About | Tri-Cities Precision Health

A peaceful gravel path lined with blooming lavender in the golden light of the Tri-Cities hills

Rosita Walker, MSN, ARNP, FNP-BC · Founder

A nurse practitioner who listens first.

Rosita is a board-certified Family Nurse Practitioner with advanced training in integrative and precision medicine. She has practiced clinically throughout the United States, and spent years in busy conventional clinics where 15-minute visits made real care impossible — so she built a practice where every patient gets the time they deserve.

Her focus is on whole-person primary care: careful listening, thoughtful diagnostics, and treatment plans built collaboratively with each patient. She holds advanced certifications in medical ozone therapy, EBOO, and wound care, and continues to train in precision diagnostics and regenerative pain management.

Master of Science in Nursing (MSN)
Family Nurse Practitioner — Board Certified (FNP-BC)
Advanced Registered Nurse Practitioner — licensed in Washington, Texas & Arizona
Certified by the American Academy of Ozonotherapy (AAOT)
EBOO certified
Certified in wound care
Clinical experience across multiple states in the U.S.
Bilingual — English & Spanish

Meet the team

The people behind your care.

A small, hand-picked team that knows your name, your history, and your goals.

A red barn with a pickup truck and a field of blooming lilies in the soft morning light of Walla Walla, Washington

Marcia Napier, MA-C, CPT, IV-C, FNC

Clinical Operations Coordinator

Marcia is a healthcare professional with experience in medical assisting, phlebotomy, IV therapy, and functional nutrition counseling. She brings a strong focus on supporting patients through thoughtful, practical, and individualized care — and on creating a welcoming environment where patients feel heard.

Working under Rosita's direction, she helps keep the clinic running smoothly — from lab coordination and IV support to functional nutrition guidance and day-to-day patient flow. She combines hands-on clinical skills with an interest in whole-person wellness and thoughtful practice operations.

Certified Medical Assistant (MA-C)
Certified Phlebotomy Technician (CPT)
Certified in IV therapy (IV-C)
Functional Nutrition Counselor (FNC)

Working together for you

A small team, on purpose.

You'll see the same faces every visit. That's how we build the kind of trust that makes precision medicine actually work — because a plan is only as good as the relationship behind it.

Consistent providers & support staff
Coordinated labs, IVs, and follow-up
Personalized nutrition & wellness guidance
Clear communication between every visit

Our philosophy

Precision medicine, with a human center.

Precision medicine means using the best available diagnostics and personalized protocols. But precision without relationship is just data. We combine the two — modern testing, evidence-informed protocols, and a provider who genuinely knows you.

Unhurried. 45–60 minute visits are the norm, not the exception.
Independent. No corporate quotas. No 15-minute cattle calls.
Integrative. Conventional primary care combined with integrative tools when they help.
Transparent. Clear membership pricing. No surprise bills.

Practice highlights

45–60min per visit

Same-weekappointments

Cash-payno insurance hassle

Localindependent & Tri-Cities based

Billing & insurance

Cash-pay — with superbills for your insurance.

We're a direct-pay practice, so there's no insurance runaround. On request, we provide a detailed superbill — an itemized receipt with diagnosis (ICD-10) and procedure (CPT) codes — that you can submit to your insurer for possible out-of-network reimbursement. We accept HSA and FSA, and membership pricing is always clear and upfront.

See how billing & superbills work