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ROBERT FREDERICK WARBURTON ARNP
NPI 1477021764
Nurse Practitioner - Psychiatric/Mental Health in Tustin, CA

Active since November 05, 2018PECOS Enrolled
250 W MAIN ST STE 101, TUSTIN, CA 92780(714) 461-4121(385) 900-1673 Get Directions Write a Review

NPPES record last updated: November 14, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Nov 14, 2025, May 11, 2025, Oct 4, 2019 and 1 more (4 updates tracked since 2018).

About Robert Frederick Warburton Arnp NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

ROBERT FREDERICK WARBURTON ARNP (NPI 1477021764) is an individual psychiatric/mental health provider in Tustin, California, licensed in California (95012975) and active in the NPI registry since November 2018. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1477021764
Entity TypeIndividualMale
Primary Taxonomy363LP0808X
Provider Legal NameROBERT FREDERICK WARBURTONCredential: ARNP
Location Address250 W MAIN ST STE 101Tustin, CA 92780-7717
Mailing Address250 W Main St Ste 101Tustin, CA 92780-7717 · (714) 461-4121 · Fax (385) 900-1673
Phone(714) 461-4121
Fax(385) 900-1673
Sole ProprietorNo
Enumeration DateNovember 5, 2018
Last NPPES UpdateNovember 14, 20254 updates tracked since enumeration
NPPES CertifiedNovember 14, 2025
✔ NPI 1477021764 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyNurse Practitioner · Psychiatric/Mental HealthPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363LP0808X
Licenses✔ Licensed in CA · 95012975✔ Licensed in WA · 61527591✔ Licensed in AZ · 294766
Also ListedNurse Practitioner · FamilyTaxonomy 363LF0000X · License ARNP9376910 (FL), 9376910 (CA)
250 W MAIN ST STE 101, Tustin, CA 92780
Open in Google Maps ↗

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include UnitedHealthcare.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Robert Frederick Warburton Arnp is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

2

Medicare enrollment records show Robert Warburton reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Grow Healthcare Group PC
337 mi
Mental Health
99 S ALMADEN BLVD STE 600
San Jose, CA 95113
  • Reassigned Medicare billing, California enrollment
  • 3,139 clinicians in this Medicare group
NPI 1154994846 (408) 402-4385
Grow Healthcare Group PA
2,313 mi
Mental Health
66 W FLAGLER ST STE 900
Miami, FL 33130
  • Reassigned Medicare billing, Arizona and Washington enrollments
  • 532 clinicians in this Medicare group
NPI 1245845932 (786) 244-7711

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 92780 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$96.36 typical visit price
range $62.96 – $187.60
Typical copayment $24.09 (range $15.74 – $46.90)
Most-billed visit code 99203
Established Patient
$109.96 typical visit price
range $20.84 – $153.61
Typical copayment $27.49 (range $5.21 – $38.40)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 6

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MERNA EISSA LMFT
Marriage & Family Therapist
250 W MAIN ST STE 101
TUSTIN, CA 92780
Orange County (949) 667-3125
HEATHER BRIDGE LMFT
Marriage & Family Therapist
250 W MAIN ST STE 101
TUSTIN, CA 92780
Orange County (714) 644-1988
NATALIE ASAWESNA INDIVIDUAL AND MARRIAGE THERAPY INC
Marriage & Family Therapist
250 W MAIN ST STE 101
TUSTIN, CA 92780
Orange County (562) 507-1751
NATALIE ASAWESNA LMFT
Marriage & Family Therapist
250 W MAIN ST STE 101
TUSTIN, CA 92780
Orange County (562) 507-1751
LISA PEARSON
Marriage & Family Therapist
250 W MAIN ST STE 101
TUSTIN, CA 92780
Orange County (949) 202-6024
BRIDGE 2 HAPPINESS
Marriage & Family Therapist
250 W MAIN ST STE 101
TUSTIN, CA 92780
Orange County (714) 644-1988

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Robert Warburton's NPI number?

The NPI number for Robert Warburton is 1477021764. It was assigned to this individual provider in the NPPES registry on November 5, 2018.

Where is Robert Warburton located?

Robert Warburton practices at 250 W Main St Ste 101, Tustin, CA 92780. The listed phone number is (714) 461-4121.

What is Robert Warburton's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Psychiatric/Mental Health, with taxonomy code 363LP0808X.

Is Robert Warburton enrolled in Medicare?

Yes. Robert Warburton is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Robert Warburton's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Robert Warburton reassigns Medicare benefits to 2 organizations: Grow Healthcare Group PC (San Jose, CA) and Grow Healthcare Group PA (Miami, FL). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Robert Warburton's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Robert Warburton accept?

Health plans from UnitedHealthcare list Robert Warburton as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Robert Warburton was last updated on November 14, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.