Margaret M. Koehm, MD
Family Medicine Physician · Nantucket, MA
Margaret M. Koehm, MD is a family medicine physician with a practice address in Nantucket, Massachusetts, and NPI 1255315545, issued on Dec 1, 2005. Check the license (Massachusetts 213100, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Margaret M. Koehm
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License numbers
- 213100 MA
MD213100 RI
Self-reported in NPPES; status is on the state search - Practice location
- 57 Prospect St, Nantucket, MA 02554
- Phone
- (508) 325-9981
- Enumerated
- Dec 1, 2005
- Record last updated
- Jan 16, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (508) 325-8558
- Medicaid ID
- 9022680 RI
- Medicare enrollment
- Enrolled (PECOS I20090901000011); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 2,265 in Massachusetts → Look up another NPI →
Also registered at 57 Prospect St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Annette Bell-Thompson, NPFamily Nurse Practitioner1265366371
- Candy Bernier, FNP-BCFamily Nurse Practitioner1376020099
- George Butterworth, MDFamily Medicine Physician1710993589
- Eileen Carlsen, NPFamily Nurse Practitioner1467514661
- Allison Dao, NURSE PRACTITIONERFamily Nurse Practitioner1689885485
Verify Margaret M. Koehm in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 213100Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
67% fewer Medicare Part D claims than the average family medicine physician in 2024
1,169 Medicare Part D claims for 105 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium106 claims
- Metoprolol Succinate42 claims
- Albuterol Sulfate Hfa32 claims
- Simvastatin32 claims
- Gabapentin31 claims
- Lisinopril30 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.
2 hospitals and group practices
- Nantucket Cottage HospitalNantucket, MA · Acute Care Hospitals3 of 5 stars
- Nantucket Physicians OrganizationNantucket, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Margaret M. Koehm among 2,265 family medicine physician records in Massachusetts
Margaret M. Koehm, 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 86% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated1995 · median 2006 among the 1,529 with a school on file
- 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).
4 family medicine physician records list a practice address in Nantucket
They are 4 of the 198 NPPES records with a practice address in Nantucket, and 2,265 family medicine physician records in Massachusetts.
All 2,265 in Massachusetts → Every provider in Nantucket → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- George Butterworth, MDNantucket, MA 025541710993589
- Timothy Lepore, MDNantucket, MA 025541720041023
- Diane Pearl, MDNantucket, MA 025541427062959
- Natalie Chambers, M.D., P.C.North Falmouth, MA 025561336180975
- James Vereen, D.O.North Falmouth, MA 025561043474018
- Judith Fisher, MDOak Bluffs, MA 025571841256807
- Hugh Harwood, MDOak Bluffs, MA 025571063582880
- Ruppert Hawes, M.D.Oak Bluffs, MA 025571982655320
Common questions
What is Margaret M. Koehm, MD's NPI number?
Margaret M. Koehm, MD's National Provider Identifier (NPI) is 1255315545, issued on Dec 1, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Margaret M. Koehm, MD located?
The NPPES record lists a practice address at 57 Prospect St, Nantucket, MA, 02554. Phone: (508) 325-9981. Providers update this record themselves, so call before visiting.
How can I verify Margaret M. Koehm, MD's license?
NPPES lists Massachusetts license number 213100, 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.
How much does Margaret M. Koehm, MD prescribe under Medicare Part D?
In 2024, Margaret M. Koehm, MD had 1,169 Medicare Part D claims for 105 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.