Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William James Monahan, FNP

Family Nurse Practitioner in Newtown Square, PA · enumerated 2006.

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

National Provider Identifier

1588631873

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Registry record

Entity type Individual (Type 1)

Name William James Monahan

Credential FNP

Sex Male

Practice address 113 Ridgefield Rd, Newtown Square, PA, 19073

Phone (610) 356-5988

Enumeration date Mar 5, 2006

Last updated in NPPES Dec 13, 2017

Taxonomy & licenses

363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License SP017755 (PA) Primary

163W00000X Registered Nurse Nursing Service Providers · License RN502050L (PA) Secondary

FNP · Family Nurse Practitioner: A nurse practitioner certified in family practice across the lifespan. About the FNP 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

Where does William Monahan practice?

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

What is the NPI number for William Monahan?

The National Provider Identifier (NPI) for William Monahan is 1588631873, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2017-12-13.