Cassidy Claassen, M.D.
Hospitalist Physician · Baltimore, MD
Cassidy Claassen, M.D. is a hospitalist physician with a practice address in Baltimore, Maryland, and NPI 1477796696, issued on Apr 17, 2009. Check the license (Maryland D74704, as entered in NPPES) on the Maryland Board of Physicians; the Medicare figures below come from public CMS files.
- Name
- Cassidy Claassen
- Credential
- M.D.
- Primary taxonomy
- Hospitalist Physician 208M00000X
- License number
- D74704 MD
Self-reported in NPPES; status is on the state search - Practice location
- 22 S Greene St, Baltimore, MD 21201
- Phone
- (410) 328-2882
- Enumerated
- Apr 17, 2009
- Record last updated
- Feb 1, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (410) 328-2977
- Medicaid ID
- 335424500 MD
- Medicare enrollment
- Enrolled (PECOS I20121012000300); accepts Medicare assignment
- Medical or professional school
- University Of Maryland School Of Medicine, 2009
- Entity
- Type 1 · individual
8 nearest hospitalist physician records → All 397 in Maryland → Look up another NPI →
Also registered at 22 S Greene St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Mohammad Abdulelah, MDStudent in an Organized Health Care Education/Training Program1114650108
- Leenah AbdulgaderStudent in an Organized Health Care Education/Training Program1386323301
- Ifedayo Abiola-Matthew, CRNPAcute Care Nurse Practitioner1033781117
Verify Cassidy Claassen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaryland Board of Physicians
Search for license D74704Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- University OF Maryland Physicians PABaltimore, MD
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Cassidy Claassen among 397 hospitalist physician records in Maryland
Cassidy Claassen, M.D. is one of 397 hospitalist physician records with a practice address in Maryland. 91% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 36% of them.
- NPI issued2009 · 36% of these records are older, 60% newer
- In a Medicare fileYes · 91% of these records are
- In the CMS Doctors and Clinicians fileYes · 83% of these records are
- Graduated2009 · median 2010 among the 330 with a school on file
- Record last updated2013 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208M00000X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hospitalist Physician providers in Maryland
There are 397 hospitalist physician records in Maryland.
All 397 in Maryland → Every provider in Baltimore → Hospitalist Physician nationwide →
The 8 hospitalist physician records with the nearest ZIP codes
- George Baffoe-Bonnie, M.D.Baltimore, MD 212011780642090
- Lei Jia Chen, MDBaltimore, MD 212011144422049
- Kimberly Clark, PA-CBaltimore, MD 212011144368226
- Philip Dittmar, MDBaltimore, MD 212011932243342
- Kathryn Eshelman, M.D.Baltimore, MD 212011558375147
- Mangla Gulati, M.D.Baltimore, MD 212011740259274
- Cheryl Hepp, MDBaltimore, MD 212011023152444
- Saverio Mirarchi, M.D.Baltimore, MD 212011639124365
Common questions
What is Cassidy Claassen, M.D.'s NPI number?
Cassidy Claassen, M.D.'s National Provider Identifier (NPI) is 1477796696, issued on Apr 17, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Cassidy Claassen, M.D. located?
The NPPES record lists a practice address at 22 S Greene St, Baltimore, MD, 21201. Phone: (410) 328-2882. Providers update this record themselves, so call before visiting.
How can I verify Cassidy Claassen, M.D.'s license?
NPPES lists Maryland license number D74704, 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.
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.