Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. William Arthur Monaco, O.D., PH.D.
Optometrist in Newark, DE · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1427091057
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Registry record
Entity type Individual (Type 1)
Name Dr. William Arthur Monaco
Credential O.D., PH.D.
Sex Male
Practice address 23 Lynam Lookout Dr, Newark, DE, 19702
Phone (302) 598-3698
Fax (302) 292-2209
Enumeration date Jun 13, 2006
Last updated in NPPES Oct 20, 2011
Taxonomy & licenses
OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses.
About the OD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| P00029433 | Other | DE | RAILROAD MEDICARE |
| 1000023163 | Medicaid | DE | - |
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 Monaco practice?
The practice location on file with NPPES is in Newark, DE. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for William Monaco?
The National Provider Identifier (NPI) for William Monaco is 1427091057, a Type 1 (individual) record in the CMS NPPES registry.
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-10-20.