Mary Elizabeth Callsen
Internal Medicine Physician · Bethesda, MD
Mary Elizabeth Callsen is an internal medicine physician with a practice address in Bethesda, Maryland, and NPI 1639137573, issued on May 2, 2006. Check the license (Maryland D0059499, as entered in NPPES) on the Maryland Board of Physicians; the Medicare figures below come from public CMS files.
- Name
- Mary Elizabeth Callsen
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- D0059499 MD
Self-reported in NPPES; status is on the state search - Practice location
- 7315 Wisconsin Ave, Bethesda, MD 20814
- Phone
- (240) 235-9100
- Enumerated
- May 2, 2006
- Record last updated
- Jan 27, 2023
- Medicare enrollment
- Enrolled (PECOS I20100525000299); accepts Medicare assignment
- Medical or professional school
- Ohio State University College Of Medicine, 1981
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 3,904 in Maryland → Look up another NPI →
Also registered at 7315 Wisconsin Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Mary Elizabeth Callsen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaryland Board of Physicians
Search for license D0059499Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
44% more Medicare Part D claims than the average internal medicine physician in 2024
4,561 Medicare Part D claims for 487 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims.
Most prescribed
- Atorvastatin Calcium600 claims
- Amlodipine Besylate242 claims
- Losartan Potassium221 claims
- Levothyroxine Sodium206 claims
- Hydrochlorothiazide189 claims
- Rosuvastatin Calcium179 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.
Bills Medicare through 2 group practices
- Johns Hopkins Community Physicians, IncLaurel, MD
- Suburban/nrh Medical Rehabilitation IncBethesda, MD
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mary Elizabeth Callsen among 3,904 internal medicine physician records in Maryland
Mary Elizabeth Callsen is one of 3,904 internal medicine physician records with a practice address in Maryland. 77% 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 9% of them.
- NPI issued2006 · 9% of these records are older, 55% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1981 · median 2003 among the 2,445 with a school on file
- Record last updated2023 · 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 207R00000X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
288 internal medicine physician records list a practice address in Bethesda
They are 288 of the 7,245 NPPES records with a practice address in Bethesda, and 3,904 internal medicine physician records in Maryland.
All 3,904 in Maryland → Every provider in Bethesda → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
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- Audrey Corson, M.D.Bethesda, MD 208141366402919
- Marjorie Dannis, MDBethesda, MD 208141316938269
- Delia Fine, M.D.Bethesda, MD 208141437119088
- Howard Goldstein, M.D.Bethesda, MD 208141952361925
- Joel Goozh, MDBethesda, MD 208141275518565
Common questions
What is Mary Elizabeth Callsen's NPI number?
Mary Elizabeth Callsen's National Provider Identifier (NPI) is 1639137573, issued on May 2, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mary Elizabeth Callsen located?
The NPPES record lists a practice address at 7315 Wisconsin Ave, Bethesda, MD, 20814. Phone: (240) 235-9100. Providers update this record themselves, so call before visiting.
How can I verify Mary Elizabeth Callsen's license?
NPPES lists Maryland license number D0059499, as entered by the provider. Search the Maryland Board of Physicians at https://www.mbp.state.md.us/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mary Elizabeth Callsen prescribe under Medicare Part D?
In 2024, Mary Elizabeth Callsen had 4,561 Medicare Part D claims for 487 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.