Karen Leitner, M.D.
NPI 1043283658 · Internal Medicine Physician · Cambridge, MA
Karen Leitner, M.D. is a Internal Medicine Physician provider in Cambridge, MA (NPI 1043283658).
Provider details
- NPI number
- 1043283658
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 228045 (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
- 2006-02-13
- Last updated
- 2011-11-29
Frequently asked questions
- What is Karen Leitner's NPI number?
- Karen Leitner's National Provider Identifier (NPI) is 1043283658, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karen Leitner's specialty?
- Karen Leitner is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Karen Leitner located?
- Karen Leitner's practice location on file with NPPES is 237 Hampshire St, Cambridge, MA 02139-1306.
- What is Karen Leitner's phone number?
- The practice phone number listed in the NPPES registry for Karen Leitner is (617) 575-5570.
- Is Karen Leitner's NPI active?
- Yes — Karen Leitner's NPI (1043283658) is active in the NPPES registry as of the last update on 2011-11-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.