Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

William Michael Day, MSW

Individual provider Social Worker · NPI 1184934309

William Michael Day, MSW is a Social Worker in New York, New York. Registered with an NPI since 2010.

In the registry since
2010
What do these letters mean?
MSW — Master of Social Work
The graduate degree in social work.

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Practice location Address checks out

423 E 23rd St
New York, NY 10010-5011 Not confirmed with CMS for 15 years — call before visiting
Phone: (212) 686-7500
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Social Worker (primary) Taxonomy 104100000X

Record details

NPI number1184934309
Entity typeIndividual (Type 1)
GenderMale
Credentials MSW
Sole proprietorNo
NPI enumeratedOctober 21, 2010
Last updated in NPPESOctober 21, 2010

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