Lonnie Seo
NPI 1740785211 · Emergency Medicine Physician · New Haven, CT
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Lonnie Seo is a Emergency Medicine Physician provider in New Haven, CT (NPI 1740785211).
Provider details
- NPI number
- 1740785211
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Sex
- Female
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
8 yrs in NPPES registry
- Profile completeness28% of score
83% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
664 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Emergency Department Visit With High Level of Medical Decision Making99285 | 302 | $178 |
| Critical Care, First 30-74 Minutes99291 | 148 | $213 |
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 119 | $124 |
| Emergency Department Visit With Low Level of Medical Decision Making99283 | 43 | $73 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 15 | $67 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 14 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 5 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Cephalexin | 43 | 42 |
| Prednisone | 25 | 24 |
| Ondansetronbrand: Ondansetron Odt | 21 | 21 |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 14 | 14 |
| Gabapentin | 11 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Additional practice locations (1)
- 1 Hospital PlzStamford, CT 06902-3602Phone: (201) 658-2042
Registry dates
- Enumerated
- 2018-03-27
- Last updated
- 2022-04-14
- Certified
- 2022-04-14
Frequently asked questions
- What is Lonnie Seo's NPI number?
- Lonnie Seo's National Provider Identifier (NPI) is 1740785211, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Lonnie Seo's specialty?
- Lonnie Seo is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Lonnie Seo located?
- Lonnie Seo's practice location on file with NPPES is 464 Congress Ave Ste 260, New Haven, CT 06519-1362.
- What is Lonnie Seo's phone number?
- The practice phone number listed in the NPPES registry for Lonnie Seo is (203) 737-2644.
- Does Lonnie Seo accept Medicare?
- Lonnie Seo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Lonnie Seo's NPI active?
- Yes — Lonnie Seo's NPI (1740785211) is active in the NPPES registry as of the last update on 2022-04-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.