Mark Richard Brown, FNP-C – Family Nurse Practitioner

Key facts

NPI: 1346053048
Entity type: Individual (NPI type 1)
Primary specialty: Family Nurse Practitioner 363LF0000X
License: 95033749 (CA)
Practice address: 421 Nut Tree Rd
Vacaville, CA 95687-3508
Phone: (707) 624-7500
NPI assigned: Jan 28, 2025
Sex: Male
Sole proprietor: No

Organizations & group practices 1

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

Northbay Health Medical Foundation Internal Medicine Physician · Fairfield, CA · NPI 1760283527

Medicare reassignment Care Compare group CA

Hospital & facility affiliations 4

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

Northbay Healthcare Group General Acute Care Hospital · Fairfield, CA · NPI 1821147786

Care Compare affiliation Hospital
St. Helena Hospital General Acute Care Hospital · Saint Helena, CA · NPI 1720078082

Care Compare affiliation Hospital
St. Joseph Health Northern California, LLC General Acute Care Hospital · Napa, CA · NPI 1013080084

Care Compare affiliation Hospital
St. Joseph Health Northern California, LLC General Acute Care Hospital · Napa, CA · NPI 1235218785

Care Compare affiliation Hospital

Medicare Care Compare profile

Specialty: Nurse Practitioner
Education: Other, 2024
Medicare assignment: Accepts the Medicare-approved amount as payment in full
Telehealth: Offers telehealth services
Group practices: Northbay Health Medical Foundation (207 clinicians)

Practice addresses (Care Compare)

421 Nut Tree Rd
Vacaville, CA 95687-3508
Phone (707) 646-5500

Hospital & facility affiliations

Providence Queen of the Valley Medical Center Hospital · Napa, CA · CCN 050009
Northbay Medical Center Hospital · Fairfield, CA · CCN 050367
Adventist Health St Helena Hospital · Saint Helena, CA · CCN 050013

Medicare participation

Medicare fee-for-service enrollment: Enrolled in CA
Eligible to order & refer: Part B services: Yes · DME: Yes · Home health: Yes · Power mobility devices: Yes · Hospice: No

Medicare enrollment records

Enrollment ID	State	Provider type	PAC ID	Details
I20260410003325	CA	Practitioner - Nurse Practitioner	6901157502	Reassigns benefits to 1 organization

National Provider Directory

Medicare enrollment (NPD): Yes

Interoperability endpoints

Direct secure messaging: mark.brown.1@30147.direct.athenahealth.com

Specialties & licenses

Specialty (taxonomy)	Code	License	State	Primary
Family Nurse Practitioner	363LF0000X	95033749	CA	Yes

Addresses

Primary practice location

421 Nut Tree Rd
Vacaville, CA 95687-3508

Mailing address

421 Nut Tree Rd
Vacaville, CA 95687-3508
Phone (707) 624-7500

NPI Registry JSON

The complete NPPES record for this NPI in the NPI Registry API JSON format, last updated by the provider on May 12, 2026.

{
    "created_epoch": "1738022400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1778544000000",
    "number": "1346053048",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "421 NUT TREE RD",
            "city": "VACAVILLE",
            "state": "CA",
            "postal_code": "956873508",
            "telephone_number": "707-624-7500"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "421 NUT TREE RD",
            "city": "VACAVILLE",
            "state": "CA",
            "postal_code": "956873508",
            "telephone_number": "707-624-7500"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "BROWN",
        "first_name": "MARK",
        "middle_name": "RICHARD",
        "name_prefix": "Mr.",
        "credential": "FNP-C",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2025-01-28",
        "last_updated": "2026-05-12",
        "certification_date": "2026-05-12",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363LF0000X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner, Family",
            "state": "CA",
            "license": "95033749",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

Other providers in Vacaville, CA

All providers in Vacaville, CA · Family Nurse Practitioner in California

Sources for this page

NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Record last updated by the provider on May 12, 2026. Information in NPPES is self-reported and not verified by CMS.
NUCC Health Care Provider Taxonomy: specialty names.
Medicare Fee-For-Service Public Provider Enrollment (CMS/PECOS): enrollments, PAC IDs and benefit reassignments.
Order and Referring (CMS).
Medicare Care Compare provider data (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.