Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

MICHAEL MARSHALL APRN, PMHNP
NPI 1245563543
Nurse Practitioner - Psychiatric/Mental Health in Ontario, CA

Q: What is Michael Marshall's NPI number?

The NPI number for Michael Marshall is 1245563543. It was assigned to this individual provider in the NPPES registry on September 17, 2009.

Q: What is Michael Marshall's specialty?

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

Q: When was this NPI record last updated?

The NPPES record for Michael Marshall was last updated on September 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 33 days 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.

Active since September 17, 2009PECOS Enrolled

3200 E GUASTI RD, ONTARIO, CA 91761(909) 755-6610(909) 385-3335 Get Directions Write a Review

NPPES record last updated: September 29, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Sep 29, 2026, Jul 30, 2024, Dec 5, 2023 and 1 more (4 updates tracked since 2018).

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About Michael Marshall Aprn, Pmhnp NPPES

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

MICHAEL MARSHALL APRN, PMHNP (NPI 1245563543) is an individual psychiatric/mental health provider in Ontario, California, licensed in California (95028122) and active in the NPI registry since September 2009. He is enrolled in Medicare PECOS and maintains a secondary practice location in Fontana.

NPPES Registry Identity

NPI1245563543

Entity TypeIndividualMale

Primary Taxonomy363LP0808X

Provider Legal NameMICHAEL MARSHALLCredential: APRN, PMHNP

Location Address3200 E GUASTI RDOntario, CA 91761-8660

Mailing Address3200 E Guasti RdOntario, CA 91761-8660 · (909) 755-6610 · Fax (909) 385-3335

Phone(909) 755-6610

Fax(909) 385-3335

Sole ProprietorNo

Enumeration DateSeptember 17, 2009

Last NPPES UpdateSeptember 29, 20264 updates tracked since enumeration

NPPES CertifiedFebruary 24, 2026

✔ NPI 1245563543 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

License✔ Licensed in CA · 95028122

Also ListedRegistered NurseTaxonomy 163W00000X · License 679231 (CA)

3200 E GUASTI RD, Ontario, CA 91761

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Secondary Practice Location 1

Location 114677 Merrill AveFontana, CA 92335-4219 · Phone (951) 643-2340

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Michael Marshall Aprn, Pmhnp 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 Reassignment

Medicare enrollment records show Michael Marshall reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Grow Healthcare Group PC

331 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

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 91761 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

$91.88 typical visit price

range $59.60 – $179.42

Typical copayment $22.97 (range $14.90 – $44.85)

Most-billed visit code 99203

Established Patient

$104.64 typical visit price

range $19.37 – $146.42

Typical copayment $26.16 (range $4.84 – $36.60)

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 14

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

JAIR WALKER

Behavior Technician

3200 E GUASTI RD
ONTARIO, CA 91761

San Bernardino County (909) 240-2565

CHESTER T GREGSON

Marriage & Family Therapist

3200 E GUASTI RD
ONTARIO, CA 91761

San Bernardino County (619) 639-9730

4 U MEDICAL TRANSIT

Non-emergency Medical Transport (VAN)

3200 E GUASTI RD, SUITE 100
ONTARIO, CA 91761

San Bernardino County (844) 243-9988

MARSHALL ADVANCED NURSING PRACTICE PC

Nurse Practitioner (Psychiatric/Mental Health)

3200 E GUASTI RD
ONTARIO, CA 91761

San Bernardino County (909) 755-6610

RAVEN NALIKA ROSE LMFT

Marriage & Family Therapist

3200 E GUASTI RD
ONTARIO, CA 91761

San Bernardino County (909) 295-5805

KRISTOFER R ANDERSON MFT

Marriage & Family Therapist

3200 E GUASTI RD, SUITE 100-42
ONTARIO, CA 91761

San Bernardino County (909) 262-1768

JAYCEE L BARHAM

Behavior Technician

3200 E GUASTI RD
ONTARIO, CA 91761

San Bernardino County (909) 240-2565

MARIA VARGAS LICENSED CLINICAL SOCIAL WORKER

Counselor (Mental Health)

3200 E GUASTI RD
ONTARIO, CA 91761

San Bernardino County (909) 963-6730

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 Michael Marshall's NPI number?

The NPI number for Michael Marshall is 1245563543. It was assigned to this individual provider in the NPPES registry on September 17, 2009.

Where is Michael Marshall located?

Michael Marshall practices at 3200 E Guasti Rd, Ontario, CA 91761. The listed phone number is (909) 755-6610.

What is Michael Marshall's specialty?

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

Is Michael Marshall enrolled in Medicare?

Yes. Michael Marshall is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Michael Marshall's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Michael Marshall reassigns Medicare benefits to Grow Healthcare Group PC (San Jose, CA). The 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 Michael Marshall's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Michael Marshall was last updated on September 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 33 days 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.