Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Delna Mary John, MD

Individual provider Emergency Medicine Physician · NPI 1710340567

Delna Mary John, MD practises Emergency Medicine in Brooklyn, New York. Graduated from Eastern Virginia Medical School in 2016, 10 years ago. Practices with Trustees of Columbia University in the City of New York, a 2,250-clinician group and accepts Medicare assignment. Licensed in New York.

Years since qualifying
10
Trained at
Eastern Virginia Medical School
Licensed in
NY
In the registry since
2016
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

450 Clarkson Ave
Brooklyn, NY 11203-2012
Phone: (917) 544-4787
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence 304811 (NY)

Record details

NPI number1710340567
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 30, 2016
Last updated in NPPESAugust 9, 2021
Certification dateAugust 9, 2021

Medicare enrollment

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

Medicare specialtyEMERGENCY MEDICINE
Medical schoolEASTERN VIRGINIA MEDICAL SCHOOL
Graduated 2016 (10 years in practice)
Group practice Trustees Of Columbia University In The City Of New York — 2250 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 patients292
Services billed 309 a service is one billed item, such as a visit, a test or a procedure
Average patient age77

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.

Colleagues at Trustees of Columbia University in the City of New York

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 2250 clinicians in the practice; 12 are shown here.

Other providers in Brooklyn