Dr. Willard B. Cox and Dr. Mark D. Greenstein, PA
NPI 1689718025 · General Practice Dentistry · Clinton, MD
Dr. Willard B. Cox and Dr. Mark D. Greenstein, PA is a General Practice Dentistry organization in Clinton, MD (NPI 1689718025).
Provider details
- NPI number
- 1689718025
- Entity type
- Organization
- Primary specialty
- General Practice DentistryDental Providers
- Organization subpart
- No
- Authorized official
- Mark Greenstein, Partner(301) 868-7228
- License
- MD9194 (NY)
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
- 2007-02-19
- Last updated
- 2007-11-08
Frequently asked questions
- What is Dr. Willard B. Cox and Dr. Mark D. Greenstein, PA's NPI number?
- Dr. Willard B. Cox and Dr. Mark D. Greenstein, PA's National Provider Identifier (NPI) is 1689718025, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Dr. Willard B. Cox and Dr. Mark D. Greenstein, PA?
- Dr. Willard B. Cox and Dr. Mark D. Greenstein, PA is classified in the NPPES registry as General Practice Dentistry (Dental Providers).
- Where is Dr. Willard B. Cox and Dr. Mark D. Greenstein, PA located?
- Dr. Willard B. Cox and Dr. Mark D. Greenstein, PA's practice location on file with NPPES is 7905 Malcolm Rd Ste 104, Clinton, MD 20735-1709.
- What is Dr. Willard B. Cox and Dr. Mark D. Greenstein, PA's phone number?
- The practice phone number listed in the NPPES registry for Dr. Willard B. Cox and Dr. Mark D. Greenstein, PA is (301) 868-7228.
- Who is the authorized official for Dr. Willard B. Cox and Dr. Mark D. Greenstein, PA?
- The authorized official listed on Dr. Willard B. Cox and Dr. Mark D. Greenstein, PA's NPPES record is Mark Greenstein, Partner. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Dr. Willard B. Cox and Dr. Mark D. Greenstein, PA's NPI active?
- Yes — Dr. Willard B. Cox and Dr. Mark D. Greenstein, PA's NPI (1689718025) is active in the NPPES registry as of the last update on 2007-11-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.