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

Dr. Oluwaseyi Segun Balasire, MD

Individual provider Internal Medicine Physician · NPI 1003235243

Dr. Oluwaseyi Segun Balasire, MD is an Internal Medicine in Castro Valley, California. Qualified in 2009, 17 years ago. Practices with Sutter Bay Medical Foundation, a 3,762-clinician group, works from 3 locations and accepts Medicare assignment. Licensed in California and Tennessee.

Years since qualifying
17
Licensed in
CA, TN
In the registry since
2014
Specialties on file
3
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

20103 Lake Chabot Rd
Castro Valley, CA 94546-5305
Phone: (510) 727-3256
Fax: (510) 727-3107
Show map & directions

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

Additional practice locations (2)

  • 900 E Oak Hill Ave, Knoxville, TN 37917-4505 — (865) 545-8000
  • 1818 Albion St, Nashville, TN 37208-2918 — (615) 341-4000

Specialties & licences

Hospitalist Physician (primary) Taxonomy 208M00000X · Licence A152926 (CA)
Internal Medicine Physician Taxonomy 207R00000X · Licence 1118626 (CA)
Internal Medicine Physician Taxonomy 207R00000X · Licence 56261 (TN)

Record details

NPI number1003235243
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 15, 2014
Last updated in NPPESMarch 7, 2023

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Also practisesHOSPITALIST
Medical schoolOTHER
Graduated 2009 (17 years in practice)
Group practice Sutter Bay Medical Foundation — 3762 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations5 on file with Medicare

Other providers in Castro Valley