Sisselman Medical Group, PC
NPI 1851572358 · Internal Medicine Physician · Massapequa, NY
Enrolled with Medicare as Part B Supplier - Clinic/Group Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Sisselman Medical Group, PC is a Internal Medicine Physician organization in Massapequa, NY (NPI 1851572358).
Provider details
- NPI number
- 1851572358
- Entity type
- Organization
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Stephen Sisselman, President(516) 308-4040
- License
- 216154 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
18 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-11-26
- Last updated
- 2022-10-12
- Certified
- 2022-10-12
Frequently asked questions
- What is Sisselman Medical Group, PC's NPI number?
- Sisselman Medical Group, PC's National Provider Identifier (NPI) is 1851572358, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Sisselman Medical Group, PC?
- Sisselman Medical Group, PC is classified in the NPPES registry as Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Sisselman Medical Group, PC located?
- Sisselman Medical Group, PC's practice location on file with NPPES is 627 Broadway, Massapequa, NY 11758-5031.
- What is Sisselman Medical Group, PC's phone number?
- The practice phone number listed in the NPPES registry for Sisselman Medical Group, PC is (516) 308-4040.
- Does Sisselman Medical Group, PC accept Medicare?
- Sisselman Medical Group, PC is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Who is the authorized official for Sisselman Medical Group, PC?
- The authorized official listed on Sisselman Medical Group, PC's NPPES record is Stephen Sisselman, President. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Sisselman Medical Group, PC's NPI active?
- Yes — Sisselman Medical Group, PC's NPI (1851572358) is active in the NPPES registry as of the last update on 2022-10-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.