NOTICE: Office Closing May 15th 2020

Home / Doctors / Colon And Rectal Surgery / Brian J. McGuinness MD, FACS

Brian J. McGuinness

MD, FACS

Cardiology & Internal Medicine
Colon And Rectal Surgery
Antioch office
Sinus Center office
925-274-9004
Walnut Creek office
Internal Medicine office
Texting appointment line: 925-395-4023
Currently Not Accepting New Patients
Currently Not Accepting New Patients
Currently Not Accepting New Patients
Currently Not Accepting New Patients

Main Office

365 Lennon Lane Suite 290 Walnut Creek, CA 94598
2400 Balfour Road Suite 300
Brentwood, CA 94513

Affiliations

John Muir Health Walnut Creek Medical Center
John Muir Health Concord Medical Center

Sub-specialties

Advanced  Laparoscopic

About

Dr. McGuinness is double board certified by The American Boards of Surgery and Colon & Rectal Surgery. Dr. McGuinness is the current Chair of Surgery at the John Muir Medical Center in Walnut Creek and a past Chair of Surgery at the John Muir Concord Campus Medical Center. He serves as the Surgical Physician Advisor to John Muir’s peer review Professional Practice Evaluation Committee. He was a recipient of various grants and awards in the fields of research and teaching during his training. Dr. McGuinness is a Fellow of The American College of Surgeons and member of The American Society of Colon & Rectal Surgeons, Alameda & Contra Costa Medical Association; Northern California Society of Colon & Rectal Surgeons and the Northwestern Society of Colon & Rectal Surgeons. He has also served as a preceptor for instructing surgeons nationally in laparoscopic and minimally invasive techniques in colon and rectal surgery. His interest is infectious, inflammatory, and neoplastic disorders of the intestines, colon, rectum, and anus. Dr. Brian J. McGuinness joined Bay Area Colon & Rectal Surgeons in August, 2003. He was born and raised in Boston, Massachusetts.

Dr. Audrey "Lisa" Arzamendi is double board-certified in internal medicine and endocrinology. Since 2012, she has specialized in diabetes, obesity and metabolism, thyroid disease (including Hashimoto's and Graves'), polycystic ovary syndrome (PCOS) and sex hormone disorders, adrenal and pituitary dysfunction, osteoporosis, parathyroid/calcium disorders, and thyroid and parathyroid nodules and cancers. She is highly trained in ultrasound-guided fine-needle aspiration (FNA) biopsy of the thyroid (99% diagnostic rate).

Dr. Arzamendi is committed to safe and established medical treatments, and prides herself on staying informed about emerging therapies and research-supported non-prescription options. She is experienced working with all forms of brand-name and generic thyroid medications, and as a type 1 diabetic herself, has first-hand knowledge of nearly all available prescription and technological diabetic treatments, to best support patients in selecting their optimal diabetes treatment regimens.

Dr. Arzamendi graduated with honors from Stanford University, with a BA in Human Biology and a concentration in Health & Human Performance.  She attended UC San Diego School of Medicine (receiving a federal NIH National Cancer Institute fellowship), and completed her internal medicine residency at Kaiser Pemanente’s Santa Clara Medical Center.  Her endocrinology training was completed at UC Davis Medical Center. She previously practiced in California's South Bay before relocating to open her practice in Walnut Creek in 2020. Dr. Arzamendi was a Stanford varsity athlete and still enjoys running, hiking, tennis, rowing, and other outdoor activities. She loves spending time with her husband and many pets, and looks forward to being your doctor!

Conditions Treated

  • Alternative and second opinions in surgical and non surgical conditions
  • Anal Abscess/Fistula
  • Anal Cancer
  • Anal Fissure
  • Anal Incontinence
  • Anal Warts
  • Anorectal Bleeding
  • Colonoscopy
  • Colon Cancer
  • Colorectal Cancer
  • Colorectal Cancer Screening
  • Colorectal Cancer Surgery
  • Constipation
  • Crohn's Disease
  • Diverticular Disease
  • Hemorrhoids
  • Inflammatory Bowel Disease
  • Ostomy
  • Pilonidal Disease
  • Polyps of the Colon & Rectum 
  • Pruritis - ani / anal itching 
  • Rectal Prolapse
  • Rectocele
  • Rectal Cancer
  • Ulcerative Colitis

Conditions Treated

  • Alternative and second opinions in surgical and non surgical conditions
  • Anal Abscess/Fistula
  • Anal Cancer
  • Anal Fissure
  • Anal Incontinence
  • Anal Warts
  • Anorectal Bleeding
  • Colonoscopy
  • Colon Cancer
  • Colorectal Cancer
  • Colorectal Cancer Screening
  • Colorectal Cancer Surgery
  • Constipation
  • Crohn's Disease
  • Diverticular Disease
  • Hemorrhoids
  • Inflammatory Bowel Disease
  • Ostomy
  • Pilonidal Disease
  • Polyps of the Colon & Rectum 
  • Pruritis - ani / anal itching 
  • Rectal Prolapse
  • Rectocele
  • Rectal Cancer
  • Ulcerative Colitis

Conditions Treated

  • Alternative and second opinions in surgical and non surgical conditions
  • Anal Abscess/Fistula
  • Anal Cancer
  • Anal Fissure
  • Anal Incontinence
  • Anal Warts
  • Anorectal Bleeding
  • Colonoscopy
  • Colon Cancer
  • Colorectal Cancer
  • Colorectal Cancer Screening
  • Colorectal Cancer Surgery
  • Constipation
  • Crohn's Disease
  • Diverticular Disease
  • Hemorrhoids
  • Inflammatory Bowel Disease
  • Ostomy
  • Pilonidal Disease
  • Polyps of the Colon & Rectum 
  • Pruritis - ani / anal itching 
  • Rectal Prolapse
  • Rectocele
  • Rectal Cancer
  • Ulcerative Colitis

Education

Medical School: Tulane University in New Orleans, Louisiana
Internship: General Surgery at the Ohio State University Medical Center in Columbus
Residency: General Surgery at the Ohio State University Medical Center in Columbus
Fellowship: Colon and Rectal Surgery at the University of Texas in Houston

Board Certification:

  • American Board of Surgery
  • American Board of Colon & Rectal Surgery

Special Procedures & Techniques:

  • Laparoscopic and minimally invasive techniques in colon & rectal surgery
  • Endoscopy

Media

For more information about BPH/enlarged prostate and the Urolift procedure, click the banner below:

Main Office

365 Lennon Lane Suite 290 Walnut Creek, CA 94598

Affiliations

John Muir Health Walnut Creek Medical Center
John Muir Health Concord Medical Center

Sub-specialties

Advanced  Laparoscopic

Patient Forms

Patient RegistrationHemorrhoid Self Care TipsPreparation for Flexible SigmoidoscopyPreparation for Rectal ExamHIPAANew Patient Packet

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