SISSELMAN MEDICAL GROUP, PC
NPI 1851572358
Internal Medicine in Massapequa, NY
About Sisselman Medical Group, Pc NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
SISSELMAN MEDICAL GROUP, PC (NPI 1851572358) is a healthcare organization registered as an internal medicine in Massapequa, New York and active in the NPI registry since November 2007. The organization holds a CLIA Waiver certificate valid through March 26, 2027 and lists Stephen Sisselman, President, as its authorized official.
NPPES Registry Identity
Specialties & Licenses 2
Other Identifiers 1
Group Practice 1
Medicare Participation & PECOS CMS
Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Sisselman Medical Group, Pc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
4Medicare enrollment records show 4 clinicians reassign Medicare billing to Sisselman Medical Group, PC, which bills Medicare for the services they deliver. Of these, 2 practice at this address and 3 within 10 miles. They are listed nearest first.
Clinicians, nearest first (4)
New Hyde Park, NY 11040
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
CLIA Laboratory Certificates CMS CLIA
Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.
Certificate of Waiver 33D1079653
Sisselman Medical Group - Massapequa · Massapequa, NYFrequently 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 Sisselman Medical Group, PC's NPI number?
The NPI number for Sisselman Medical Group, PC is 1851572358. It was assigned to this organization in the NPPES registry on November 26, 2007.
Where is Sisselman Medical Group, PC located?
Sisselman Medical Group, PC is located at 627 Broadway Suite 1, Massapequa, NY 11758. The listed phone number is (516) 308-4040.
What is Sisselman Medical Group, PC's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Sisselman Medical Group, PC enrolled in Medicare?
Yes. Sisselman Medical Group, PC is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through Sisselman Medical Group, PC?
According to the CMS Revalidation Reassignment List (October 2026 release), 4 clinicians reassign their Medicare billing to Sisselman Medical Group, PC, in Family Practice, Internal Medicine and Nurse Practitioner. A 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 the clinician's services. Of these, 2 practice at this address and 3 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Does Sisselman Medical Group, PC hold a CLIA laboratory certificate?
Yes. A Certificate of Waiver (number 33D1079653) is associated with this NPI, valid through March 26, 2027. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.
When was this NPI record last updated?
The NPPES record for Sisselman Medical Group, PC was last updated on October 12, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Sisselman Medical Group, Pc · NPI 1851572358
Internal Medicine organization in Massapequa, New York. Organization record, active in the CMS NPPES registry since November 26, 2007.
## Identity
- **NPI:** 1851572358 (Entity type: Organization)
- **Enumerated:** November 26, 2007
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **Organization subpart:** No
- **Authorized official:** Stephen Sisselman, PRESIDENT
## Practice location
- **Address:** 627 BROADWAY, SUITE 1, Massapequa, NY 11758-5031
- **Phone:** (516) 308-4040 · **Fax:** (516) 804-6386
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Clinicians billing through this organization:** 4 clinicians in 3 Medicare specialties reassign Medicare billing to this organization (form CMS-855R); largest: Nurse Practitioner (2), Family Practice (1), Internal Medicine (1); 2 practice at this address and 3 within 10 miles · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** October 12, 2022
- **Other identifiers:** Medicaid 05215494 (NY)
- **CLIA laboratory certificates:** 1 on file
---
Source: [NPI Profile](https://npiprofile.com/npi/1851572358) · Data from the CMS NPPES public registry.