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

Peter John Drennan, DO

Individual provider Internal Medicine Physician · NPI 1629043625

Peter John Drennan, DO practises Internal Medicine in Enfield, Connecticut. Graduated from University of New England, College of Osteo Medicine in 1983, 43 years ago. Practices with Baystate Medical Practices Inc, a 1,346-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Connecticut and Massachusetts.

Years since qualifying
43
Trained at
University of New England, College of Osteo Medicine
Licensed in
CT, MA
In the registry since
2006
Specialties on file
2
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

701 Enfield St
Enfield, CT 06082-2961
Phone: (860) 741-6058
Fax: (413) 733-5860
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 64560 (CT)
Internal Medicine Physician Taxonomy 207R00000X · Licence 54104 (MA)

Record details

NPI number1629043625
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedFebruary 22, 2006
Last updated in NPPESMay 11, 2026
Certification dateMay 11, 2026

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolUNIVERSITY OF NEW ENGLAND, COLLEGE OF OSTEO MEDICINE
Graduated 1983 (43 years in practice)
Group practice Baystate Medical Practices Inc — 1346 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations2 on file with Medicare

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 patients282
Services billed 1,547 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. Those with a page here are linked.

  • Baystate Medical Center Hospital · Springfield, MA · listed as Baystate Medical Center Inc
  • Baystate Wing Hospital Hospital · Palmer, MA · listed as Baystate Wing Hospital Corporation
  • Mercy Medical Ctr Hospital · Springfield, MA · listed as The Mercy Hospital Inc
  • Amedisys Home Health Care Home health agency · Agawam, MA
  • Baystate Home Health Home health agency · W Springfield, MA
  • Encompass Health Home Health Home health agency · Ludlow, MA

Colleagues at Baystate Medical Practices Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1346 clinicians in the practice; 12 are shown here.

Other providers in Enfield