Karen Ottenstein, MD
Family Medicine Physician · Westport, MA
Karen Ottenstein, MD is a family medicine physician with a practice address in Westport, Massachusetts, and NPI 1083628382, issued on Jul 29, 2006. Check the license on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Karen Ottenstein
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 021409 ME
Self-reported in NPPES; status is on the state search - Practice location
- 793 Main RD, Westport, MA 02790
- Phone
- (508) 636-7890
- Enumerated
- Jul 29, 2006
- Record last updated
- May 30, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (508) 636-7299
- Medicaid ID
- 218430099 ME
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 2,265 in Massachusetts → Look up another NPI →
Also registered at 793 Main RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Cathleen Hood, M.D.Family Medicine Physician1447238852
Verify Karen Ottenstein in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in MedicineCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average family medicine physician in 2024
109 Medicare Part D claims for 36 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium11 claims
- Sertraline Hcl11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Karen Ottenstein among 2,265 family medicine physician records in Massachusetts
Karen Ottenstein, MD is one of 2,265 family medicine physician records with a practice address in Massachusetts. 80% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 14% of them.
- NPI issued2006 · 14% of these records are older, 55% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileNo · 68% of these records are
- Record last updated2018 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
7 family medicine physician records list a practice address in Westport
They are 7 of the 127 NPPES records with a practice address in Westport, and 2,265 family medicine physician records in Massachusetts.
All 2,265 in Massachusetts → Every provider in Westport → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Dennis Callen, M.D.Westport, MA 027901790787752
- Nancy Carney, M.D.Westport, MA 027901366456360
- Jacqueline Draper, M.D.Westport, MA 027901881008324
- Cathleen Hood, M.D.Westport, MA 027901447238852
- Jane Li, MDWestport, MA 027901073502431
- Binu Oien, DOWestport, MA 027901336552223
- Charelle Allen, MDTaunton, MA 027801114629706
- William Brandon, MDTaunton, MA 027801770562548
Common questions
What is Karen Ottenstein, MD's NPI number?
Karen Ottenstein, MD's National Provider Identifier (NPI) is 1083628382, issued on Jul 29, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Karen Ottenstein, MD located?
The NPPES record lists a practice address at 793 Main RD, Westport, MA, 02790. Phone: (508) 636-7890. Providers update this record themselves, so call before visiting.
How can I verify Karen Ottenstein, MD's license?
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.
How much does Karen Ottenstein, MD prescribe under Medicare Part D?
In 2024, Karen Ottenstein, MD had 109 Medicare Part D claims for 36 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
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.