Steven J. Mason, M.D.
Cardiovascular Disease Physician · Baltimore, MD
Steven J. Mason, M.D. is a cardiovascular disease physician with a practice address in Baltimore, Maryland, and NPI 1366445603, issued on May 31, 2005. Check the license (Maryland D0017347, as entered in NPPES) on the Maryland Board of Physicians; the Medicare figures below come from public CMS files.
- Name
- Steven J. Mason
- Credential
- M.D.
- Primary taxonomy
- Cardiovascular Disease Physician 207RC0000X
- License number
- D0017347 MD
Self-reported in NPPES; status is on the state search - Practice location
- 9105 Franklin Square Dr, Baltimore, MD 21237
- Phone
- (410) 574-1330
- Enumerated
- May 31, 2005
- Record last updated
- Aug 30, 2010 (not updated in 16 years: call before relying on the address or phone)
- Fax
- (410) 574-2691
- Medicaid ID
- 430361000 MD
- Medicare enrollment
- Enrolled (PECOS I20050106000723); may accept Medicare assignment
- Medical or professional school
- Harvard Medical School, 1972
- Entity
- Type 1 · individual
8 nearest cardiovascular disease physician records → All 613 in Maryland → Look up another NPI →
Also registered at 9105 Franklin Square Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Rafique Ahmed, MDCardiovascular Disease Physician1457354854
- Linda Alexander, MDObstetrics & Gynecology Physician1942407424
- Carlin Alleyne, M.D.Child & Adolescent Psychiatry Physician1376504514
- Cengiz Aygun, M.D.Specialist1174528798
- Leah Bergman, D.O.Cardiovascular Disease Physician1053756783
- Samantha Berlin, PA-CPhysician Assistant1841015187
Verify Steven J. Mason in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaryland Board of Physicians
Search for license D0017347Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average cardiovascular disease physician in 2024
25 Medicare Part D claims, against an average of 3,078 among the 20,728 providers of this specialty who prescribed in Part D.
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 UniversityBaltimore, MD
- Naples Heart Rhythm Specialists PANaples, FL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Steven J. Mason among 613 cardiovascular disease physician records in Maryland
Steven J. Mason, M.D. is one of 613 cardiovascular disease physician records with a practice address in Maryland. 76% 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, 78% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1972 · median 1997 among the 389 with a school on file
- Record last updated2010 · 67% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RC0000X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Cardiovascular Disease Physician providers in Maryland
There are 613 cardiovascular disease physician records in Maryland.
All 613 in Maryland → Every provider in Baltimore → Cardiovascular Disease Physician nationwide →
The 8 cardiovascular disease physician records with the nearest ZIP codes
- Rafique Ahmed, MDBaltimore, MD 212371457354854
- Ebony Alston, M.D.Baltimore, MD 212371073803136
- Rahul Anand, M.B.B.SBaltimore, MD 212371942640917
- Tamara AshvetiyaBaltimore, MD 212371760722540
- Leah Bergman, D.O.Baltimore, MD 212371053756783
- George Bittar, MDBaltimore, MD 212371760452171
- Jeffrey Brown, M.D.Baltimore, MD 212371760485122
- Rodney Johnson, M.D.Baltimore, MD 212371356344659
Common questions
What is Steven J. Mason, M.D.'s NPI number?
Steven J. Mason, M.D.'s National Provider Identifier (NPI) is 1366445603, issued on May 31, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Steven J. Mason, M.D. located?
The NPPES record lists a practice address at 9105 Franklin Square Dr, Baltimore, MD, 21237. Phone: (410) 574-1330. Providers update this record themselves, so call before visiting.
How can I verify Steven J. Mason, M.D.'s license?
NPPES lists Maryland license number D0017347, 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 Steven J. Mason, M.D. prescribe under Medicare Part D?
In 2024, Steven J. Mason, M.D. had 25 Medicare Part D claims; the average among cardiovascular disease physician prescribers was 3,078. 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.