Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Joseph Louis Castelli Jr., D.O.

Obstetrics & Gynecology Physician in King of Prussia, PA · enumerated 2005.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1811991276

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Registry record

Entity type Individual (Type 1)

Name Dr. Joseph Louis Castelli Jr.

Credential D.O.

Sex Male

Practice address 583 Shoemaker Rd, Ste 104, King of Prussia, PA, 19406

Phone (610) 265-0184

Fax (610) 265-4088

Enumeration date Jun 13, 2005

Last updated in NPPES Jun 30, 2021

Taxonomy & licenses

207V00000X Obstetrics & Gynecology Physician Allopathic & Osteopathic Physicians · License OS006403E (PA) Primary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO 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.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Joseph Castelli?

The National Provider Identifier (NPI) for Joseph Castelli is 1811991276, a Type 1 (individual) record in the CMS NPPES registry.

Where does Joseph Castelli practice?

The practice location on file with NPPES is in King of Prussia, PA. Providers can have multiple locations; NPPES lists the primary practice address.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-06-30.