James O'Brien, NP
NPI 1558101964 · Nurse Practitioner · Boston, MA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
James O'Brien, NP is a Nurse Practitioner provider in Boston, MA (NPI 1558101964).
Provider details
- NPI number
- 1558101964
- Entity type
- Individual
- Primary specialty
- Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- NP
- Sex
- Male
- Sole proprietor
- No
- License
- F354034-01 (NY)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
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
2 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
- 2024-05-31
- Last updated
- 2024-09-09
- Certified
- 2024-09-09
Frequently asked questions
- What is James O'Brien's NPI number?
- James O'Brien's National Provider Identifier (NPI) is 1558101964, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is James O'Brien's specialty?
- James O'Brien is listed in the NPPES registry with a primary specialty of Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is James O'Brien located?
- James O'Brien's practice location on file with NPPES is 18 Newbury St Fl 5, Boston, MA 02116-3246.
- What is James O'Brien's phone number?
- The practice phone number listed in the NPPES registry for James O'Brien is (617) 304-1965.
- Does James O'Brien accept Medicare?
- James O'Brien is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is James O'Brien's NPI active?
- Yes — James O'Brien's NPI (1558101964) is active in the NPPES registry as of the last update on 2024-09-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.