Mark Leslie Gaynor, LCSW
Clinical Social Worker · New Haven, CT
Mark Leslie Gaynor, LCSW is a clinical social worker with a practice address in New Haven, Connecticut, and NPI 1275515009, issued on Nov 17, 2005. Check the license (Connecticut 000930, as entered in NPPES) with the Connecticut board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Mark Leslie Gaynor
- Credential
- LCSW
- Primary taxonomy
- Clinical Social Worker 1041C0700X
- License number
- 000930 CT
Self-reported in NPPES; status is on the state search - Practice location
- 100 Whitney Ave, New Haven, CT 06510
- Phone
- (203) 865-0865
- Enumerated
- Nov 17, 2005
- Record last updated
- Jun 27, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (203) 865-0093
- Medicare enrollment
- Enrolled (PECOS I20050505000641); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest clinical social worker records → All 7,729 in Connecticut → Look up another NPI →
Also registered at 100 Whitney Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Lisa Cross, PH.D.Clinical Psychologist1205138732
Verify Mark Leslie Gaynor in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Connecticut board licenses this profession
Search for license 000930Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Mark Leslie Gaynor among 7,729 clinical social worker records in Connecticut
Mark Leslie Gaynor, LCSW is one of 7,729 clinical social worker records with a practice address in Connecticut. 15% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, over 99% newer
- In a Medicare fileNo · 15% of these records are
- In the CMS Doctors and Clinicians fileYes · 23% of these records are
- Graduated1975 · median 2009 among the 1,784 with a school on file
- Record last updated2018 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 1041C0700X and a Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
556 clinical social worker records list a practice address in New Haven
They are 556 of the 9,793 NPPES records with a practice address in New Haven, and 7,729 clinical social worker records in Connecticut. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 7,729 in Connecticut → Every provider in New Haven → Clinical Social Worker nationwide →
The 8 clinical social worker records with the nearest ZIP codes
- Carol Charkow, MSWNew Haven, CT 065101235279514
- John Clow, MSWNew Haven, CT 065101023107034
- Laurie Depaola, L.C.S.W.New Haven, CT 065101689898892
- Barbara Dinesen, L.C.S.W.02New Haven, CT 065101811094170
- Carrie Erwin, LCSWNew Haven, CT 065101699899963
- Beth Klink, LCSWNew Haven, CT 065101457387219
- Danielle Knox, LCSWNew Haven, CT 065101033291448
- Donna Lafleur, LCSW, LICSWNew Haven, CT 065101437264439
Common questions
What is Mark Leslie Gaynor, LCSW's NPI number?
Mark Leslie Gaynor, LCSW's National Provider Identifier (NPI) is 1275515009, issued on Nov 17, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Mark Leslie Gaynor, LCSW located?
The NPPES record lists a practice address at 100 Whitney Ave, New Haven, CT, 06510. Phone: (203) 865-0865. Providers update this record themselves, so call before visiting.
How can I verify Mark Leslie Gaynor, LCSW's license?
NPPES lists Connecticut license number 000930, as entered by the provider. Search the Connecticut board that licenses this profession; the NPPES record confirms identity only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.