Jonathan Williams, MD
NPI 1245297936 · Endocrinology, Diabetes & Metabolism Physician · Boston, MA
Enrolled with Medicare as Practitioner - Endocrinology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Jonathan Williams, MD is a Endocrinology, Diabetes & Metabolism Physician provider in Boston, MA (NPI 1245297936).
Provider details
- NPI number
- 1245297936
- Entity type
- Individual
- Primary specialty
- Endocrinology, Diabetes & Metabolism PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 204984 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 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
- 2006-04-27
- Last updated
- 2019-04-12
Frequently asked questions
- What is Jonathan Williams's NPI number?
- Jonathan Williams's National Provider Identifier (NPI) is 1245297936, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Jonathan Williams's specialty?
- Jonathan Williams is listed in the NPPES registry with a primary specialty of Endocrinology, Diabetes & Metabolism Physician (Allopathic & Osteopathic Physicians).
- Where is Jonathan Williams located?
- Jonathan Williams's practice location on file with NPPES is 221 Longwood Avenue Rfb 2, Boston, MA 02115.
- What is Jonathan Williams's phone number?
- The practice phone number listed in the NPPES registry for Jonathan Williams is (617) 732-5661.
- Does Jonathan Williams accept Medicare?
- Jonathan Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Jonathan Williams's NPI active?
- Yes — Jonathan Williams's NPI (1245297936) is active in the NPPES registry as of the last update on 2019-04-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.