What is Julia Duffy's NPI number?

Julia Duffy's National Provider Identifier (NPI) is 1205650074, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Julia Duffy's specialty?

Julia Duffy is listed in the NPPES registry with a primary specialty of Obstetrics & Gynecology Physician (Allopathic & Osteopathic Physicians).

Where is Julia Duffy located?

Julia Duffy's practice location on file with NPPES is 800 Washington St, Boston, MA 02111-1552.

What is Julia Duffy's phone number?

The practice phone number listed in the NPPES registry for Julia Duffy is (617) 636-2229.

Is Julia Duffy's NPI active?

Yes — Julia Duffy's NPI (1205650074) is active in the NPPES registry as of the last update on 2026-04-28.

IndividualActive

Julia Duffy

NPI 1205650074 · Obstetrics & Gynecology Physician · Boston, MA

Julia Duffy is a Obstetrics & Gynecology Physician provider in Boston, MA (NPI 1205650074).

Provider details

NPI number: 1205650074
Entity type: Individual
Primary specialty: Obstetrics & Gynecology PhysicianAllopathic & Osteopathic Physicians
Sex: Female
Sole proprietor: Yes
License: 3020977 (MA)

Specialties & taxonomies

Obstetrics & Gynecology PhysicianPrimary207V00000XLicense 3020977 (MA)
Allopathic & Osteopathic Physicians

Profile Score

Established profile(55/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure38% of score
1 yr 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

800 Washington St

Boston, MA 02111-1552

Phone: (617) 636-2229

Street-level locationGet directions

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Mailing address