NPPES file of Aug 9, 2026

Karen Debra Leitner, M.D.

Internal Medicine Physician · Cambridge, MA

Karen Debra Leitner, M.D. is an internal medicine physician with a practice address in Cambridge, Massachusetts, and NPI 1043283658, issued on Feb 13, 2006. Check the license (Massachusetts 228045, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the federal record below is the public data PlainDoctor holds for this provider.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1043283658
Name
Karen Debra Leitner
Credential
M.D.
Primary taxonomy
Internal Medicine Physician 207R00000X
License number
228045 MA
Self-reported in NPPES; status is on the state search
Practice location
237 Hampshire St, Cambridge, MA 02139
Phone
(617) 575-5570
Enumerated
Feb 13, 2006
Record last updated
Nov 29, 2011 (not updated in 15 years: call before relying on the address or phone)
Medicaid ID
2120763 MA
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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8 nearest internal medicine physician records → All 6,825 in Massachusetts → Look up another NPI →

Also registered at 237 Hampshire St

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Elvira Aronzon, PA-CPhysician Assistant1851358279
  2. Henrietta BarnesInternal Medicine Physician1245393701
  3. Becky Bjorkman, R.N.Registered Nurse1841797487
  4. Laura Delaney, R.N.Registered Nurse1679910947
  5. Yelizaveta DimantClinical Social Worker1568832749
  6. David Elvin, M.D.Internal Medicine Physician1245250661

Verify Karen Debra Leitner in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
    Search for license 228045    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Massachusetts license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Karen Debra Leitner among 6,825 internal medicine physician records in Massachusetts

Karen Debra Leitner, M.D. is one of 6,825 internal medicine physician records with a practice address in Massachusetts. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2006, is newer than 12% of them.

  • NPI issued2006 · 12% of these records are older, 54% newer
  • In a Medicare fileNo · 75% of these records are
  • In the CMS Doctors and Clinicians fileNo · 60% of these records are
  • Record last updated2011 · 64% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

300 internal medicine physician records list a practice address in Cambridge

They are 300 of the 5,145 NPPES records with a practice address in Cambridge, and 6,825 internal medicine physician records in Massachusetts. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 6,825 in Massachusetts → Every provider in Cambridge → Internal Medicine Physician nationwide →

The 8 internal medicine physician records with the nearest ZIP codes

  1. David Baron, MDCambridge, MA 021391376503318
  2. John Brusch, MDCambridge, MA 021391639138449
  3. David Diamond, MDCambridge, MA 021391265411664
  4. Leigh Firn, MDCambridge, MA 021391194706507
  5. Agnes Graves, M.D.Cambridge, MA 021391932160934
  6. Howard Heller, MDCambridge, MA 021391508856287
  7. Michael Kane, MDCambridge, MA 021391376524769
  8. William Kettyle, MDCambridge, MA 021391306823414

Common questions

What is Karen Debra Leitner, M.D.'s NPI number?

Karen Debra Leitner, M.D.'s National Provider Identifier (NPI) is 1043283658, issued on Feb 13, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Karen Debra Leitner, M.D. located?

The NPPES record lists a practice address at 237 Hampshire St, Cambridge, MA, 02139. Phone: (617) 575-5570. Providers update this record themselves, so call before visiting.

How can I verify Karen Debra Leitner, M.D.'s license?

NPPES lists Massachusetts license number 228045, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.