Frieda Duffy, RN
NPI 1336787498 · Psychiatric/Mental Health Clinical Nurse Specialist · Marlborough, MA
Frieda Duffy, RN is a Psychiatric/Mental Health Clinical Nurse Specialist provider in Marlborough, MA (NPI 1336787498).
Provider details
- NPI number
- 1336787498
- Entity type
- Individual
- Primary specialty
- Psychiatric/Mental Health Clinical Nurse SpecialistPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- RN
- Sex
- Female
- Sole proprietor
- Yes
- License
- RN167040 (MA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
6 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2019-12-19
- Last updated
- 2026-01-13
- Certified
- 2026-01-13
Frequently asked questions
- What is Frieda Duffy's NPI number?
- Frieda Duffy's National Provider Identifier (NPI) is 1336787498, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Frieda Duffy's specialty?
- Frieda Duffy is listed in the NPPES registry with a primary specialty of Psychiatric/Mental Health Clinical Nurse Specialist (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Frieda Duffy located?
- Frieda Duffy's practice location on file with NPPES is 10 W Hill Rd, Marlborough, MA 01752-4590.
- What is Frieda Duffy's phone number?
- The practice phone number listed in the NPPES registry for Frieda Duffy is (978) 808-8745.
- Is Frieda Duffy's NPI active?
- Yes — Frieda Duffy's NPI (1336787498) is active in the NPPES registry as of the last update on 2026-01-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.