Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
William Castilla, MD
Pediatrics Physician in Passaic, NJ · enumerated 2007.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1235283938
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Registry record
Entity type Individual (Type 1)
Name William Castilla
Credential MD
Sex Male
Practice address 293 Passaic Street, Passaic, NJ, 07055
Phone (973) 365-1377
Fax (973) 365-1229
Enumeration date Jan 22, 2007
Last updated in NPPES Jan 19, 2011
Taxonomy & licenses
208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License 25MA02465100 (NJ) Primary
208600000X Surgery Physician Allopathic & Osteopathic Physicians · License 25MA02465100 (NJ) Secondary
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 |
|---|---|---|---|
| 477050101 | Medicaid | NJ | - |
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 specialty is William Castilla?
William Castilla is registered in NPPES with the primary taxonomy of Pediatrics Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-01-19.