Mark Gaynor, LCSW
NPI 1275515009 · Clinical Social Worker · New Haven, CT
Enrolled with Medicare as Practitioner - Clinical Social Worker · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Gaynor, LCSW is a Clinical Social Worker provider in New Haven, CT (NPI 1275515009).
Provider details
- NPI number
- 1275515009
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- LCSW
- Sex
- Male
- Sole proprietor
- Yes
- License
- 000930 (CT)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 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
- 2005-11-17
- Last updated
- 2018-06-27
Frequently asked questions
- What is Mark Gaynor's NPI number?
- Mark Gaynor's National Provider Identifier (NPI) is 1275515009, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Gaynor's specialty?
- Mark Gaynor is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Mark Gaynor located?
- Mark Gaynor's practice location on file with NPPES is 100 Whitney Ave, New Haven, CT 06510.
- What is Mark Gaynor's phone number?
- The practice phone number listed in the NPPES registry for Mark Gaynor is (203) 865-0865.
- Does Mark Gaynor accept Medicare?
- Mark Gaynor is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Gaynor's NPI active?
- Yes — Mark Gaynor's NPI (1275515009) is active in the NPPES registry as of the last update on 2018-06-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.