IndividualActive
William Ruth, MD
NPI 1972578318 · Internal Medicine Physician · Cambridge, MA
William Ruth, MD is a Internal Medicine Physician provider in Cambridge, MA (NPI 1972578318).
Provider details
- NPI number
- 1972578318
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 34755 (MA)
Specialties & taxonomies
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
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
77 Mass Ave
Medical E23-395
Cambridge, MA 02139-4301
Phone: (617) 253-0556
Street-level locationGet directions
Mailing address
Po Box 425789
Cambridge, MA 02142-0015
Registry dates
- Enumerated
- 2006-02-21
- Last updated
- 2012-04-05
Frequently asked questions
- What is William Ruth's NPI number?
- William Ruth's National Provider Identifier (NPI) is 1972578318, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Ruth's specialty?
- William Ruth is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Ruth located?
- William Ruth's practice location on file with NPPES is 77 Mass Ave, Cambridge, MA 02139-4301.
- What is William Ruth's phone number?
- The practice phone number listed in the NPPES registry for William Ruth is (617) 253-0556.
- Is William Ruth's NPI active?
- Yes — William Ruth's NPI (1972578318) is active in the NPPES registry as of the last update on 2012-04-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.