IndividualActive
John Harthorne, MD
NPI 1336103977 · Internal Medicine Physician · Boston, MA
John Harthorne, MD is a Internal Medicine Physician provider in Boston, MA (NPI 1336103977).
Provider details
- NPI number
- 1336103977
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- License
- 28404 (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
15 Parkman Street
Yaw 5
Boston, MA 02114-3117
Phone: (617) 726-2876
Fax: (617) 726-5988
Street-level locationGet directions
Mailing address
Po Box 9142
Charlestown, MA 02129-9142
Registry dates
- Enumerated
- 2006-04-12
- Last updated
- 2007-07-08
Frequently asked questions
- What is John Harthorne's NPI number?
- John Harthorne's National Provider Identifier (NPI) is 1336103977, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Harthorne's specialty?
- John Harthorne is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is John Harthorne located?
- John Harthorne's practice location on file with NPPES is 15 Parkman Street, Boston, MA 02114-3117.
- What is John Harthorne's phone number?
- The practice phone number listed in the NPPES registry for John Harthorne is (617) 726-2876.
- Is John Harthorne's NPI active?
- Yes — John Harthorne's NPI (1336103977) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.