Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. William L Kranzer, OD
Optometrist in Largo, MD · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1013089507
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Registry record
Entity type Individual (Type 1)
Name Dr. William L Kranzer
Credential OD
Sex Male
Practice address 1221 Mercantile Lane, Largo, MD, 20774
Phone (301) 618-5578
Fax (301) 618-5673
Enumeration date Nov 14, 2006
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses.
About the OD 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
Where does William Kranzer practice?
The practice location on file with NPPES is in Largo, MD. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for William Kranzer?
The National Provider Identifier (NPI) for William Kranzer is 1013089507, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.