Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. William Wan Kao, M.D.
Urology Physician in Largo, MD · enumerated 2008.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1821257924
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Registry record
Entity type Individual (Type 1)
Name Dr. William Wan Kao
Credential M.D.
Sex Male
Practice address 1221 Mercantile Ln, Largo, MD, 20774
Phone (301) 618-5633
Fax (301) 618-7205
Enumeration date Jun 3, 2008
Last updated in NPPES Jun 22, 2021
Taxonomy & licenses
208800000X Urology Physician Allopathic & Osteopathic Physicians · License 0101255682 (VA) Secondary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure.
About the MD credential
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.
Frequently asked questions
What is the NPI number for William Kao?
The National Provider Identifier (NPI) for William Kao is 1821257924, a Type 1 (individual) record in the CMS NPPES registry.
Where does William Kao practice?
The practice location on file with NPPES is in Largo, MD. Providers can have multiple locations; NPPES lists the primary practice address.
Other providers at this practice address
Browse all → Stephen Ilario Orthopaedic Surgery Physician · Largo, MD NPI 1164425419 Dwayne Thompson Emergency Medicine Physician · Largo, MD NPI 1386630614 Elizabeth Biru Internal Medicine Physician · Largo, MD NPI 1457342230 Felicia Elvis Physician Assistant · Largo, MD NPI 1033100391 Weijia Xia Yan Anesthesiology Physician · Upper Marlboro, MD NPI 1114901477 Michelle Mead Emergency Medicine Physician · Upper Marlboro, MD NPI 1689650780 Madhu Priya Khanna Urology Physician · Largo, MD NPI 1154309813 Kristina Eley Medical Physician Assistant · Largo, MD NPI 1306804927
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-06-22.