231 E. Caldwell Ave. - Visalia, Ca 93277
(559) 622-9800



Welcome to ICC Visalia

Immediate Care Center is known for service, and patient care. Since 2009, we have helped thousands of patients and have become known as one of Visalia’s leading medical clinics. Our providers, medical assistants, and support staff are all focused on giving our patients the best service, making you feel welcomed when you’re here with us.


You don’t need an appointment to be seen. We are open Monday – Saturday, and welcome you to come in to visit us. Our team is ready to help you.


We provide convenient health services for the entire family. Our team will meet your preventative care needs, and help when unplanned medical visits arise.


We are a top-rated medical facility that cares about our patients.

SINCE 2009

We have helped thousands, and our experience and expertise is top-notch.

Practice Philosophy:

Immediate Care Center believes in forging relationships with individuals to understand their health needs and goals while working collaboratively with each person to establish a plan to achieve their best possible state of health.


Marc Sizemore is a nationally certified nurse practitioner specializing in family practice. He completed both his Bachelor of Science degree and Master of Science at California State University, Bakersfield. Marc began his career in nursing in 2002 and has been a nurse practitioner since 2007. His previous experience includes work in the emergency room and family practice.


Valerie Sizemore is a nationally certified nurse practitioner specializing in family practice. She completed her Bachelor of Science degree in Psychobiology from University of California, Davis and then earned her Master of Science at California State University, Bakersfield. Valerie began her career in nursing in 2001 and has been a nurse practitioner since 2005. Her previous work experience encompasses both urgent care and emergency room practice as well as administration.

Your care is our top priority…

Our Team


Marc Sizemore NP-C

Nurse Practitioner

Valerie Sizemore NP-C

Nurse Practitioner & Administrator

Anthony Boxrud NP-C

Nurse Practitioner

Chad Applegate PA-C

Physician Assistant

Kay Gonzales PA-C

Physician Assistant

Michelle Kitson NP-C

Nurse Practitioner

Goodwill Princewill PA-C

Physician Assistant

Kristen Dickerson NP- C

Nurse Practitioner

Stefanie Absher NP-C

Nurse Practitioner

William Holvik MD

Medical Director

Administrative & Front/Back Office

Corina Lopez

Office & Billing Manager

Ginger Clark

Administrative Assistant

Chandler Darling

Billing Specialist & Receptionist

Laura Bobadilla

Billing Specialist & Receptionist

Lisa Ellison

Referral & Medical Records Specialist

Clariza Rodriguez

Medical Assistant

Chris Chambers

Medical Assistant

Maddi Clements

Medical Assistant

Anabel Rivera

Medical Assistant

Jazelle Tayo

Medical Assistant

Kaitlyn Tillery

Medical Assistant

Fatima Hernandez

Medical Assistant