Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Mary Ann Fieffer, APRN, RN

Individual provider Family Nurse Practitioner · NPI 1932147675

Mary Ann Fieffer, APRN, RN is a Family Nurse Practitioner in New Haven, Connecticut. Licensed in Connecticut. Registered with an NPI since 2006.

Licensed in
CT
In the registry since
2006
What do these letters mean?
APRN — Advanced Practice Registered Nurse
The umbrella licence covering nurse practitioners, midwives, anaesthetists and clinical nurse specialists.
RN — Registered Nurse
A licensed nurse who completed a nursing degree and passed the NCLEX-RN examination.

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Practice location Address checks out

800 Howard Ave Yale Physicians Bldg
New Haven, CT 06519-1369
Phone: (203) 785-2140
Fax: (203) 785-6414
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Nurse Practitioner (primary) Taxonomy 363LF0000X · Licence 003167 (CT)

Record details

NPI number1932147675
Entity typeIndividual (Type 1)
GenderFemale
Credentials APRN , RN
Sole proprietorNo
NPI enumeratedJune 3, 2006
Last updated in NPPESJuly 13, 2026

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