Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Grant Michael Wallenfelsz, MD

Individual provider Emergency Medicine Physician · NPI 1194353318

Grant Michael Wallenfelsz, MD is an Emergency Medicine in Agana Heights, Guam. Graduated from Florida State University College of Medicine in 2020, 6 years ago. Practices with Guam Healthcare Development Incorporated, a 209-clinician group and accepts Medicare assignment. Licensed in California, Guam and Texas.

Years since qualifying
6
Trained at
Florida State University College of Medicine
Licensed in
CA, GU, TX
In the registry since
2020
Specialties on file
3
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address may be wrong

The ZIP code does not match the city and state on this record. Call before visiting.

Bldg #50 Farenholt Ave
Agana Heights, GU 96910
Phone: (671) 344-9340

No coordinates on file. Search this address in Google Maps

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence T3715 (TX)
Emergency Medicine Physician Taxonomy 207P00000X · Licence A187218 (CA)
Emergency Medicine Physician Taxonomy 207P00000X · Licence M-2480 (GU)

Record details

NPI number1194353318
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 1, 2020
Last updated in NPPESOctober 2, 2025
Certification dateOctober 2, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyEMERGENCY MEDICINE
Medical schoolFLORIDA STATE UNIVERSITY COLLEGE OF MEDICINE
Graduated 2020 (6 years in practice)
Group practice Guam Healthcare Development Incorporated — 209 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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