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

Dr. Sarah Johanna Carstens, MD

Individual provider Internal Medicine Physician · NPI 1952506867

Dr. Sarah Johanna Carstens, MD practises Internal Medicine in Phoenix, Arizona. Graduated from University of Arizona College of Medicine in 2007, 19 years ago. Practices with Circle the City, a 63-clinician group and accepts Medicare assignment. Licensed in Arizona.

Years since qualifying
19
Trained at
University of Arizona College of Medicine
Licensed in
AZ
In the registry since
2007
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

1111 E McDowell Rd
Phoenix, AZ 85006-2612 Not confirmed with CMS for 11 years — call before visiting
Phone: (602) 000-0000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 226718 (AZ)
Hospitalist Physician Taxonomy 208M00000X · Licence 43273 (AZ)

Record details

NPI number1952506867
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorYes
NPI enumeratedJune 19, 2007
Last updated in NPPESSeptember 27, 2015

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolUNIVERSITY OF ARIZONA COLLEGE OF MEDICINE
Graduated 2007 (19 years in practice)
Group practice Circle The City — 63 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 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 patients15
Services billed 15 a service is one billed item, such as a visit, a test or a procedure
Average patient age71

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.

Colleagues at Circle the City

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 63 clinicians in the practice; 11 are shown here.

Other providers in Phoenix