Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Joelle Mast, PHD, MD

Q: What is the NPI number for Joelle Mast?

The National Provider Identifier (NPI) for Joelle Mast is 1285856054, a Type 1 (individual) record in the CMS NPPES registry.

Neurology with Special Qualifications in Child Neurology Physician in Sleepy Hollow, NY · enumerated 2007.

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

National Provider Identifier

1285856054

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Registry record

Entity type Individual (Type 1)

Name Dr. Joelle Mast

Credential PHD, MD

Sex Female

Practice address Sleepy Hollow, NY, 10591

Phone (914) 358-0188

Fax (914) 358-0189

Enumeration date May 2, 2007

Last updated in NPPES Sep 1, 2015

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License 157890 (NY) Secondary

2080H0002X Pediatric Hospice and Palliative Medicine Physician Allopathic & Osteopathic Physicians · License 157890 (NY) Secondary

2084N0402X Neurology with Special Qualifications in Child Neurology Physician Allopathic & Osteopathic Physicians · License 157890 (NY) Primary

PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers. About the PHD 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.

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Frequently asked questions

What is the NPI number for Joelle Mast?

The National Provider Identifier (NPI) for Joelle Mast is 1285856054, a Type 1 (individual) record in the CMS NPPES registry.

Where does Joelle Mast practice?

The practice location on file with NPPES is in Sleepy Hollow, NY. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-09-01.