William Benjamin Farnsworth, M.D.
Neurology Physician · Carlsbad, CA
William Benjamin Farnsworth, M.D. is a neurology physician with a practice address in Carlsbad, California, and NPI 1669827028, issued on May 4, 2016. Check the license (California A172324, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William Benjamin Farnsworth
- Credential
- M.D.
- Primary taxonomy
- Neurology Physician 2084N0400X
- License number
- A172324 CA
Self-reported in NPPES; status is on the state search - Practice location
- 6010 Hidden Valley RD Ste 200, Carlsbad, CA 92011
- Phone
- (760) 631-3000
- Enumerated
- May 4, 2016
- Record last updated
- May 14, 2026
- Fax
- (760) 270-9534
- Medicare enrollment
- Enrolled (PECOS I20210609002302); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest neurology physician records → All 2,339 in California → Look up another NPI →
Also registered at 6010 Hidden Valley RD Ste 200
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Lori Alasantro, PHDClinical Neuropsychologist1669807111
- David Baker, DONeurology Physician1316442296
- Julienne BaughFamily Nurse Practitioner1114746088
- Christopher Bo, MDPhysical Medicine & Rehabilitation Physician1952863052
- Alicia Choquette, PAPhysician Assistant1710118617
- Bilal Choudry, M.D.Neurology Physician1396921144
Verify William Benjamin Farnsworth in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A172324Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
22% more Medicare Part D claims than the average neurology physician in 2024
1,678 Medicare Part D claims for 370 beneficiaries, against an average of 1,370 among the 15,005 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims.
Most prescribed
- Memantine Hcl328 claims
- Donepezil Hcl239 claims
- Carbidopa-Levodopa168 claims
- Gabapentin95 claims
- Quetiapine Fumarate93 claims
- Levetiracetam86 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $2,179.76
110 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 10,858 providers of this specialty with any payment received $8,318.07 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- North County Neurology Associates Medical GroupEscondido, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William Benjamin Farnsworth among 2,339 neurology physician records in California
William Benjamin Farnsworth, M.D. is one of 2,339 neurology physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2016, is newer than 78% of them.
- NPI issued2016 · 78% of these records are older, 19% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 70% of these records are
- Graduated2016 · median 2006 among the 1,628 with a school on file
- Record last updated2026 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084N0400X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
28 neurology physician records list a practice address in Carlsbad
They are 28 of the 3,411 NPPES records with a practice address in Carlsbad, and 2,339 neurology physician records in California.
All 2,339 in California → Every provider in Carlsbad → Neurology Physician nationwide →
The 8 neurology physician records with the nearest ZIP codes
- Bilal Choudry, M.D.Carlsbad, CA 920111396921144
- Laura Desadier, D.O.Carlsbad, CA 920111245487982
- Brian Droker, MDCarlsbad, CA 920111801112669
- Benjamin Frishberg, M.D.Carlsbad, CA 920111952346348
- Gary Gualberto, M.D.Carlsbad, CA 920111689875668
- Michael Lobatz, M.D.Carlsbad, CA 920111619912078
- Irene Oh, M.D.Carlsbad, CA 920111306089008
- Remia Paduga, MDCarlsbad, CA 920111194933853
Common questions
What is William Benjamin Farnsworth, M.D.'s NPI number?
William Benjamin Farnsworth, M.D.'s National Provider Identifier (NPI) is 1669827028, issued on May 4, 2016. An NPI identifies a provider in billing; it is not a license.
Where is William Benjamin Farnsworth, M.D. located?
The NPPES record lists a practice address at 6010 Hidden Valley RD Ste 200, Carlsbad, CA, 92011. Phone: (760) 631-3000. Providers update this record themselves, so call before visiting.
How can I verify William Benjamin Farnsworth, M.D.'s license?
NPPES lists California license number A172324, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William Benjamin Farnsworth, M.D. prescribe under Medicare Part D?
In 2024, William Benjamin Farnsworth, M.D. had 1,678 Medicare Part D claims for 370 beneficiaries; the average among neurology physician prescribers was 1,370. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.