Lonnie Seo
Emergency Medicine Physician · New Haven, CT
Lonnie Seo is an emergency medicine physician with a practice address in New Haven, Connecticut, and NPI 1740785211, issued on Mar 27, 2018. Check the license (Connecticut 67025, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Lonnie Seo
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 67025 CT
Self-reported in NPPES; status is on the state search - Practice location
- 464 Congress Ave Ste 260, New Haven, CT 06519
- Phone
- (203) 737-2644
- Enumerated
- Mar 27, 2018
- Record last updated
- Apr 14, 2022
- Medicare enrollment
- Enrolled (PECOS I20220425000810); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 846 in Connecticut → Look up another NPI →
Also registered at 464 Congress Ave Ste 260
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Sean Bush, M.D.Emergency Medicine Physician1184739872
- Mikaela Coady, PA-CMedical Physician Assistant1528665197
- Katherine Couturier, M.D., M.P.H.Emergency Medicine Physician1669768115
- Aisha Droz Lopez, MDEmergency Medicine Physician1154893766
- Daniel Goldberg, PA-CPhysician Assistant1710590807
- Meghan Gwara, PA-CMedical Physician Assistant1023634565
Verify Lonnie Seo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 67025Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
12% more Medicare Part D claims than the average emergency medicine physician in 2024
253 Medicare Part D claims for 192 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 11 claims were for opioids.
Most prescribed
- Cephalexin43 claims
- Prednisone25 claims
- Ondansetron Odt21 claims
- Amoxicillin-Clavulanate Potass14 claims
- Gabapentin11 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 one group practice
- Emergency Medicine Physicians OF Fairfield County LLCStamford, CT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Lonnie Seo among 846 emergency medicine physician records in Connecticut
Lonnie Seo is one of 846 emergency medicine physician records with a practice address in Connecticut. 86% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 79% of them.
- NPI issued2018 · 79% of these records are older, 17% newer
- In a Medicare fileYes · 86% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated2018 · median 2011 among the 574 with a school on file
- Record last updated2022 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
204 emergency medicine physician records list a practice address in New Haven
They are 204 of the 9,793 NPPES records with a practice address in New Haven, and 846 emergency medicine physician records in Connecticut.
All 846 in Connecticut → Every provider in New Haven → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Mary Bogucki, MDNew Haven, CT 065191053392621
- Sean Bush, M.D.New Haven, CT 065191184739872
- Alexandra Carter, MDNew Haven, CT 065191407983190
- David Della-Giustina, MDNew Haven, CT 065191952366437
- Alyssa French, MDNew Haven, CT 065191407918709
- Barbara Kirrane, MDNew Haven, CT 065191710073713
- Gregory Larkin, MDNew Haven, CT 065191205890084
- Michael Lyons, MDNew Haven, CT 065191790712172
Common questions
What is Lonnie Seo's NPI number?
Lonnie Seo's National Provider Identifier (NPI) is 1740785211, issued on Mar 27, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Lonnie Seo located?
The NPPES record lists a practice address at 464 Congress Ave Ste 260, New Haven, CT, 06519. Phone: (203) 737-2644. Providers update this record themselves, so call before visiting.
How can I verify Lonnie Seo's license?
NPPES lists Connecticut license number 67025, 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 Lonnie Seo prescribe under Medicare Part D?
In 2024, Lonnie Seo had 253 Medicare Part D claims for 192 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.