Grant Michael Wallenfelsz, MD - Medicare Emergency Medicine in Agana Heights, GU

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Grant Michael Wallenfelsz, MD is a medicare enrolled "Emergency Medicine" physician in Agana Heights, Guam. His current practice location is Bldg #50 Farenholt Ave, Agana Heights, Guam. You can reach out to his office (for appointments etc.) via phone at (671) 344-9340.

Grant Michael Wallenfelsz is licensed to practice in Texas (license number T3715) and he also participates in the medicare program. He does not accept medicare assignments directly but he may accept medicare through third-party (refer to Reassignment section below) and may also prescribe medicare part D drugs. His NPI Number is 1194353318.

Contact Information

Grant Michael Wallenfelsz, MD
Bldg #50 Farenholt Ave,
Agana Heights, GU 96910
(671) 344-9340
Not Available

Map and Direction




Physician's Profile

Full NameGrant Michael Wallenfelsz
GenderMale
SpecialityEmergency Medicine
LocationBldg #50 Farenholt Ave, Agana Heights, Guam
Accepts Medicare AssignmentsMedicare enrolled and may accept medicare through third-party reassignment. May prescribe medicare part D drugs.
  NPI Data:
  • NPI Number: 1194353318
  • Provider Enumeration Date: 04/01/2020
  • Last Update Date: 10/02/2025
  Medicare PECOS Information:
  • PECOS PAC ID: 9335671106
  • Enrollment ID: I20241017002667

Medical Identifiers

Medical identifiers for Grant Michael Wallenfelsz such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1194353318NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207P00000XEmergency Medicine T3715 (Texas)Primary
207P00000XEmergency Medicine A187218 (California)Secondary
207P00000XEmergency Medicine M-2480 (Guam)Secondary

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. Grant Michael Wallenfelsz allows following entities to bill medicare on his behalf.
Entity NameCep America - California
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1548667843
PECOS PAC ID: 6103739131
Enrollment ID: O20040121000458

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. Grant Michael Wallenfelsz 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
Grant Michael Wallenfelsz, MD
Psc 455 Box 208,
Fpo, AP 96540-0003

Ph: () -		Grant Michael Wallenfelsz, MD
Bldg #50 Farenholt Ave,
Agana Heights, GU 96910

Ph: (671) 344-9340

Reviews and Comments


Emergency Medicine Doctors in Agana Heights, GU

Mallori Marie Wilson,
Emergency Medicine
Medicare: Medicare Enrolled
Practice Location: U.s. Naval Hospital Guam, Agana Heights, GU 96910
Phone: 671-344-9340    
Dr. Thomas C Baugh, D.O.
Emergency Medicine
Medicare: Medicare Enrolled
Practice Location: U.s. Naval Hospital Guam, Farenholt Street, Building K-1, Agana Heights, GU 96919
Phone: 671-344-9232    
Dr. Alexander Janson Salazar, M.D.
Emergency Medicine
Medicare: Medicare Enrolled
Practice Location: Farenholt Ave, Bldg 50, Agana Heights, GU 96910
Phone: 671-344-9232    
Dr. Christopher Boyd Chisholm, MD
Emergency Medicine
Medicare: Not Enrolled in Medicare
Practice Location: Us Naval Hospital Guam, Farenholt Ave Bld K1, Agana Heights, GU 96919
Phone: 671-344-9619    
Dr. John T Haggerty, D.O.
Emergency Medicine
Medicare: Medicare Enrolled
Practice Location: Bldg 50, Farenholt Ave, Agana Heights, GU 96910
Phone: 671-344-9340    
Daniel Rupert Neren, MD
Emergency Medicine
Medicare: Medicare Enrolled
Practice Location: U.s. Naval Hospital Guam, Bldg 50, Farenholt Ave, Agana Heights, GU 96910
Phone: 671-344-9340    

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.