Peter John Drennan, D.O.
Internal Medicine Physician · Enfield, CT
Peter John Drennan, D.O. is an internal medicine physician with a practice address in Enfield, Connecticut, and NPI 1629043625, issued on Feb 22, 2006. Check the license (Connecticut 64560, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Peter John Drennan
- Credential
- D.O.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 64560 CT
54104 MA
Self-reported in NPPES; status is on the state search - Practice location
- 701 Enfield St, Enfield, CT 06082
- Phone
- (860) 741-6058
- Enumerated
- Feb 22, 2006
- Record last updated
- May 11, 2026
- Fax
- (413) 733-5860
- Medicaid IDs
- 110051774A MA
003116242 CT
64994127 MA - Medicare enrollment
- Enrolled (PECOS I20200129002591); accepts Medicare assignment
- Medical or professional school
- University Of New England, College Of Osteo Medicine, 1983
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,623 in Connecticut → Look up another NPI →
Also registered at 701 Enfield St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- John Bedford, M.D.Internal Medicine Physician1912965542
- Cailyn Bolduc, PA-CMedical Physician Assistant1215748355
- Patrick Gibson, PA-C, MHPMedical Physician Assistant1861406597
- Izabela Krakowiak Colasacco, D.O.Internal Medicine Physician1972795102
- Karen Krustapentus, APRN, BCNurse Practitioner1285660860
- Francis Murray, M.D.Internal Medicine Physician1528026499
Verify Peter John Drennan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 64560Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% more Medicare Part D claims than the average internal medicine physician in 2024
6,218 Medicare Part D claims for 452 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 153 claims were for opioids.
Most prescribed
- Atorvastatin Calcium517 claims
- Lisinopril358 claims
- Amlodipine Besylate317 claims
- Rosuvastatin Calcium252 claims
- Omeprazole221 claims
- Levothyroxine Sodium136 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through 2 group practices
- Baystate Medical Practices IncEnfield, CT
- Springfield Medical Associates, Inc.Enfield, CT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Peter John Drennan among 2,623 internal medicine physician records in Connecticut
Peter John Drennan, D.O. is one of 2,623 internal medicine physician records with a practice address in Connecticut. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 11% of them.
- NPI issued2006 · 11% of these records are older, 52% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1983 · median 2004 among the 1,646 with a school on file
- Record last updated2026 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
17 internal medicine physician records list a practice address in Enfield
They are 17 of the 989 NPPES records with a practice address in Enfield, and 2,623 internal medicine physician records in Connecticut.
All 2,623 in Connecticut → Every provider in Enfield → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- John Bedford, M.D.Enfield, CT 060821912965542
- Joseph Breton, M.DEnfield, CT 060821932206232
- Miriam Buckberg, MDEnfield, CT 060821578549010
- George Donahue, MDEnfield, CT 060821710964325
- Marat Gitman, DOEnfield, CT 060821396907069
- Izabela Krakowiak Colasacco, D.O.Enfield, CT 060821972795102
- Francis Murray, M.D.Enfield, CT 060821528026499
- Darren O'Neill, M.D.Enfield, CT 060821861434607
Common questions
What is Peter John Drennan, D.O.'s NPI number?
Peter John Drennan, D.O.'s National Provider Identifier (NPI) is 1629043625, issued on Feb 22, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Peter John Drennan, D.O. located?
The NPPES record lists a practice address at 701 Enfield St, Enfield, CT, 06082. Phone: (860) 741-6058. Providers update this record themselves, so call before visiting.
How can I verify Peter John Drennan, D.O.'s license?
NPPES lists Connecticut license number 64560, as entered by the provider. Search the Connecticut Medical Examining Board at https://www.elicense.ct.gov/Lookup/LicenseLookup.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Peter John Drennan, D.O. prescribe under Medicare Part D?
In 2024, Peter John Drennan, D.O. had 6,218 Medicare Part D claims for 452 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.