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

Dr. Erin Jo Mercer Terpstra, MD, PHD

Individual provider Student in an Organized Health Care Education/Training Program · NPI 1366005662

Dr. Erin Jo Mercer Terpstra, MD, PHD is an Internal Medicine in Sioux Falls, South Dakota. Qualified in 2019, 7 years ago. Practices with Sanford Medical Center, a 842-clinician group and accepts Medicare assignment. Licensed in South Dakota.

Years since qualifying
7
Licensed in
SD
In the registry since
2019
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.
PHD — Doctor of Philosophy
A research doctorate. In healthcare it usually sits alongside a clinical licence.

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Practice location Address checks out

Student / training record This NPI belongs to someone enrolled in a health care training programme. It carries no licence and no practice of its own, so no address or phone number is published for it.

Sioux Falls, SD

No coordinates on file. Search this address in Google Maps

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 13919 (SD)
Student in an Organized Health Care Education/Training Program Taxonomy 390200000X

Record details

NPI number1366005662
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD , PHD
Sole proprietorNo
NPI enumeratedApril 22, 2019
Last updated in NPPESDecember 20, 2022
Certification dateDecember 20, 2022

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolOTHER
Graduated 2019 (7 years in practice)
Group practice Sanford Medical Center — 842 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations4 on file with Medicare

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