William E. Toppen, M.D.
Undersea and Hyperbaric Medicine (Emergency Medicine) Physician · San Diego, CA
William E. Toppen, M.D. is an undersea and hyperbaric medicine (emergency medicine) physician with a practice address in San Diego, California, and NPI 1215399407, issued on Mar 25, 2016. Check the license (California A155816, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William E. Toppen
- Credential
- M.D.
- Primary taxonomy
- Undersea and Hyperbaric Medicine (Emergency Medicine) Physician 207PE0005X
- License number
- A155816 CA
Self-reported in NPPES; status is on the state search - Practice location
- 200 W Arbor Dr, San Diego, CA 92103
- Phone
- (800) 926-8273
- Enumerated
- Mar 25, 2016
- Record last updated
- Jan 29, 2025
- Medicare enrollment
- Enrolled (PECOS I20190605001316); accepts Medicare assignment
- Medical or professional school
- University Of California, Geffen School Of Medicine, 2016
- Entity
- Type 1 · individual
8 nearest undersea and hyperbaric medicine (emergency medicine) physician records → All 11 in California → Look up another NPI →
Also registered at 200 W Arbor Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Benjamin Abbadessa, M.D.Colon & Rectal Surgery Physician1255593612
- Geraldine Abcede, RNCertified Registered Nurse Anesthetist1982384046
- Joseph Abdelmalek, M.DNephrology Physician1740485531
- Kristy AbelCertified Registered Nurse Anesthetist1962113035
- Paula Abeleda, NPFamily Nurse Practitioner1558945022
Verify William E. Toppen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A155816Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
75% fewer Medicare Part D claims than the average undersea and hyperbaric medicine (emergency medicine) physician in 2024
94 Medicare Part D claims for 35 beneficiaries, against an average of 374 among the 112 providers of this specialty who prescribed in Part D.
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.
Bills Medicare through one group practice
- Regents OF The University OF CaliforniaSan Diego, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William E. Toppen among 11 undersea and hyperbaric medicine (emergency medicine) physician records in California
William E. Toppen, M.D. is one of 11 undersea and hyperbaric medicine (emergency medicine) physician records with a practice address in California. 64% 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 82% of them.
- NPI issued2016 · 82% of these records are older, 9% newer
- In a Medicare fileYes · 64% of these records are
- In the CMS Doctors and Clinicians fileYes · 55% of these records are
- Record last updated2025 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207PE0005X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Undersea and Hyperbaric Medicine (Emergency Medicine) Physician providers in California
There are 11 undersea and hyperbaric medicine (emergency medicine) physician records in California.
All 11 in California → Every provider in San Diego → Undersea and Hyperbaric Medicine (Emergency Medicine) Physician nationwide →
The 8 undersea and hyperbaric medicine (emergency medicine) physician records with the nearest ZIP codes
- Andrew Carpenter, MDSan Diego, CA 921031437998648
- Sandra Hayes, MDSan Diego, CA 921031740431444
- Kenneth Kelly, M.D.San Diego, CA 921551730224908
- Gary Willard, M.D.Carlsbad, CA 920081588780373
- John Gambol, M.D.Placentia, CA 928701255339826
- John Deacon, M.D.Santa Barbara, CA 931111477567923
- Samuel Miller, D.O.Santa Maria, CA 934541619066693
- Russell Gray, MDFairfield, CA 945351427341015
Common questions
What is William E. Toppen, M.D.'s NPI number?
William E. Toppen, M.D.'s National Provider Identifier (NPI) is 1215399407, issued on Mar 25, 2016. An NPI identifies a provider in billing; it is not a license.
Where is William E. Toppen, M.D. located?
The NPPES record lists a practice address at 200 W Arbor Dr, San Diego, CA, 92103. Phone: (800) 926-8273. Providers update this record themselves, so call before visiting.
How can I verify William E. Toppen, M.D.'s license?
NPPES lists California license number A155816, 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 E. Toppen, M.D. prescribe under Medicare Part D?
In 2024, William E. Toppen, M.D. had 94 Medicare Part D claims for 35 beneficiaries; the average among undersea and hyperbaric medicine (emergency medicine) physician prescribers was 374. 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.