Oakstone Psychiatric Practice

Welcome to Oakstone Psychiatric Practice

"Rooted in Compassion. Grounded in Expertise."

Delivering comprehensive, evidence-based psychiatric care across all stages of life—adults, adolescents, and children—in Visalia and California's Central Valley.

Oakstone Psychiatric Practice Team
Our Dedicated Team

Providing compassionate, patient-centered care in a serene and welcoming environment.

Meet Clinical Team
Our Practice Overview

Rooted in Compassion.
Grounded in Expertise.

Founded by a board-certified psychiatrist who has cared for patients and families throughout Visalia and California's Central Valley for more than a decade, Oakstone Psychiatric Practice combines academic expertise with personalized, compassionate care.

At Oakstone Psychiatric Practice, we believe exceptional psychiatric care begins with clinical excellence, thoughtful relationships, and an unwavering commitment to doing what is right for every patient.

Oakstone Psychiatric Practice Emblem

Integrity • Compassion • Excellence

Evidence-Based Medicine

Our treatment recommendations are grounded in the latest psychiatric research, established clinical guidelines, and years of physician expertise.

Personalized Care

Every treatment plan is thoughtfully tailored to the individual, recognizing that exceptional outcomes begin with understanding each patient's unique circumstances.

Comprehensive Care

From childhood through adulthood, we provide coordinated psychiatric services, partnering with families and primary care physicians for whole-person health.

Expert Clinical Leadership

Our Co-founders

Our board-certified specialists and experienced clinical staff work collaboratively to provide empathetic, high-quality care across all ages.

Cory Daniel Jaques, M.D.
Medical Director & Co-founder

Cory Daniel Jaques, M.D.

Board-Certified Adult, Child & Adolescent Psychiatrist

Dr. Cory Daniel Jaques is the co-founder and Medical Director of Oakstone Psychiatric Practice, where he leads a team of dedicated psychiatric clinicians committed to delivering exceptional, evidence-based mental health care throughout Visalia and California's Central Valley.

After earning his medical degree from the University of Minnesota Medical School, Dr. Jaques completed both his General Psychiatry Residency and Child & Adolescent Psychiatry Fellowship at the UCLA Semel Institute for Neuroscience and Human Behavior, one of the nation's leading centers for psychiatric education and research.

For more than a decade, Dr. Jaques has provided psychiatric care to children, adolescents, and adults across the Central Valley. In addition to leading Oakstone Psychiatric Practice, he serves as Program Director of the Child & Adolescent Psychiatry Fellowship and Medical Director of the Youth Crisis Stabilization Unit.

Dr. Jaques believes the best psychiatric care is built on thoughtful evaluation, genuine human connection, and individualized treatment.

April Ortiz, PMHNP-BC
Co-founder

April Ortiz, PMHNP-BC

Board-Certified Psychiatric Mental Health Nurse Practitioner

April Ortiz is a co-founder and board-certified Psychiatric Mental Health Nurse Practitioner at Oakstone Psychiatric Practice with many years of experience providing compassionate, evidence-based psychiatric care across Visalia and the Central Valley.

At Oakstone, April provides comprehensive psychiatric evaluations, medication management, and individualized treatment across the lifespan for adults, adolescents, and children experiencing a wide range of mental health conditions.

Working closely with Dr. Cory Daniel Jaques, April practices within the clinical philosophy that defines Oakstone: delivering personalized, ethical, and evidence-based psychiatric care with professionalism, compassion, and respect.

April is passionate about helping patients and families navigate life's challenges with confidence, resilience, and hope, creating a welcoming environment where every patient feels heard and respected.

Clinical & Administrative Team

Our supportive care team is dedicated to providing warm, professional, and seamless support at every stage of your care.

Darius Mendoza, PMHNP-BC
Darius Mendoza, PMHNP-BC

Board-Certified Psychiatric-Mental Health Nurse Practitioner

Darius Mendoza, PMHNP-BC, is a Board-Certified Psychiatric-Mental Health Nurse Practitioner and a vital member of the Oakstone Psychiatric Practice team. Bringing extensive specialized experience from his time as an acute psychiatric charge nurse and provider at Kaweah Health’s Youth Crisis Stabilization Unit, Darius excels in guiding individuals and families through complex mental health challenges. At Oakstone, he combines clinical leadership with a deeply empathetic approach to care. He is dedicated to creating a safe, supportive environment where patients receive the evidence-based psychiatric treatment and personalized support they need to achieve lasting stability and wellness.

Flor Santos
Flor Santos

Certified Medical Assistant, Office Manager & Patient Care Specialist

Flor Santos serves as Office Manager, Certified Medical Assistant, and Patient Care Specialist at Oakstone Psychiatric Practice. With her extensive clinical support background and exceptional organizational leadership, Flor ensures that every patient and family receives a seamless, warm, and supportive experience from their very first interaction. Her dedication to compassionate service, efficient clinic administration, and thoughtful patient navigation makes her an invaluable pillar of the Oakstone care team.

Visit Our Office

Location

3435 South Demaree Ave, Ste C
Visalia, CA 93277

Get Directions

Phone & Fax

Phone: (559) 258-1644
Fax: (559) 258-1624

Office Hours

Monday – Friday: 8:00 AM – 5:00 PM
Saturday – Sunday: Closed

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