Dr.john J. Mark and Dr. Judith L. Mark LLP
NPI 1285948752 · Family Medicine Physician · North Merrick, NY
Dr.john J. Mark and Dr. Judith L. Mark LLP is a Family Medicine Physician organization in North Merrick, NY (NPI 1285948752).
Provider details
- NPI number
- 1285948752
- Entity type
- Organization
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Nancy Skelton, Biller(516) 997-0876
- License
- 147046 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
16 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
- 2010-07-27
- Last updated
- 2010-07-27
Frequently asked questions
- What is Dr.john J. Mark and Dr. Judith L. Mark LLP's NPI number?
- Dr.john J. Mark and Dr. Judith L. Mark LLP's National Provider Identifier (NPI) is 1285948752, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Dr.john J. Mark and Dr. Judith L. Mark LLP?
- Dr.john J. Mark and Dr. Judith L. Mark LLP is classified in the NPPES registry as Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Dr.john J. Mark and Dr. Judith L. Mark LLP located?
- Dr.john J. Mark and Dr. Judith L. Mark LLP's practice location on file with NPPES is 951 Merrick Ave, North Merrick, NY 11566-1001.
- What is Dr.john J. Mark and Dr. Judith L. Mark LLP's phone number?
- The practice phone number listed in the NPPES registry for Dr.john J. Mark and Dr. Judith L. Mark LLP is (516) 489-6433.
- Who is the authorized official for Dr.john J. Mark and Dr. Judith L. Mark LLP?
- The authorized official listed on Dr.john J. Mark and Dr. Judith L. Mark LLP's NPPES record is Nancy Skelton, Biller. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Dr.john J. Mark and Dr. Judith L. Mark LLP's NPI active?
- Yes — Dr.john J. Mark and Dr. Judith L. Mark LLP's NPI (1285948752) is active in the NPPES registry as of the last update on 2010-07-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.