William Sohn, M.D.
Urology Physician · Fontana, CA
William Sohn, M.D. is a urology physician with a practice address in Fontana, California, and NPI 1467781583, issued on Dec 19, 2009. Check the license (California A106027, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William Sohn
- Credential
- M.D.
- Primary taxonomy
- Urology Physician 208800000X
- License numbers
- A106027 CA
49764 TN
Self-reported in NPPES; status is on the state search - Practice location
- 9961 Sierra Ave, Fontana, CA 92335
- Phone
- (909) 427-4081
- Enumerated
- Dec 19, 2009
- Record last updated
- Nov 17, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20120601000502); accepts Medicare assignment
- Medical or professional school
- New York Medical College, 2007
- Entity
- Type 1 · individual
8 nearest urology physician records → All 1,524 in California → Look up another NPI →
Also registered at 9961 Sierra Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify William Sohn in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A106027Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
55% fewer Medicare Part D claims than the average urology physician in 2024
606 Medicare Part D claims for 193 beneficiaries, against an average of 1,340 among the 10,782 providers of this specialty who prescribed in Part D. 19 claims were for opioids.
Most prescribed
- Finasteride234 claims
- Tamsulosin Hcl157 claims
- Solifenacin Succinate47 claims
- Ciprofloxacin Hcl33 claims
- Nitrofurantoin Mono-Macro18 claims
- Hydrocodone-Acetaminophen17 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: $186.12
2 payments; by number, the most common kind was food and beverage; the largest payer was Procept BioRobotics Corporation. The 9,340 providers of this specialty with any payment received $3,800.04 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
- Southern California Permanente Medical GroupOntario, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William Sohn among 1,524 urology physician records in California
William Sohn, M.D. is one of 1,524 urology physician records with a practice address in California. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 64% of them.
- NPI issued2009 · 64% of these records are older, 33% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2007 · median 2003 among the 1,049 with a school on file
- Record last updated2021 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208800000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Urology Physician providers in California
There are 1,524 urology physician records in California.
All 1,524 in California → Every provider in Fontana → Urology Physician nationwide →
The 8 urology physician records with the nearest ZIP codes
- Luther Bryant, MDFontana, CA 923351114094117
- Arsenio Figueroa, MDFontana, CA 923351225109275
- Stephanie Jensen, MDFontana, CA 923351992201297
- Manouchehr Lalehzarian, MDFontana, CA 923351255402228
- Michael Lawrence, MDFontana, CA 923351962561563
- Albert Mikhail, MDFontana, CA 923351912074758
- Kent Miyamoto, MDFontana, CA 923351952472912
- Casey Ng, M.D.Fontana, CA 923351093911349
Common questions
What is William Sohn, M.D.'s NPI number?
William Sohn, M.D.'s National Provider Identifier (NPI) is 1467781583, issued on Dec 19, 2009. An NPI identifies a provider in billing; it is not a license.
Where is William Sohn, M.D. located?
The NPPES record lists a practice address at 9961 Sierra Ave, Fontana, CA, 92335. Phone: (909) 427-4081. Providers update this record themselves, so call before visiting.
How can I verify William Sohn, M.D.'s license?
NPPES lists California license number A106027, 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 Sohn, M.D. prescribe under Medicare Part D?
In 2024, William Sohn, M.D. had 606 Medicare Part D claims for 193 beneficiaries; the average among urology physician prescribers was 1,340. 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.