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

Dr. Mark Stuart Simmons, MD

Individual provider Internal Medicine Physician · NPI 1811092760

Dr. Mark Stuart Simmons, MD is an Internal Medicine in Tuscon, Arizona. Qualified in 1992, 34 years ago. Practices with Northwest Urgent Care LLC, a 71-clinician group and accepts Medicare assignment. Licensed in Colorado.

Years since qualifying
34
Licensed in
CO
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

3870 W River Rd #126
Tuscon, AZ 85741
Phone: (520) 219-6616
Fax: (970) 266-3660
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 37923 (CO)
Pediatrics Physician Taxonomy 208000000X · Licence 37923 (CO)

Record details

NPI number1811092760
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedSeptember 14, 2006
Last updated in NPPESSeptember 26, 2024
Mailing address6531 W. Antler Bend Pl, Marana, AZ 85658

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolOTHER
Graduated 1992 (34 years in practice)
Group practice Northwest Urgent Care Llc — 71 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations7 on file with Medicare

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