Marc N. Sperber, DDS & Joseph Portnoy, DDS, LLC
NPI 1861567166 · General Practice Dentistry · Lindenhurst, NY
Marc N. Sperber, DDS & Joseph Portnoy, DDS, LLC is a General Practice Dentistry organization in Lindenhurst, NY (NPI 1861567166).
Provider details
- NPI number
- 1861567166
- Entity type
- Organization
- Primary specialty
- General Practice DentistryDental Providers
- Organization subpart
- No
- Authorized official
- Marc Sperber, Owner(631) 226-5252
Specialties & taxonomies
Dental Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 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
- 2006-11-21
- Last updated
- 2008-06-19
Frequently asked questions
- What is Marc N. Sperber, DDS & Joseph Portnoy, DDS, LLC's NPI number?
- Marc N. Sperber, DDS & Joseph Portnoy, DDS, LLC's National Provider Identifier (NPI) is 1861567166, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Marc N. Sperber, DDS & Joseph Portnoy, DDS, LLC?
- Marc N. Sperber, DDS & Joseph Portnoy, DDS, LLC is classified in the NPPES registry as General Practice Dentistry (Dental Providers).
- Where is Marc N. Sperber, DDS & Joseph Portnoy, DDS, LLC located?
- Marc N. Sperber, DDS & Joseph Portnoy, DDS, LLC's practice location on file with NPPES is 266 East Sunrise Highway, Lindenhurst, NY 11757-2516.
- What is Marc N. Sperber, DDS & Joseph Portnoy, DDS, LLC's phone number?
- The practice phone number listed in the NPPES registry for Marc N. Sperber, DDS & Joseph Portnoy, DDS, LLC is (631) 226-5252.
- Who is the authorized official for Marc N. Sperber, DDS & Joseph Portnoy, DDS, LLC?
- The authorized official listed on Marc N. Sperber, DDS & Joseph Portnoy, DDS, LLC's NPPES record is Marc Sperber, Owner. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Marc N. Sperber, DDS & Joseph Portnoy, DDS, LLC's NPI active?
- Yes — Marc N. Sperber, DDS & Joseph Portnoy, DDS, LLC's NPI (1861567166) is active in the NPPES registry as of the last update on 2008-06-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.