William R Alex, MD
William R Alex is a Surgery Physician provider (Surgery) practicing in Riverside, CA, registered in the NPPES registry with NPI 1558300681 since 2006. The credential MD stands for Doctor of Medicine.
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1558300681 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | William R Alex |
| Credential | MD |
| Sex | Male |
| Practice address | 4000 14TH ST, STE 306, Riverside, CA, 92501 |
| Phone | 9516822036 |
| Fax | 9516822942 |
| Enumeration date | 2006-06-05 |
| Last updated in NPPES | 2010-03-19 |
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 208600000X | Surgery Physician | Primary | G86010 | CA |
| 2086S0102X | Surgical Critical Care Physician | Secondary | G86010 | CA |
| 2086S0127X | Trauma Surgery Physician | Secondary | G86010 | CA |
| 208G00000X | Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician | Secondary | G86010 | CA |
MD — Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 00G860100 | Medicaid | CA | — |
Copy-ready billing details
Provider: William Alex, MD NPI: 1558300681 Taxonomy: 208600000X (Surgery Physician) Address: 4000 14TH ST, STE 306, Riverside, CA, 92501
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1184620411 | James Bartley | Individual | Clinical Genetics (M.D.) Physician | Riverside, CA |
| 1154327773 | Ashley Medical Group, Inc | Organization | Internal Medicine Physician | Riverside, CA |
| 1316948110 | Norman Snyder | Individual | Diagnostic Radiology Physician | Riverside, CA |
| 1104818459 | Riverside Imaging LLC | Organization | Radiology Clinic/Center | Riverside, CA |
| 1164410494 | Southern California Transplantation Institute | Organization | Specialist | Riverside, CA |
| 1326014986 | Trinh Tang | Individual | Internal Medicine Physician | Riverside, CA |
| 1386687754 | Donald Blackman | Individual | Internal Medicine Physician | Riverside, CA |
| 1184735953 | William R Alex MD Inc | Organization | Surgery Physician | Riverside, CA |
Verify this record
Cross-check NPI 1558300681 against the authoritative CMS record: view William R Alex on the official NPPES registry .
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes — even if the provider moves or changes specialty. Read the full guide or validate an NPI number.
Frequently asked questions
Where does William Alex practice?
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Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2010-03-19.