsmouth, NH 03801
Phone: 603-433-4012    Fax: 603-433-5184
Samantha Arnold,
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 333 Borthwick Ave, Portsmouth, NH 03801
Phone: 603-674-9496    
Alexandra Loomis, DO
Emergency Medicine
Medicare: Medicare Enrolled
Practice Location: 333 Borthwick Ave Ste 100, Portsmouth, NH 03801
Phone: 617-763-1295    
Harry Joseph Wallus, D.O.
Emergency Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 333 Borthwick Ave, Portsmouth, NH 03801
Phone: 603-433-4012    Fax: 603-433-5184
Dr. Brian Christopher Collins, D.O.
Emergency Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 73 Corporate Dr, Suite 100, Portsmouth, NH 03801
Phone: 603-610-8051    

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

Our Data: Information on www.medicarelist.com is built using data sources published by Centers for Medicare & Medicaid Services (CMS) under Freedom of Information Act (FOIA). The information disclosed on the NPI Registry are FOIA-disclosable and are required to be disclosed under the FOIA and the eFOIA amendments to the FOIA. There is no way to 'opt out' or 'suppress' the NPPES record data for health care providers with active NPIs.