James Willis Simmons II, NP

Primary specialty

Family Nurse PractitionerTaxonomy code 363LF0000X

License

NP19879 Issued in CA

Practice address

830 Jefferson Ave
Redwood City, CA 94063-1804

Phone

(650) 380-0616

NPI assigned

Nov 22, 2010

Last updated

Jan 16, 2026By the provider in NPPES

Sex

Male

Sole proprietor

Yes

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 1

Addresses

Medicare fee-for-service enrollment

Enrolled in CA

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: No

Green means eligible to order or refer.

Enrollment records 1

Specialty

Nurse Practitioner

Education

Other, 2010

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Merced Intensivist Group IncGroup PAC ID 9032535802, 9 clinicians

Inpatient Specialists of California PCGroup PAC ID 3476864448, 373 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Sutter Delta Medical Center Hospital, Antioch, CA, CCN 050523
• Mercy Medical Center Hospital, Merced, CA, CCN 050444
• Alta Bates Summit Medical Center - Alta Bates Camp Hospital, Berkeley, CA, CCN 050305
• Alta Bates Summit Medical Center Hospital, Oakland, CA, CCN 050043
• Dameron Hospital Hospital, Stockton, CA, CCN 050122

Medicare enrollment (NPD)

Enrolled

Credentials

Nurse Practitioner

State licenses

Practice roles

Locations (25 of 28)

Interoperability endpoints

• Direct secure messaging: james.simmons.p1@direct.cmcentersinc.nextgenshare.com

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

• Inpatient Specialists of California, PC

  • Internal Medicine Physician
  • San Bernardino, CA
  • NPI 1952792475
  Medicare reassignment Care Compare group NPD
• Merced Intensivist Group Inc

  • Critical Care Medicine (Internal Medicine) Physician
  • Merced, CA
  • NPI 1720604895
  Medicare reassignment Care Compare group NPD
• Baz Allergy, Asthma & Sinus Center, Inc.

  • Allergy Physician
  • Fresno, CA
  • NPI 1710906995
  Medicare reassignment NPD
• Solano Gateway Medical Group Inc

  • Emergency Medicine Physician
  • Fairfield, CA
  • NPI 1952344293

  Nurse Practitioner

  Medicare reassignment NPD
• UCSF Health Medical Foundation

  • Multi-Specialty Clinic/Center
  • Oakland, CA
  • NPI 1922124866
  Medicare reassignment NPD
• Vituity Hospitalists PC

  • Hospitalist Physician
  • Redding, CA
  • NPI 1730666108
  Medicare reassignment NPD
• Erx Hospitalist Group PC

  • Hospitalist Physician
  • Knoxville, TN
  • NPI 1699199562

  CA

  Medicare reassignment NPD
• Altamont Emergency Physicians Medical Group Inc

  • Emergency Medicine Physician
  • Tracy, CA
  • NPI 1952392375
  Medicare reassignment
• Surgical Associates Inc

  • Trauma Surgery Physician
  • Modesto, CA
  • NPI 1366824161
  Medicare reassignment
• Ripon Primary & Urgent Care Center a Medical Corporation

  • Multi-Specialty Clinic/Center
  • Ripon, CA
  • NPI 1477836245
  NPD (past) Authorized official
• Baz Allergy, Asthma & Sinus Center

  • Allergy Physician
  • Clovis, CA
  • NPI 1396328779
  NPD
• Baz Allergy, Asthma & Sinus Center, Inc.

  • Allergy Physician
  • Merced, CA
  • NPI 1114340528
  NPD

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

• Dameron Hospital Association

  • General Acute Care Hospital
  • Stockton, CA
  • NPI 1538163886
  Care Compare affiliation
• Dameron Hospital Association

  • Primary Care Clinic/Center
  • Stockton, CA
  • NPI 1699195115

  Hospital

  Care Compare affiliation
• Dignity Health

  dba Mercy Medical Center Merced

  • General Acute Care Hospital
  • Merced, CA
  • NPI 1518018191
  Care Compare affiliation
• Sutter Bay Hospitals

  dba Alta Bates Summit Medical Center - Summit Campus

  • General Acute Care Hospital
  • Oakland, CA
  • NPI 1295181477
  Care Compare affiliation
• Sutter Bay Hospitals

  dba Sutter Delta Medical Center

  • General Acute Care Hospital
  • Antioch, CA
  • NPI 1467808659
  Care Compare affiliation
• Sutter Bay Hospitals

  dba Alta Bates Summit Medical Center - Alta Bates Campus

  • General Acute Care Hospital
  • Berkeley, CA
  • NPI 1639523004
  Care Compare affiliation

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1290384000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1768521600000",
    "number": "1366744492",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "4405 WINCANTON RD",
            "city": "SALIDA",
            "state": "CA",
            "postal_code": "953689715",
            "telephone_number": "209-482-6840"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "830 JEFFERSON AVE",
            "city": "REDWOOD CITY",
            "state": "CA",
            "postal_code": "940631804",
            "telephone_number": "650-380-0616"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "103 Modesto Ave",
            "address_purpose": "LOCATION",
            "city": "Modesto",
            "state": "CA",
            "postal_code": "953540414",
            "country_code": "US",
            "telephone_number": "209-527-4597",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "SIMMONS",
        "first_name": "JAMES",
        "middle_name": "WILLIS",
        "name_suffix": "II",
        "credential": "NP",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2010-11-22",
        "last_updated": "2026-01-16",
        "certification_date": "2026-01-16",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363LF0000X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner, Family",
            "state": "CA",
            "license": "NP19879",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Jessica Sierra
• Sigal Tene,M.D. Inc.
• Stacey Signorello, MA, MFT
• Jacki L Silber, LMFT
• Sarah A Silverman, PSY.D.
• Katherine Ann Simon, O.D.
• Sachet S Simon
• Jacqueline Simoncini, RD CDE
• Kayla Mie Simonson
• John B. Simpson, M.D.

• Family Nurse Practitioner in Redwood City, CA
• Providers in Redwood City, CA by specialty
• Family Nurse Practitioner in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jan 16, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (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.