Doctor profile · Federal record
Dr. Thomas Hemmen, M.D./PH.D
Vascular Neurology Physician (CMS: Neuropsychiatry) · Neurology Physician · San Diego, CA
- NPI 1902821945
- Accepts Medicare
- 32 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
Operates at 3 locations .
- Primary practice
-
200 W Arbor Dr
San Diego, CA 921039000
(800) 926-8273
fax (888) 539-8781 - Additional location
-
6655 Alvarado RD
San Diego, CA 921205208 - Additional location
-
9350 Campus Point Dr
La Jolla, CA 920371300 - Mailing address
-
File 57326
Los Angeles, CA 900747326
Credentials & registration
- NPI registered
- July 2006 — 20 yrs on file
- Profile last updated
- July 23, 2024
- Year of graduation
- 1994 — 32 yrs since
- Specialty taxonomy
- 2084V0102X — NUCC code
- State license (1)
- California #A72645
- Medicaid
- CA #00A726450
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1902821945. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
249
Distinct HCPCS
6
Medicare allowed
$33,516
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 117 | 62 | $123 | |
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 74 | 72 | $179 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 19 | 19 | $101 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 14 | 13 | $68 | |
99215 |
Established patient office or other outpatient visit, 40-54 minutes | 13 | 13 | $149 | |
99203 |
New patient office or other outpatient visit, 30-44 minutes | 12 | 12 | $85 |
In context: peer comparison
Among 2 peers in San Diego Vascular Neurology Physician, average services per provider: 60. This provider delivers 4.2× the peer median.Open Payments
Industry payments received
All-time total
$33
Transactions
1
Manufacturers
1
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Genentech USA, INC. | 1 | $33.33 |
By nature of payment
Hospital affiliations
Frequently asked questions
What is Dr. Thomas Hemmen's medical specialty?
Dr. Thomas Hemmen practices Vascular Neurology Physician in San Diego, CA.
Where does Dr. Thomas Hemmen practice?
Dr. Thomas Hemmen practices at 200 W Arbor Dr, San Diego, CA 921039000. Office phone: 8009268273.
What is Dr. Thomas Hemmen's NPI?
Dr. Thomas Hemmen's National Provider Identifier (NPI) is 1902821945, issued by NPPES.
Does Dr. Thomas Hemmen accept Medicare assignment?
Yes. Dr. Thomas Hemmen accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Thomas Hemmen commonly perform?
Top Medicare-reported procedures in 2023: Subsequent hospital care with moderate levelof medical decision making (HCPCS 99233); Initial hospital care with moderate level of medical decision making (HCPCS 99223); Established patient office or other outpatient visit (HCPCS 99214). Source: CMS Medicare Physician & Other Practitioners file.