Dr. William Derry Heasley, PSY.D.
Dr. William Derry Heasley is a Clinical Psychologist provider (Psychologist) practicing in Gloucester, MA, registered in the NPPES registry with NPI 1588728513 since 2006. The credential PSYD stands for Doctor of Psychology. Practices at Seaside Counseling, LLC (listed at the same practice address in NPPES).
✓ Active NPI ✓ Valid NPI checksum Sole proprietor
| NPI | 1588728513 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Dr. William Derry Heasley |
| Credential | PSY.D. |
| Sex | Male |
| Practice address | Gloucester, MA, 01930 |
| Phone | 9782828281 |
| Fax | 9782821143 |
| Enumeration date | 2006-12-21 |
| Last updated in NPPES | 2013-06-20 |
Street address withheld — NPPES sole-proprietor addresses can be home addresses. See our data policy.
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 103TC0700X | Clinical Psychologist | Primary | 7033 | MA |
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 |
Copy-ready billing details
Provider: William Heasley, PSY.D. NPI: 1588728513 Taxonomy: 103TC0700X (Clinical Psychologist) Address: Gloucester, MA, 01930
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1053303081 | Jane Erb | Individual | Psychiatry Physician | Gloucester, MA |
| 1376531525 | Mary Alice Pardee | Individual | Clinical Social Worker | Gloucester, MA |
| 1740347657 | Sara Stotzer | Individual | Clinical Social Worker | Gloucester, MA |
| 1073841995 | Seaside Counseling, LLC | Organization | Clinical Social Worker | Gloucester, MA |
Verify this record
Cross-check NPI 1588728513 against the authoritative CMS record: view Dr. William Derry Heasley on the official NPPES registry .
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 or validate an NPI number.
Frequently asked questions
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Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2013-06-20.