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

Dr. William Derry Heasley, PSY.D.

Clinical Psychologist in Gloucester, MA · enumerated 2006 · practices at Seaside Counseling, LLC.

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

National Provider Identifier

1588728513

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Registry record

Entity type Individual (Type 1)

Name Dr. William Derry Heasley

Credential PSY.D.

Sex Male

Practice address Gloucester, MA, 01930

Phone (978) 282-8281

Fax (978) 282-1143

Enumeration date Dec 21, 2006

Last updated in NPPES Jun 20, 2013

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

Taxonomy & licenses

103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers · License 7033 (MA) Primary

PSYD · Doctor of Psychology: A clinical doctorate in psychology focused on professional practice. About the PSYD credential

Other identifiers

Identifier	Type	State	Issuer
W05600	Other	MA	CLINICAL PSYCHOLOGIST

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 Heasley practice?

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

What is the NPI number for William Heasley?

The National Provider Identifier (NPI) for William Heasley is 1588728513, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

Browse all →

Jane Erb Psychiatry Physician · Gloucester, MA NPI 1053303081 Mary Alice Pardee Clinical Social Worker · Gloucester, MA NPI 1376531525 Sara Stotzer Clinical Social Worker · Gloucester, MA NPI 1740347657 Seaside Counseling, LLC Clinical Social Worker · Gloucester, MA NPI 1073841995

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-06-20.