Linda Trees Mack, PHD
Linda Trees Mack is a Clinical Psychologist provider (Psychologist) practicing in Ithaca, NY, registered in the NPPES registry with NPI 1720139637 since 2007. The credential PHD stands for Doctor of Philosophy. Practices at Kathleen Lilley (listed at the same practice address in NPPES).
✓ Active NPI ✓ Valid NPI checksum Sole proprietor
| NPI | 1720139637 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Linda Trees Mack |
| Credential | PHD |
| Sex | Female |
| Practice address | Ithaca, NY, 14850 |
| Phone | 6072774226 |
| Enumeration date | 2007-01-16 |
| Last updated in NPPES | 2007-07-08 |
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 | 004894 | NY |
PHD — Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers. About the PHD credential
Copy-ready billing details
Provider: Linda Mack, PHD NPI: 1720139637 Taxonomy: 103TC0700X (Clinical Psychologist) Address: Ithaca, NY, 14850
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1720112147 | Joan Lovejoy | Individual | Mental Health Counselor | Ithaca, NY |
| 1508026071 | Margaret Dieter | Individual | Clinical Social Worker | Ithaca, NY |
| 1376861633 | Linda Hopkins | Individual | Clinical Social Worker | Ithaca, NY |
| 1306229091 | Kathleen Lilley | Organization | Exclusive Provider Organization | Ithaca, NY |
| 1841657194 | Barbara Jastran | Individual | Clinical Social Worker | Ithaca, NY |
| 1245716562 | Amanda Walts | Individual | Clinical Social Worker | Ithaca, NY |
| 1629652060 | Anna Tamis | Individual | Clinical Child & Adolescent Psychologist | Ithaca, NY |
Verify this record
Cross-check NPI 1720139637 against the authoritative CMS record: view Linda Trees Mack 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 2007-07-08.