IndividualActive
William Kaelin, M.D.
NPI 1093994493 · Internal Medicine Physician · Boston, MA
William Kaelin, M.D. is a Internal Medicine Physician provider in Boston, MA (NPI 1093994493).
Provider details
- NPI number
- 1093994493
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 57621 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(88/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
18 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
44 Binney Street
Dana Farber Cancer Institute
Boston, MA 02115
Phone: (617) 632-3975
Street-level locationGet directions
Mailing address
44 Binny Street, Mayer 457
Boston, MA 02115
Registry dates
- Enumerated
- 2007-11-01
- Last updated
- 2007-11-01
Frequently asked questions
- What is William Kaelin's NPI number?
- William Kaelin's National Provider Identifier (NPI) is 1093994493, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Kaelin's specialty?
- William Kaelin is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Kaelin located?
- William Kaelin's practice location on file with NPPES is 44 Binney Street, Boston, MA 02115.
- What is William Kaelin's phone number?
- The practice phone number listed in the NPPES registry for William Kaelin is (617) 632-3975.
- Is William Kaelin's NPI active?
- Yes — William Kaelin's NPI (1093994493) is active in the NPPES registry as of the last update on 2007-11-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.