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

Frank Castillo Jr., NP

Individual provider Acute Care Nurse Practitioner · NPI 1639623770

Frank Castillo Jr., NP is a Nurse Practitioner in Walnut Creek, California. Qualified in 2016, 10 years ago. Practices with John Muir Physician Network, a 486-clinician group, accepts Medicare assignment and offers telehealth. Licensed in California.

Years since qualifying
10
Licensed in
CA
In the registry since
2016
Specialties on file
2
What do these letters mean?
NP — Nurse Practitioner
An advanced practice nurse who can diagnose, treat and in most states prescribe.

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Practice location Address checks out

100 N Wiget Ln Ste 290
Walnut Creek, CA 94598-5901
Phone: (925) 937-7740
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Nurse Practitioner (primary) Taxonomy 363L00000X · Licence 95004634 (CA)
Acute Care Nurse Practitioner Taxonomy 363LA2100X · Licence 95004634 (CA)

Record details

NPI number1639623770
Entity typeIndividual (Type 1)
GenderMale
Credentials NP
Sole proprietorYes
NPI enumeratedAugust 5, 2016
Last updated in NPPESSeptember 22, 2025
Certification dateSeptember 22, 2025
Mailing address1450 Treat Blvd Ste 300, Walnut Creek, CA 94597-2168

Medicare enrollment

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

Medicare specialtyNURSE PRACTITIONER
Medical schoolOTHER
Graduated 2016 (10 years in practice)
Group practice John Muir Physician Network — 486 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

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