Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
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John Chretien, MD

Individual provider Emergency Medicine Physician · NPI 1841390556

John Chretien, MD practises Emergency Medicine in Nashua, New Hampshire. Graduated from University of Texas Medical Branch at Galveston in 1997, 29 years ago. Practices with Emergency Medicine Associates PA, PC, a 704-clinician group and accepts Medicare assignment. Licensed in New Hampshire.

Years since qualifying
29
Trained at
University of Texas Medical Branch at Galveston
Licensed in
NH
In the registry since
2006
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

8 Prospect St
Nashua, NH 03060-3925 Not confirmed with CMS for 19 years — call before visiting
Phone: (603) 577-2500
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence 10897 (NH)

Record details

NPI number1841390556
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedSeptember 23, 2006
Last updated in NPPESJuly 8, 2007

Medicare enrollment

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

Medicare specialtyEMERGENCY MEDICINE
Medical schoolUNIVERSITY OF TEXAS MEDICAL BRANCH AT GALVESTON
Graduated 1997 (29 years in practice)
Group practice Emergency Medicine Associates P.A., P.C. — 704 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 patients210
Services billed 311 a service is one billed item, such as a visit, a test or a procedure
Average patient age76

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.

Colleagues at Emergency Medicine Associates PA, PC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 704 clinicians in the practice; 12 are shown here.

Other providers in Nashua