Dr. Gregory John Cusack, DC
Dr. Gregory John Cusack is a Chiropractor provider (Chiropractor) practicing in Walnut Creek, CA, registered in the NPPES registry with NPI 1841361797 since 2006. The credential DC stands for Doctor of Chiropractic. Practices at Cusack Chiropractic (listed at the same practice address in NPPES).
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1841361797 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Dr. Gregory John Cusack |
| Credential | DC |
| Sex | Male |
| Practice address | 2801 YGNACIO VALLEY RD, SUITE B, Walnut Creek, CA, 94598 |
| Phone | 9259450555 |
| Fax | 9259451873 |
| Enumeration date | 2006-11-13 |
| Last updated in NPPES | 2007-07-08 |
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 111N00000X | Chiropractor | Primary | DC12150 | CA |
DC — Doctor of Chiropractic: A licensed chiropractor focusing on musculoskeletal and nervous system disorders. About the DC credential
Copy-ready billing details
Provider: Gregory Cusack, DC NPI: 1841361797 Taxonomy: 111N00000X (Chiropractor) Address: 2801 YGNACIO VALLEY RD, SUITE B, Walnut Creek, CA, 94598
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1649251232 | Robert Cheung | Individual | Optometrist | Walnut Creek, CA |
| 1144391095 | Julie Souza | Individual | Chiropractor | Walnut Creek, CA |
| 1285842187 | David Burr | Individual | Dentist | Walnut Creek, CA |
| 1558598946 | Van Pham | Individual | Optometrist | Walnut Creek, CA |
| 1023369568 | Cusack Chiropractic | Organization | Chiropractor | Walnut Creek, CA |
| 1679920060 | Ashley Tjoe | Individual | Optometrist | Walnut Creek, CA |
Verify this record
Cross-check NPI 1841361797 against the authoritative CMS record: view Dr. Gregory John Cusack 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.
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Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2007-07-08.