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

Dr. Sean M. O'Brien, DO

Individual provider Nephrology Physician · NPI 1912994500

Dr. Sean M. O'Brien, DO is an Internal Medicine in Nogales, Arizona. Graduated from At Still University of Health Sciences, College of Osteo Med, Kirksville in 1990, 36 years ago. Practices with Mariposa Community Health Center Inc, a 34-clinician group and accepts Medicare assignment. Licensed in Arizona.

Years since qualifying
36
Trained at
At Still University of Health Sciences, College of Osteo Med, Kirksville
Licensed in
AZ
In the registry since
2005
Specialties on file
2
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

See every abbreviation used in this directory →

Practice location Address checks out

3231 N Grand Ave
Nogales, AZ 85621-3905
Phone: (520) 281-1550
Fax: (520) 281-1112
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 2883 (AZ)
Nephrology Physician Taxonomy 207RN0300X · Licence 2883 (AZ)

Record details

NPI number1912994500
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedSeptember 29, 2005
Last updated in NPPESJanuary 17, 2024
Certification dateJanuary 17, 2024

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolAT STILL UNIVERSITY OF HEALTH SCIENCES, COLLEGE OF OSTEO MED, KIRKSVILLE
Graduated 1990 (36 years in practice)
Group practice Mariposa Community Health Center Inc — 34 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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