Margaret Duffy, ARNP
NPI 1841293503 · Nurse Practitioner · Marshalltown, IA
Margaret Duffy, ARNP is a Nurse Practitioner provider in Marshalltown, IA (NPI 1841293503).
Provider details
- NPI number
- 1841293503
- Entity type
- Individual
- Primary specialty
- Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- ARNP
- Sex
- Female
- License
- #F-054726 (IA)
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
21 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
- 2005-05-24
- Last updated
- 2007-07-09
Frequently asked questions
- What is Margaret Duffy's NPI number?
- Margaret Duffy's National Provider Identifier (NPI) is 1841293503, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Margaret Duffy's specialty?
- Margaret Duffy is listed in the NPPES registry with a primary specialty of Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Margaret Duffy located?
- Margaret Duffy's practice location on file with NPPES is 407 E Main St, Marshalltown, IA 50158-1928.
- What is Margaret Duffy's phone number?
- The practice phone number listed in the NPPES registry for Margaret Duffy is (641) 752-4681.
- Is Margaret Duffy's NPI active?
- Yes — Margaret Duffy's NPI (1841293503) is active in the NPPES registry as of the last update on 2007-07-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.