Mary Callahan, D.O.
Cardiovascular Disease Physician · Sandwich, MA
Mary Callahan, D.O. is a cardiovascular disease physician with a practice address in Sandwich, Massachusetts, and NPI 1518968882, issued on Aug 9, 2005. Check the license on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Mary Callahan
- Credential
- D.O.
- Primary taxonomy
- Cardiovascular Disease Physician 207RC0000X
- Practice location
- 68A Route 6A, Sandwich, MA 02563
- Phone
- (774) 413-5457
- Enumerated
- Aug 9, 2005
- Entity
- Type 1 · individual
Also registered at 68A Route 6A
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ramon Espinosa, M.D.Internal Medicine Physician1245287838
Verify Mary Callahan 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
29% fewer Medicare Part D claims than the average cardiovascular disease physician in 2024
2,246 Medicare Part D claims for 257 beneficiaries, against an average of 3,149 among the 19,556 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims.
Most prescribed
- Metoprolol Succinate321 claims
- Valsartan158 claims
- Rosuvastatin Calcium150 claims
- Amlodipine Besylate144 claims
- Lisinopril139 claims
- Atorvastatin Calcium137 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.
The Medicare quality score for 2023: 90.8 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $563.07
28 payments, mostly food and beverage; the largest payer was Novartis Pharmaceuticals Corporation. The 16,209 providers of this specialty with any payment received $4,923.81 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Cardiovascular Disease Physician providers in Massachusetts
There are 910 cardiovascular disease physician records in Massachusetts.
Other cardiovascular disease physician records in Massachusetts
- Omar Abdel-Razek, MDBoston, MA1912780008
- Rishard Abdul, M.B.B.SSpringfield, MA1114412830
- Kenneth Adams, M.D.Haverhill, MA1720082787
- Nicholas Adamstein, MDBoston, MA1548897218
- Dale Adler, M.D.Boston, MA1295769966
- Nadeem Afridi, MDNewburyport, MA1619961372
- Hanna Ahmed, M.DWorcester, MA1417111428
- Malik Ahmed, MDBoston, MA1386165470
- Eric Michael Aker, M.D.Norwood, MA1073571030
- Shahad Al Chalaby, MDBurlington, MA1316444276
Common questions
What is Mary Callahan, D.O.'s NPI number?
Mary Callahan, D.O.'s National Provider Identifier (NPI) is 1518968882, issued on Aug 9, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Mary Callahan, D.O. located?
The NPPES record lists a practice address at 68A Route 6A, Sandwich, MA, 02563. Phone: (774) 413-5457. Providers update this record themselves, so call before visiting.
How can I verify Mary Callahan, D.O.'s license?
Search the Massachusetts Board of Registration in Medicine at https://www.mass.gov/orgs/board-of-registration-in-medicine. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mary Callahan, D.O. prescribe under Medicare Part D?
In 2024, Mary Callahan, D.O. had 2,246 Medicare Part D claims for 257 beneficiaries; the average among cardiovascular disease physician prescribers was 3,149. Part D covers Medicare prescriptions only.
What is Mary Callahan, D.O.'s Medicare quality score?
The 2023 MIPS final score is 90.8 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 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.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.