Michelle Hammer, NP

NPI 1225169584 · on the registry since 2007

Practice

Address: 122 W 27th St
6th Floor
New York, NY 10001
Phone: (212) 691-2900
Organisation at this address: Greenwich House Inc
Katherine Mazza Psychotherapy
Greenwich House Chemical Dependency Program
Inferred from a shared address, not stated in the registry.
Clinicians at this address: 17

Registry record

Primary taxonomy: 363LG0600X
363LG0600X
Also registered as: Psychiatric/Mental Health Nurse Practitioner
Licence states on file: NY
From the registry's licence fields, which are often incomplete.
Sex: Female
Record last updated: 2025-09-11

Source: CMS National Plan and Provider Enumeration System. Registration is not the same as practising, and the registry records no retirement — some people listed here no longer practise. More in New York