What is Barbara O'Neil's NPI number?

Barbara O'Neil's National Provider Identifier (NPI) is 1275565335, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Barbara O'Neil's specialty?

Barbara O'Neil is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).

Where is Barbara O'Neil located?

Barbara O'Neil's practice location on file with NPPES is 1611 Cambridge St, Cambridge, MA 02138-4302.

What is Barbara O'Neil's phone number?

The practice phone number listed in the NPPES registry for Barbara O'Neil is (617) 661-5500.

Is Barbara O'Neil's NPI active?

Yes — Barbara O'Neil's NPI (1275565335) is active in the NPPES registry as of the last update on 2007-07-08.

IndividualActive

Barbara O'Neil, M.D.

NPI 1275565335 · Internal Medicine Physician · Cambridge, MA

Barbara O'Neil, M.D. is a Internal Medicine Physician provider in Cambridge, MA (NPI 1275565335).

Provider details

NPI number: 1275565335
Entity type: Individual
Primary specialty: Internal Medicine PhysicianAllopathic & Osteopathic Physicians
Credential: M.D.
Sex: Female
Sole proprietor: No
License: 51296 (MA)

Specialties & taxonomies

Internal Medicine PhysicianPrimary207R00000XLicense 51296 (MA)
Allopathic & Osteopathic Physicians

Profile Score

Detailed profile(91/100 index)

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

Registry tenure38% of score
19 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

1611 Cambridge St

Cambridge, MA 02138-4302

Phone: (617) 661-5500

Fax: (617) 661-5460

Street-level locationGet directions

More MA providers

Mailing address

147 Milk St

Boston, MA 02109-4806

Enumerated: 2006-07-07
Last updated: 2007-07-08

Frequently asked questions

What is Barbara O'Neil's NPI number?: Barbara O'Neil's National Provider Identifier (NPI) is 1275565335, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
What is Barbara O'Neil's specialty?: Barbara O'Neil is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
Where is Barbara O'Neil located?: Barbara O'Neil's practice location on file with NPPES is 1611 Cambridge St, Cambridge, MA 02138-4302.
What is Barbara O'Neil's phone number?: The practice phone number listed in the NPPES registry for Barbara O'Neil is (617) 661-5500.
Is Barbara O'Neil's NPI active?: Yes — Barbara O'Neil's NPI (1275565335) is active in the NPPES registry as of the last update on 2007-07-08.

Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.