Doctor profile · Federal record
Dr. William Toppen, M.D.
Undersea and Hyperbaric Medicine (Emergency Medicine) Physician (CMS: Undersea and Hyperbaric Medicine) · Internal Medicine Physician · San Diego, CA
- NPI 1215399407
- Accepts Medicare
- 10 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 - Additional location
-
757 Westwood Plz
Los Angeles, CA 900957419
(310) 825-7417 - Additional location
-
9300 Campus Point Dr
La Jolla, CA 920371300 - Mailing address
-
File 57326
Los Angeles, CA 900747326
Credentials & registration
- NPI registered
- March 2016 — 10 yrs on file
- Profile last updated
- January 29, 2025
- Year of graduation
- 2016 — 10 yrs since
- Specialty taxonomy
- 207PE0005X — NUCC code
- State license (1)
- California #A155816
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1215399407. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
255
Distinct HCPCS
4
Medicare allowed
$29,199
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 116 | 44 | $83 | |
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 79 | 42 | $125 | |
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 40 | 40 | $180 | |
99239 |
Hospital discharge day management, more than 30 minutes | 20 | 20 | $122 |
In context: peer comparison
Among 2 peers in this city , average services per provider: 78. This provider delivers 3.3× the peer median.Hospital affiliations
Frequently asked questions
What is Dr. William Toppen's medical specialty?
Dr. William Toppen practices Undersea and Hyperbaric Medicine (Emergency Medicine) Physician in San Diego, CA.
Where does Dr. William Toppen practice?
Dr. William Toppen practices at 200 W Arbor Dr, San Diego, CA 921039000. Office phone: 8009268273.
What is Dr. William Toppen's NPI?
Dr. William Toppen's National Provider Identifier (NPI) is 1215399407, issued by NPPES.
Does Dr. William Toppen accept Medicare assignment?
Yes. Dr. William Toppen accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. William Toppen commonly perform?
Top Medicare-reported procedures in 2023: Subsequent hospital care with moderate levelof medical decision making (HCPCS 99232); Subsequent hospital care with moderate levelof medical decision making (HCPCS 99233); Initial hospital care with moderate level of medical decision making (HCPCS 99223). Source: CMS Medicare Physician & Other Practitioners file.