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

John F Grehan, MDPHD

Individual provider Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · NPI 1275549784

John F Grehan, MDPHD is a Thoracic Surgery in Sioux Falls, South Dakota. Graduated from University of Minnesota Medical School in 1995, 31 years ago. Practices with Sanford Clinic, a 273-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Ohio and South Dakota.

Years since qualifying
31
Trained at
University of Minnesota Medical School
Licensed in
OH, SD
In the registry since
2006
Specialties on file
2
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Practice location Address checks out

1301 W 18th St
Sioux Falls, SD 57105-0401
Phone: (605) 312-2100
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 225 N Smith Ave, St Paul, MN 55102 — (651) 241-7176

Specialties & licences

Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician (primary) Taxonomy 208G00000X · Licence 13118 (SD)
Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician Taxonomy 208G00000X · Licence 35.088377 (OH)

Record details

NPI number1275549784
Entity typeIndividual (Type 1)
GenderMale
Credentials MDPHD
Sole proprietorNo
NPI enumeratedAugust 1, 2006
Last updated in NPPESApril 9, 2022
Certification dateApril 9, 2022
Mailing addressPo Box 5074, Sioux Falls, SD 57117-5074

Medicare enrollment

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

Medicare specialtyTHORACIC SURGERY
Medical schoolUNIVERSITY OF MINNESOTA MEDICAL SCHOOL
Graduated 1995 (31 years in practice)
Group practice Sanford Clinic — 273 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Other providers in Sioux Falls