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

John D Day, MD

Individual provider Cardiovascular Disease Physician · NPI 1811965122

John D Day, MD is a Cardiac Electrophysiology in Salt Lake City, Utah. Graduated from Johns Hopkins University School of Medicine in 1995, 31 years ago. Practices with Mountainstar Cardiology St Marks LLC, a 42-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Utah.

Years since qualifying
31
Trained at
Johns Hopkins University School of Medicine
Licensed in
UT
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

1160 E 3900 S Ste 2000
Salt Lake City, UT 84124-1236
Phone: (801) 266-3418
Fax: (801) 266-4174
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Cardiac Electrophysiology Physician (primary) Taxonomy 207RC0001X · Licence 4849787-1205 (UT)
Cardiovascular Disease Physician Taxonomy 207RC0000X · Licence 48497871205 (UT)

Record details

NPI number1811965122
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 11, 2006
Last updated in NPPESDecember 1, 2020
Certification dateDecember 1, 2020
Mailing addressPo Box 741729, Atlanta, GA 30374-1729

Medicare enrollment

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

Medicare specialtyCARDIAC ELECTROPHYSIOLOGY
Also practisesINTERNAL MEDICINE
Medical schoolJOHNS HOPKINS UNIVERSITY SCHOOL OF MEDICINE
Graduated 1995 (31 years in practice)
Group practice Mountainstar Cardiology St Marks Llc — 42 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

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