Mary Lynn Diaz, LCSW
Clinical Social Worker · Watertown, MA
Mary Lynn Diaz, LCSW is a clinical social worker with a practice address in Watertown, Massachusetts, and NPI 1801761507, issued on Oct 10, 2025. Check the license with the Massachusetts board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Mary Lynn Diaz
- Credential
- LCSW
- Primary taxonomy
- Clinical Social Worker 1041C0700X
- Practice location
- 480 Pleasant St, Watertown, MA 02472
- Phone
- (617) 272-9045
- Enumerated
- Oct 10, 2025
- Record last updated
- Oct 10, 2025
- Entity
- Type 1 · individual
8 nearest clinical social worker records → All 17,815 in Massachusetts → Look up another NPI →
Also registered at 480 Pleasant St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Melisa DorleanPsychiatric/Mental Health Nurse Practitioner1164369864
- Samantha GoldsmithMental Health Counselor1295687259
- Irina KleinermanStudent in an Organized Health Care Education/Training Program1629929427
- Sophia VitoCounselor1912885633
- Caroline Williams, LCSWClinical Social Worker1649132333
Verify Mary Lynn Diaz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Massachusetts board licenses this professionCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Mary Lynn Diaz among 17,815 clinical social worker records in Massachusetts
Mary Lynn Diaz, LCSW is one of 17,815 clinical social worker records with a practice address in Massachusetts. 8% 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 2025, is newer than 95% of them.
- NPI issued2025 · 95% of these records are older, 2% newer
- In a Medicare fileNo · 8% of these records are
- In the CMS Doctors and Clinicians fileNo · 17% of these records are
- Record last updated2025 · 68% 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 Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
100 clinical social worker records list a practice address in Watertown
They are 100 of the 873 NPPES records with a practice address in Watertown, and 17,815 clinical social worker records in Massachusetts. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 17,815 in Massachusetts → Every provider in Watertown → Clinical Social Worker nationwide →
The 8 clinical social worker records with the nearest ZIP codes
- May Chin, MSW - LICSWWatertown, MA 024721972570844
- Lori Cignarella, LICSWWatertown, MA 024721952488553
- Amy Conwell, LICSWWatertown, MA 024721083630172
- Michelle Dale, LICSWWatertown, MA 024721043384696
- Susan Falkoff, LICSWWatertown, MA 024721487713285
- Deirdre Fay, MSW, LICSWWatertown, MA 024721497813299
- Kimberly Grebert, LICSWWatertown, MA 024721831261403
- Patricia Howe, LICSWWatertown, MA 024721790868032
Common questions
What is Mary Lynn Diaz, LCSW's NPI number?
Mary Lynn Diaz, LCSW's National Provider Identifier (NPI) is 1801761507, issued on Oct 10, 2025. An NPI identifies a provider in billing; it is not a license.
Where is Mary Lynn Diaz, LCSW located?
The NPPES record lists a practice address at 480 Pleasant St, Watertown, MA, 02472. Phone: (617) 272-9045. Providers update this record themselves, so call before visiting.
How can I verify Mary Lynn Diaz, LCSW's license?
Search the Massachusetts 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.