Africa South of the SaharaHIV InfectionsSocial Stigma
Dr. Cassidy W. Claassen, MD
NPI1477796696PAC ID6901055631
- Medicare services, 2023
- 49
- Medicare patients, 2024
- 11
- Publications
- 35
- Hospital affiliations
- 1
- Industry payments
- $114
- Practice address
- 22 South Greene Street, Baltimore, MD 21201
- Practice phone
- Call (410) 328-8667
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Claassen's professional email, personal email and mobile number
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Dr. Cassidy W. Claassen is a hospitalist in Baltimore, Maryland
Dr. Claassen practices at University of Maryland Medical Center in Baltimore, Maryland, part of University of Maryland Medical System.
Dr. Claassen's NPI, 1477796696, was assigned on April 17, 2009. Dr. Claassen graduated from University of Maryland School of Medicine in 2009. Dr. Claassen holds Maryland license D74704.
NPI and contact details
- NPI
- 1477796696NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6901055631
- NPI enumeration date
- April 17, 2009
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (410) 328-8667
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 43
- Medical school graduation
- 2009
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Cassidy W. Claassen practices at University of Maryland Medical Center in Baltimore, Maryland
Dr. Claassen's primary practice is University of Maryland Medical Center, at 22 South Greene Street, Baltimore, MD 21201 in Baltimore City. The practice phone is (410) 328-8667.
- University of Maryland Medical Center22 South Greene Street, Baltimore, MD 21201 · Baltimore CityPhone(410) 328-8667
Source: Dmand AI Affiliation Data
Dr. Cassidy W. Claassen is affiliated with 1 site of care and 1 medical group
Dr. Claassen's primary practice is University of Maryland Medical Center in Baltimore, Maryland, part of University of Maryland Medical System. The medical group on file is University of Maryland Medical Center Gastroenterology and Hepatology.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Cassidy W. Claassen's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Claassen practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| University of Maryland Medical Center | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
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Dr. Cassidy W. Claassen is one of 415 hospitalists in Maryland
Hospitalist is Dr. Claassen's primary specialty in the NPI Registry, under taxonomy code 208M00000X. Dr. Claassen is licensed in Maryland.
Specialties and state licenses
- Hospitalist, MarylandPrimary
Hospitalists near Dr. Claassen
Counts of hospitalists with a Dmand AI profile, by place and practice. Each opens the list.
415hospitalists in Maryland111hospitalists in Baltimore31hospitalists at University of Maryland Medical Center
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Cassidy W. Claassen billed Medicare for 49 services in 2023
CMS data shows 49 Medicare services from Dr. Claassen across 2 procedure codes in 2023, for 11 Medicare patients. Medicare paid $4,412 for them. Every service was in a facility, such as a hospital, rather than an office.
Medicare services, 202349
Medicare patients11
Paid by Medicare$4,412
Procedure codes2
Dr. Claassen's Medicare services by type, 2021 to 2023
- 2021
- 2023
- Office and hospital visits
- 2021: 402023: 4923%
Dr. Claassen compared with the Maryland median for hospitalists, 2023
- Dr. Claassen
- Maryland median
- Medicare services
- 49vs 65092% below
- Medicare patients
- 11vs 29196% below
Medians across 388 hospitalists in Maryland with Dmand AI profiles that report each measure.
Dr. Claassen's most billed Medicare procedure codes, 2023
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Claassen?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Claassen and other hospitalists in Maryland.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Cassidy W. Claassen treated 11 Medicare patients in 2024, average age 62
CMS counts 11 Medicare patients who saw Dr. Claassen in 2024. The largest group is 85 and over, with 0 patients. Their average risk score is 3.36, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Claassen's median patient age at 52, with 50% women.
Medicare patients, 202411
Average age62
Average risk score3.36
Dr. Claassen's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Claassen's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 52
Patient panel by sex, all payers
- Women50%
- Men50%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
How Dr. Cassidy W. Claassen takes part in Medicare
Dr. Claassen accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Cassidy W. Claassen has 35 publications on record
Dmand AI links 35 papers to Dr. Claassen, published from 2012 to 2025. 2019 was the busiest year, with 4. The most frequent topics are HIV Infections, Zambia and Anti-HIV Agents. Dr. Claassen has published most often in J Int AIDS Soc. Dr. Claassen's most frequent co-authors are Devang Patel, MD, David J. Riedel, MD and Miriam K. Laufer, MD.
Papers35
Years published2012 to 2025
Dr. Claassen's papers by year, 2015 to 2025
Topics Dr. Claassen writes about most
- HIV Infections
- Zambia
- Anti-HIV Agents
- Pre-Exposure Prophylaxis
- HIV Testing
- Qualitative Research
- Social Stigma
- Acquired Immunodeficiency Syndrome
Dr. Claassen's most frequent co-authors
- Devang Patel, MD3 shared papers
- David J. Riedel, MD3 shared papers
- Miriam K. Laufer, MD2 shared papers
Recent publications by Dr. Claassen
Cost of IllnessEpidemicsFocus Groups
BMC Public Health
Anti-HIV AgentsFocus GroupsHealth Knowledge, Attitudes, Practice
J Neurol Sci
HeadacheHeadache Disorders, PrimaryHIV Infections
See who Dr. Claassen researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Claassen works with, so you can find a warm path to the right hospitalists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Cassidy W. Claassen received $114 in industry payments from 2017 to 2023
CMS Open Payments shows 2 general payments to Dr. Claassen from 2 drug and device companies from 2017 to 2023. Food and beverage make up the largest share, 74% of the total. Gilead Sciences, Inc. paid the most, $84.
General payments to Dr. Claassen by program year, 2017 to 2023
General payments to Dr. Claassen by kind, 2017 to 2023
$114in total
- Food and beverage$8474%
- Education$3026%
Companies that paid Dr. Claassen the most, 2017 to 2023
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Cassidy W. Claassen graduated from University of Maryland School of Medicine
Dr. Claassen graduated from University of Maryland School of Medicine in 2009.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Cassidy W. Claassen's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Cassidy W. Claassen
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Cassidy W. Claassen's NPI number?
Dr. Cassidy W. Claassen's NPI number is 1477796696. It was assigned on April 17, 2009, and it is active in the NPI Registry.
What kind of doctor is Dr. Cassidy W. Claassen?
Dr. Cassidy W. Claassen is a hospitalist in Baltimore, Maryland. The primary specialty in the NPI Registry is Hospitalist Physician (taxonomy code 208M00000X).
Where does Dr. Cassidy W. Claassen practice?
Dr. Claassen practices at 22 South Greene Street, Baltimore, MD 21201. Dr. Claassen's primary practice is University of Maryland Medical Center in Baltimore, Maryland, part of University of Maryland Medical System.
What is Dr. Cassidy W. Claassen's office phone number?
The practice phone on file for Dr. Claassen is (410) 328-8667.
What is Dr. Cassidy W. Claassen's medical license number?
Dr. Claassen holds Maryland license D74704.
Which hospitals is Dr. Cassidy W. Claassen affiliated with?
Dr. Claassen practices at University of Maryland Medical Center in Baltimore, Maryland.
What medical group is Dr. Cassidy W. Claassen part of?
Dr. Claassen is linked to University of Maryland Medical Center Gastroenterology and Hepatology.
Does Dr. Cassidy W. Claassen accept Medicare?
Yes. CMS data shows Dr. Claassen billed Medicare for 49 services in 2023, and Dr. Claassen accepts Medicare assignment.
How many Medicare patients does Dr. Cassidy W. Claassen see?
CMS counts 11 Medicare patients who saw Dr. Claassen in 2024, with an average age of 62.
What services does Dr. Cassidy W. Claassen bill to Medicare?
In 2023, Dr. Claassen's most billed Medicare services were hospital inpatient care (99232) and hospital inpatient care (99223).
Show 5 more questionsShow fewer questions
Where did Dr. Cassidy W. Claassen go to medical school?
Dr. Claassen graduated from University of Maryland School of Medicine in 2009.
Has Dr. Cassidy W. Claassen received payments from drug or device companies?
CMS Open Payments shows $114 in general payments to Dr. Claassen from 2 companies from 2017 to 2023. The largest total came from Gilead Sciences, Inc.
How long has Dr. Cassidy W. Claassen been practicing?
Dr. Claassen graduated from medical school in 2009, 17 years ago.
Does Dr. Cassidy W. Claassen do research?
Dmand AI links 35 publications to Dr. Claassen, published from 2012 to 2025.
Who does Dr. Cassidy W. Claassen publish with?
Dr. Claassen's most frequent co-authors are Devang Patel, MD (3 shared papers), David J. Riedel, MD (3 shared papers) and Miriam K. Laufer, MD (2 shared papers).
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