GREGORY LUKE LARKIN MD
NPI 1205890084
Emergency Medicine in New Haven, CT
About Gregory Luke Larkin Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
GREGORY LUKE LARKIN MD (NPI 1205890084) is an individual emergency medicine provider in New Haven, Connecticut, licensed in Pennsylvania (MD050271L) and active in the NPI registry since April 2006. He is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 3
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Gregory Luke Larkin Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
15Medicare enrollment records show Gregory Larkin reassigns Medicare billing to 15 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
East Stroudsburg, PA 18301
- Reassigned Medicare billing, Pennsylvania enrollment
- Medicare enrollment name: St Lukes Physician Group Inc
- 2,851 clinicians in this Medicare group
Stroudsburg, PA 18360
- Reassigned Medicare billing, Pennsylvania enrollment
- 214 clinicians in this Medicare group
Philadelphia, PA 19118
- Reassigned Medicare billing, Pennsylvania enrollment
- 176 clinicians in this Medicare group
Philadelphia, PA 19118
- Reassigned Medicare billing, Pennsylvania enrollment
- 1,473 clinicians in this Medicare group
Limerick, PA 19468
- Reassigned Medicare billing, Pennsylvania enrollment
- 529 clinicians in this Medicare group
Pottstown, PA 19465
- Reassigned Medicare billing, Pennsylvania enrollment
- 474 clinicians in this Medicare group
West Grove, PA 19390
- Reassigned Medicare billing, Pennsylvania enrollment
- 106 clinicians in this Medicare group
Harrisburg, PA 17101
- Reassigned Medicare billing, Pennsylvania enrollment
- 209 clinicians in this Medicare group
Roaring Spring, PA 16673
- Reassigned Medicare billing, Pennsylvania enrollment
- 771 clinicians in this Medicare group
Du Bois, PA 15801
- Reassigned Medicare billing, Pennsylvania enrollment
- 168 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.
Areas of Expertise CMS Part B claims 4
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 06519 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
NEW HAVEN, CT 06519
NEW HAVEN, CT 06519
NEW HAVEN, CT 06519
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 Gregory Larkin's NPI number?
The NPI number for Gregory Larkin is 1205890084. It was assigned to this individual provider in the NPPES registry on April 17, 2006.
Where is Gregory Larkin located?
Gregory Larkin practices at 464 Congress Ave Ste 260, New Haven, CT 06519. The listed phone number is (203) 785-2353.
What is Gregory Larkin's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Gregory Larkin enrolled in Medicare?
Yes. Gregory Larkin is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Gregory Larkin's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Gregory Larkin reassigns Medicare benefits to 15 organizations: St. Luke's Physician Group, Inc. (East Stroudsburg, PA), Medexpress Urgent Care, PC - Pennsylvania (Stroudsburg, PA), Chestnut Hill Clinic Company, LLC (Philadelphia, PA), Tower Health Medical Group (Philadelphia, PA), Phoenixville Clinic Company LLC (Limerick, PA) and 10 more organizations, listed in the Medicare section above. 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 Gregory Larkin's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Gregory Larkin accept?
Health plans from CareSource list Gregory Larkin as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Gregory Larkin was last updated on February 10, 2017. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 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.
# Gregory Luke Larkin, MD · NPI 1205890084
Emergency Medicine physician in New Haven, Connecticut. Individual provider, active in the CMS NPPES registry since April 17, 2006.
## Identity
- **NPI:** 1205890084 (Entity type: Individual)
- **Enumerated:** April 17, 2006
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** MD050271L (Pennsylvania)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 464 CONGRESS AVE STE 260, New Haven, CT 06519-1361
- **Phone:** (203) 785-2353 · **Fax:** (203) 785-4580
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 15 organizations under Medicare reassignment (form CMS-855R): St. Luke's Physician Group, Inc. (NPI 1952662272, East Stroudsburg, PA); Medexpress Urgent Care, PC - Pennsylvania (NPI 1801175492, Stroudsburg, PA); Chestnut Hill Clinic Company, LLC (NPI 1285274969, Philadelphia, PA); Tower Health Medical Group (NPI 1306476924, Philadelphia, PA); Phoenixville Clinic Company LLC (NPI 1790746345, Limerick, PA); and 10 more · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** February 10, 2017
- **Other identifiers:** Medicare UPIN F23073; Medicare ID-Type Unspecified 8887M3 (TX); Medicaid 151006701 (TX)
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Source: [NPI Profile](https://npiprofile.com/npi/1205890084) · Data from the CMS NPPES public registry.