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

Dr. Brian Joseph McGuinness, MD

Individual provider Colon & Rectal Surgery Physician · NPI 1891870770

Dr. Brian Joseph McGuinness, MD is a Colorectal Surgery (Proctology) in Walnut Creek, California. Graduated from Tulane University School of Medicine in 1995, 31 years ago. Practices with Bass Medical Group, a 292-clinician group and offers telehealth. Licensed in California.

Years since qualifying
31
Trained at
Tulane University School of Medicine
Licensed in
CA
In the registry since
2006
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

365 Lennon Ln Ste 290
Walnut Creek, CA 94598-5910
Phone: (925) 274-9000
Fax: (925) 274-9004
Show map & directions

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

Specialties & licences

Colon & Rectal Surgery Physician (primary) Taxonomy 208C00000X · Licence A83195 (CA)

Record details

NPI number1891870770
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedOctober 26, 2006
Last updated in NPPESFebruary 26, 2025
Certification dateFebruary 26, 2025

Medicare enrollment

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

Medicare specialtyCOLORECTAL SURGERY (PROCTOLOGY)
Also practisesCRITICAL CARE (INTENSIVISTS)
Medical schoolTULANE UNIVERSITY SCHOOL OF MEDICINE
Graduated 1995 (31 years in practice)
Group practice Bass Medical Group — 292 clinicians
Accepts Medicare assignment Not indicated
TelehealthOffers telehealth services
Practice locations5 on file with Medicare

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