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

Dr. Jaionn Zavier Griner, MD

Individual provider Student in an Organized Health Care Education/Training Program · NPI 1801423553

Dr. Jaionn Zavier Griner, MD practises Emergency Medicine in Boston, Massachusetts. Graduated from University of California, Geffen School of Medicine in 2020, 6 years ago. Practices with Longhorn Emergency Medical Associates PA, a 148-clinician group and accepts Medicare assignment. Licensed in Texas.

Years since qualifying
6
Trained at
University of California, Geffen School of Medicine
Licensed in
TX
In the registry since
2020
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

Student / training record This NPI belongs to someone enrolled in a health care training programme. It carries no licence and no practice of its own, so no address or phone number is published for it.

Boston, MA

No coordinates on file. Search this address in Google Maps

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence V2744 (TX)
Student in an Organized Health Care Education/Training Program Taxonomy 390200000X

Record details

NPI number1801423553
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 24, 2020
Last updated in NPPESAugust 2, 2024
Certification dateAugust 2, 2024

Medicare enrollment

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

Medicare specialtyEMERGENCY MEDICINE
Medical schoolUNIVERSITY OF CALIFORNIA, GEFFEN SCHOOL OF MEDICINE
Graduated 2020 (6 years in practice)
Group practice Longhorn Emergency Medical Associates Pa — 148 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients89
Services billed 101 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Colleagues at Longhorn Emergency Medical Associates PA

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 148 clinicians in the practice; 12 are shown here.

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