DR. LAWRENCE TSE SIEW M.D.
NPI 1891933727
Pediatrics - Pediatric Emergency Medicine in New Haven, CT
About Dr. Lawrence Tse Siew M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. LAWRENCE TSE SIEW M.D. (NPI 1891933727) is an individual pediatric emergency medicine provider in New Haven, Connecticut, licensed in Connecticut (050576) and active in the NPI registry since January 2009. He is enrolled in Medicare PECOS and is a graduate of Rutgers New Jersey Medical School (2005).
NPPES Registry Identity
Specialties & Licenses 2
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Lawrence Tse Siew M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Lawrence Siew reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
New Haven, CT 06519
- Reassigned Medicare billing, Connecticut enrollment
- 3,728 clinicians in this Medicare group
New London, CT 06320
- Reassigned Medicare billing, Connecticut enrollment
- 65 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Other Providers at the Same Location NPPES 2
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
NEW HAVEN, CT 06511
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Lawrence Siew's NPI number?
The NPI number for Lawrence Siew is 1891933727. It was assigned to this individual provider in the NPPES registry on January 30, 2009.
Where is Lawrence Siew located?
Lawrence Siew practices at 100 York St Ste 1F, New Haven, CT 06511. The listed phone number is (203) 737-7445.
What is Lawrence Siew's specialty?
The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Emergency Medicine, with taxonomy code 2080P0204X.
Is Lawrence Siew enrolled in Medicare?
Yes. Lawrence Siew is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Lawrence Siew's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Lawrence Siew reassigns Medicare benefits to 2 organizations: Yale University (New Haven, CT) and Lawrence And Memorial Hospital, Inc. (New London, CT). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Lawrence Siew's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Lawrence Siew was last updated on June 29, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Lawrence Tse Siew, M.D. · NPI 1891933727
Pediatric Emergency Medicine physician in New Haven, Connecticut. Individual provider, active in the CMS NPPES registry since January 30, 2009.
## Identity
- **NPI:** 1891933727 (Entity type: Individual)
- **Enumerated:** January 30, 2009
- **Primary specialty:** Pediatrics - Pediatric Emergency Medicine · taxonomy 2080P0204X
- **State license:** 050576 (Connecticut)
- **Sole proprietor:** No
## Practice location
- **Address:** 100 YORK ST STE 1F, New Haven, CT 06511-5664
- **Phone:** (203) 737-7445
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Yale University (NPI 1124148887, New Haven, CT); Lawrence And Memorial Hospital, Inc. (NPI 1073530879, New London, CT) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Rutgers New Jersey Medical School, class of 2005
## Record status
- **NPPES last updated:** June 29, 2012
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Source: [NPI Profile](https://npiprofile.com/npi/1891933727) · Data from the CMS NPPES public registry.