Katharine Rainer, MD
NPI 1861121857 · Student in an Organized Health Care Education/Training Program · Boston, MA
Enrolled with Medicare as Order and Referring Only - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Katharine Rainer, MD is a Student in an Organized Health Care Education/Training Program provider in Boston, MA (NPI 1861121857).
Provider details
- NPI number
- 1861121857
- Entity type
- Individual
- Primary specialty
- Student in an Organized Health Care Education/Training ProgramStudent, Health Care
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 293398
Specialties & taxonomies
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
4 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
- 2022-06-07
- Last updated
- 2022-06-07
- Certified
- 2022-06-05
Frequently asked questions
- What is Katharine Rainer's NPI number?
- Katharine Rainer's National Provider Identifier (NPI) is 1861121857, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Katharine Rainer's specialty?
- Katharine Rainer is listed in the NPPES registry with a primary specialty of Student in an Organized Health Care Education/Training Program (Student, Health Care).
- Where is Katharine Rainer located?
- Katharine Rainer's practice location on file with NPPES is 330 Brookline Ave, Boston, MA 02215-5400.
- What is Katharine Rainer's phone number?
- The practice phone number listed in the NPPES registry for Katharine Rainer is (617) 667-7000.
- Does Katharine Rainer accept Medicare?
- Katharine Rainer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Katharine Rainer's NPI active?
- Yes — Katharine Rainer's NPI (1861121857) is active in the NPPES registry as of the last update on 2022-06-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.