Doctor profile · Federal record
Dr. William Farnsworth, M.D.
Neurology Physician (CMS: Neurology) · Carlsbad, CA
- NPI 1669827028
- Accepts Medicare
- 10 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
Operates at 3 locations .
- Primary practice
-
6010 Hidden Valley RD Ste 200
Carlsbad, CA 920114219
(760) 631-3000
fax (760) 270-9534 - Additional location
-
1955 Citracado Pkwy Ste 102
Escondido, CA 920294111 - Additional location
-
31515 Rancho Pueblo RD Ste 104
Temecula, CA 925924837
Credentials & registration
- NPI registered
- May 2016 — 10 yrs on file
- Profile last updated
- September 10, 2025
- Year of graduation
- 2016 — 10 yrs since
- Specialty taxonomy
- 2084N0400X — NUCC code
- State license (1)
- California #A172324
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1669827028. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
7,488
Distinct HCPCS
10
Medicare allowed
$187,644
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
J0585 |
Injection, onabotulinumtoxina, 1 unit | 6,500 | 27 | $6 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 278 | 219 | $137 | |
99215 |
Established patient office or other outpatient visit, 40-54 minutes | 172 | 150 | $191 | |
99205 |
New patient office or other outpatient visit, 60-74 minutes | 121 | 121 | $232 | |
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 116 | 51 | $123 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 103 | 96 | $97 | |
G2212 |
Prolonged office or other outpatient evaluation and management service(s) beyond the maximum required time of the primary procedure which has been selected using total time on the date of the primary service; each additional 15 minutes by the physician or | 77 | 68 | $34 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 56 | 56 | $177 | |
64615 |
Injection of chemical for paralysis of facial and neck nerve muscles on both sides of face | 32 | 26 | $160 | |
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 22 | 22 | $179 |
In context: peer comparison
Among 9 peers in Carlsbad Neurology Physician, average services per provider: 1,345. This provider delivers 5.6× the peer median.Open Payments
Industry payments received
All-time total
$2,180
Transactions
103
Manufacturers
15
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Abbvie INC. | 35 | $827.38 | |
| Pfizer INC. | 15 | $163.76 | |
| Lundbeck LLC | 11 | $157.94 | |
| Acadia Pharmaceuticals INC | 8 | $136.91 | |
| Eisai INC. | 6 | $131.71 | |
| Neurocrine Biosciences, INC. | 4 | $97.56 | |
| Amneal Pharmaceuticals LLC | 4 | $91.06 | |
| Averitas Pharma INC. | 3 | $85.11 | |
| Grifols USA, LLC | 4 | $70.24 | |
| Lilly USA, LLC | 3 | $65.81 | |
| Neurelis, INC. | 3 | $61.00 | |
| Ucb, INC. | 3 | $60.41 | |
| Biogen, INC. | 2 | $46.92 | |
| Otsuka America Pharmaceutical, INC. | 1 | $29.77 | |
| Takeda Pharmaceuticals U.S.A., INC. | 1 | $24.56 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
991
Patients
270
Total drug cost
$220,385
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Memantine Hcl | Generic | 193 | 62 | $13,028 |
| Donepezil Hcl | Generic | 180 | 71 | $3,862 |
| Carbidopa-Levodopa (Carbidopa/Levodopa) | Brand | 120 | 36 | $6,839 |
| Gabapentin | Generic | 104 | 25 | $2,833 |
| Levetiracetam | Generic | 63 | 17 | $1,805 |
| Olanzapine | Generic | 60 | 17 | $5,247 |
| Quetiapine Fumarate | Generic | 50 | 11 | $1,441 |
| Atorvastatin Calcium | Generic | 43 | 19 | $693 |
| Nurtec Odt (Rimegepant Sulfate) | Brand | 42 | 12 | $59,135 |
| Divalproex Sodium | Generic | 29 | 0 | $2,376 |
Hospital affiliations
Frequently asked questions
What is Dr. William Farnsworth's medical specialty?
Dr. William Farnsworth practices Neurology Physician in Carlsbad, CA.
Where does Dr. William Farnsworth practice?
Dr. William Farnsworth practices at 6010 Hidden Valley RD Ste 200, Carlsbad, CA 920114219. Office phone: 7606313000.
What is Dr. William Farnsworth's NPI?
Dr. William Farnsworth's National Provider Identifier (NPI) is 1669827028, issued by NPPES.
Does Dr. William Farnsworth accept Medicare assignment?
Yes. Dr. William Farnsworth accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. William Farnsworth commonly perform?
Top Medicare-reported procedures in 2023: Injection, onabotulinumtoxina, 1 unit (HCPCS J0585); Established patient office or other outpatient visit (HCPCS 99214); Established patient office or other outpatient visit (HCPCS 99215). Source: CMS Medicare Physician & Other Practitioners file.