Karen L. Ahlert, M.D.
Surgery Physician · Cambridge, MA
Karen L. Ahlert, M.D. is a surgery physician with a practice address in Cambridge, Massachusetts, and NPI 1083819502, issued on Jun 15, 2007. Check the license (Massachusetts 253631, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Karen L. Ahlert
- Credential
- M.D.
- Primary taxonomy
- Surgery Physician 208600000X
- License numbers
- 253631 MA
L-231744 MA
Self-reported in NPPES; status is on the state search - Practice location
- 300 Mount Auburn St, Cambridge, MA 02138
- Phone
- (617) 868-7456
- Enumerated
- Jun 15, 2007
- Record last updated
- Mar 20, 2017 (not updated in 9 years: call before relying on the address or phone)
- Fax
- (617) 868-9243
- Medicaid ID
- 110094173A MA
- Medicare enrollment
- Enrolled (PECOS I20121210000307); accepts Medicare assignment
- Medical or professional school
- Tufts University School Of Medicine, 2007
- Entity
- Type 1 · individual
8 nearest surgery physician records → All 1,003 in Massachusetts → Look up another NPI →
Also registered at 300 Mount Auburn St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Karen L. Ahlert in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 253631Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- Mount Auburn Professional Services IncCambridge, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Karen L. Ahlert among 1,003 surgery physician records in Massachusetts
Karen L. Ahlert, M.D. is one of 1,003 surgery physician records with a practice address in Massachusetts. 66% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 42% of them.
- NPI issued2007 · 42% of these records are older, 50% newer
- In a Medicare fileYes · 66% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated2007 · median 2003 among the 503 with a school on file
- Record last updated2017 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208600000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Surgery Physician providers in Massachusetts
There are 1,003 surgery physician records in Massachusetts.
All 1,003 in Massachusetts → Every provider in Cambridge → Surgery Physician nationwide →
The 8 surgery physician records with the nearest ZIP codes
- Aram Demirjian, M.D.Cambridge, MA 021381164661906
- Gabrielle Dombek, MDCambridge, MA 021381699160804
- Michael Dombek, MDCambridge, MA 021381366837536
- Michelle Fakler, M.D.Cambridge, MA 021381932593597
- Joel Feldman, MDCambridge, MA 021381780674804
- Jordan Gutweiler, MDCambridge, MA 021381811079536
- John Kenagy, M.D.Cambridge, MA 021381548460850
- Julie Kim, MDCambridge, MA 021381851305049
Common questions
What is Karen L. Ahlert, M.D.'s NPI number?
Karen L. Ahlert, M.D.'s National Provider Identifier (NPI) is 1083819502, issued on Jun 15, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Karen L. Ahlert, M.D. located?
The NPPES record lists a practice address at 300 Mount Auburn St, Cambridge, MA, 02138. Phone: (617) 868-7456. Providers update this record themselves, so call before visiting.
How can I verify Karen L. Ahlert, M.D.'s license?
NPPES lists Massachusetts license number 253631, 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. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
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.