Margaret Gillis
NPI 1447047139 · Internal Medicine Physician · Boston, MA
Enrolled with Medicare as Order and Referring Only - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Margaret Gillis is a Internal Medicine Physician provider in Boston, MA (NPI 1447047139).
Provider details
- NPI number
- 1447047139
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Sole proprietor
- No
- License
- 3019272 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
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
Mailing address
Registry dates
- Enumerated
- 2025-04-24
- Last updated
- 2025-05-22
- Certified
- 2025-05-22
Frequently asked questions
- What is Margaret Gillis's NPI number?
- Margaret Gillis's National Provider Identifier (NPI) is 1447047139, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Margaret Gillis's specialty?
- Margaret Gillis is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Margaret Gillis located?
- Margaret Gillis's practice location on file with NPPES is 800 Washington St, Boston, MA 02111-1552.
- What is Margaret Gillis's phone number?
- The practice phone number listed in the NPPES registry for Margaret Gillis is (617) 636-5000.
- Does Margaret Gillis accept Medicare?
- Margaret Gillis is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Margaret Gillis's NPI active?
- Yes — Margaret Gillis's NPI (1447047139) is active in the NPPES registry as of the last update on 2025-05-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.