William Benjamin Farnsworth, M.D.

Primary specialty

Neurology PhysicianTaxonomy code 2084N0400X

License

A172324 Issued in CA

Practice address

6010 Hidden Valley Rd Ste 200
Carlsbad, CA 92011-4219

Phone

(760) 631-3000

Fax

(760) 270-9534

NPI assigned

May 4, 2016

Sex

Male

Sole proprietor

No

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: Yes

Green means eligible to order or refer.

Enrollment records 1

Specialty

Neurology

Education

Other, 2016

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Telehealth

Offers telehealth services

Group practices

North County Neurology Associates Medical GroupGroup PAC ID 5193625911, 45 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Tri-City Medical Center Hospital, Oceanside, CA, CCN 050128
• Scripps Memorial Hospital - Encinitas Hospital, Encinitas, CA, CCN 050503
• Palomar Medical Center Poway Hospital, Poway, CA, CCN 050636
• Palomar Health Downtown Campus Hospital, Escondido, CA, CCN 050115
• UC San Diego Health Hillcrest - Hillcrest Med Ctr Hospital, San Diego, CA, CCN 050025
• Tri-City Medical Center Inpatient rehabilitation facility, Oceanside, CA, CCN 05T128

Merit-based Incentive Payment System (MIPS)

Final score

84.58 of 100Reported as group

Quality

69.7

Promoting interoperability

100

Improvement activities

40

Cost

69.76

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Networks

• BSC 65 PLUS INDIVIDUAL MAPD

Interoperability endpoints

• Direct secure messaging: wfarnsworth736374@direct.med.umich.edu

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.

• North County Neurology Associates Medical Group

  • Neurology Physician
  • Carlsbad, CA
  • NPI 1003860537
  Medicare reassignment Care Compare group NPD
• North County Neurology Associates Medical Group

  • Neurology Physician
  • Oceanside, CA
  • NPI 1861418865
  NPD
• North County Neurology Associates Medical Group

  • Neurology Physician
  • Temecula, CA
  • NPI 1689275075
  NPD (past)
• Palomar Health

  • General Acute Care Hospital
  • Escondido, CA
  • NPI 1457321317
  NPD (past)
• Scripps Health

  • Clinical Medical Laboratory
  • La Jolla, CA
  • NPI 1427034990
  NPD (past)
• Scripps Health

  • General Acute Care Hospital
  • San Diego, CA
  • NPI 1659359446
  NPD (past)
• Temecula Valley Hospital Inc

  • General Acute Care Hospital
  • Temecula, CA
  • NPI 1679816201
  NPD (past)

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

• Palomar Health

  • General Acute Care Hospital
  • Poway, CA
  • NPI 1376513754
  Care Compare affiliation
• Palomar Health

  • General Acute Care Hospital
  • Escondido, CA
  • NPI 1457321317
  Care Compare affiliation
• Regents of the University of California

  • General Acute Care Hospital
  • San Diego, CA
  • NPI 1184722779
  Care Compare affiliation
• Scripps Health

  • General Acute Care Hospital
  • Encinitas, CA
  • NPI 1700829199
  Care Compare affiliation
• Tri-City Hospital

  • General Acute Care Hospital
  • Oceanside, CA
  • NPI 1801861190
  Care Compare affiliation
• Tri-City Hospital

  • Rehabilitation Hospital Unit
  • Oceanside, CA
  • NPI 1831164797

  Inpatient rehabilitation facility

  Care Compare affiliation

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

{
    "created_epoch": "1462320000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1778716800000",
    "number": "1669827028",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "6010 HIDDEN VALLEY RD STE 200",
            "city": "CARLSBAD",
            "state": "CA",
            "postal_code": "920114219",
            "telephone_number": "760-631-3000",
            "fax_number": "760-270-9534"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "6010 HIDDEN VALLEY RD STE 200",
            "city": "CARLSBAD",
            "state": "CA",
            "postal_code": "920114219",
            "telephone_number": "760-631-3000",
            "fax_number": "760-270-9534"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "31720 Temecula Pkwy Ste 101",
            "address_purpose": "LOCATION",
            "city": "Temecula",
            "state": "CA",
            "postal_code": "925925895",
            "country_code": "US",
            "telephone_number": "760-631-3000",
            "fax_number": "760-631-3016",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "1955 Citracado Pkwy Ste 102",
            "address_purpose": "LOCATION",
            "city": "Escondido",
            "state": "CA",
            "postal_code": "920294111",
            "country_code": "US",
            "telephone_number": "760-631-3000 x3",
            "fax_number": "760-270-9534",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "FARNSWORTH",
        "first_name": "WILLIAM",
        "middle_name": "BENJAMIN",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2016-05-04",
        "last_updated": "2026-05-14",
        "certification_date": "2026-05-14",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2084N0400X",
            "taxonomy_group": "",
            "desc": "Psychiatry & Neurology, Neurology",
            "state": "CA",
            "license": "A172324",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Bita Farhoumand, DDS
• Pamela Guadalupe Farias Balderas
• Jolene Farish, LCSW
• Jolene Antoinette Farley, DPT
• Jordan Jacob Farnan
• Glenn Lewis Farr, LCSW
• Mekayla Farr
• Griffen Burke Farrell
• Monica Farris
• Samantha Maria Fasolino, LMHC

• Neurology Physician in Carlsbad, CA
• Providers in Carlsbad, CA by specialty
• Neurology Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on May 14, 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.