Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

John D Morrissey, MD

Individual provider Critical Care Medicine (Internal Medicine) Physician · NPI 1740293984

John D Morrissey, MD is registered under Critical Care (Intensivists) in Washington, District of Columbia. Graduated from State University of New York Downstate Medical Center in 1987, 39 years ago. Practices with McLeod Health Clarendon, a 61-clinician group and accepts Medicare assignment. Licensed in District of Columbia.

Years since qualifying
39
Trained at
State University of New York Downstate Medical Center
Licensed in
DC
In the registry since
2006
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1150 Varnum St NE
Washington, DC 20017 Not confirmed with CMS for 13 years — call before visiting
Phone: (202) 269-7000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Critical Care Medicine (Internal Medicine) Physician (primary) Taxonomy 207RC0200X · Licence MD20772 (DC)
Hospitalist Physician Taxonomy 208M00000X · Licence MD20772 (DC)

Record details

NPI number1740293984
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedAugust 15, 2006
Last updated in NPPESJuly 29, 2013

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCRITICAL CARE (INTENSIVISTS)
Also practisesPULMONARY DISEASE
Medical schoolSTATE UNIVERSITY OF NEW YORK DOWNSTATE MEDICAL CENTER
Graduated 1987 (39 years in practice)
Group practice McLeod Health Clarendon — 61 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations6 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients246
Services billed 572 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Colleagues at McLeod Health Clarendon

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 61 clinicians in the practice; 12 are shown here.

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