Mr. Mark S Castor, DDS
Mr. Mark S Castor is a General Practice Dentistry provider (Dentist) practicing in Austin, TX, registered in the NPPES registry with NPI 1578659488 since 2006. The credential DDS stands for Doctor of Dental Surgery.
✓ Active NPI ✓ Valid NPI checksum Sole proprietor
| NPI | 1578659488 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Mr. Mark S Castor |
| Credential | DDS |
| Sex | Male |
| Practice address | Austin, TX, 78704 |
| Phone | 5124417777 |
| Fax | 5124417632 |
| Enumeration date | 2006-10-05 |
| Last updated in NPPES | 2019-05-21 |
Street address withheld — NPPES sole-proprietor addresses can be home addresses. See our data policy.
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 1223G0001X | General Practice Dentistry | Primary | 12806 | TX |
DDS — Doctor of Dental Surgery: A licensed dentist; DDS and DMD are equivalent dental degrees. About the DDS credential
Copy-ready billing details
Provider: Mark Castor, DDS NPI: 1578659488 Taxonomy: 1223G0001X (General Practice Dentistry) Address: Austin, TX, 78704
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1669447397 | Ashwin Gowda | Individual | Sleep Medicine (Psychiatry & Neurology) Physician | Austin, TX |
| 1053352781 | Bibby Mathew | Individual | General Practice Dentistry | Austin, TX |
| 1144255704 | Josef E. Holme, MD, PA | Organization | Family Medicine Physician | Austin, TX |
| 1184706210 | Reta Elrod | Individual | Counselor | Austin, TX |
| 1114098225 | Margaret Rayne | Individual | General Practice Dentistry | Austin, TX |
| 1083788855 | Nancy Turner | Individual | Gynecology Physician | Austin, TX |
| 1396819173 | Lois Bachus | Individual | Gynecology Physician | Austin, TX |
| 1720154792 | Karn Kritsanachaiwanich | Individual | General Practice Dentistry | Austin, TX |
Verify this record
Cross-check NPI 1578659488 against the authoritative CMS record: view Mr. Mark S Castor 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 2019-05-21.