Stephen V Sum Jr., D.C.
Stephen V Sum Jr. is a Chiropractor provider (Chiropractor) practicing in Castro Valley, CA, registered in the NPPES registry with NPI 1912055195 since 2007. The credential DC stands for Doctor of Chiropractic.
✓ Active NPI ✓ Valid NPI checksum Sole proprietor
| NPI | 1912055195 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Stephen V Sum Jr. |
| Credential | D.C. |
| Sex | Male |
| Practice address | Castro Valley, CA, 94546 |
| Phone | 5105381111 |
| Fax | 5105381040 |
| Enumeration date | 2007-01-06 |
| Last updated in NPPES | 2015-10-23 |
Street address withheld — NPPES sole-proprietor addresses can be home addresses. See our data policy.
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 111N00000X | Chiropractor | Primary | 18971 | CA |
DC — Doctor of Chiropractic: A licensed chiropractor focusing on musculoskeletal and nervous system disorders. About the DC credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| DC0189710 | Other | CA | PTAN |
| DC18971 | Other | CA | CHIROPRACTIC LICENSE |
| DC0189710 | Other | CA | BLUE SHIELD |
Copy-ready billing details
Provider: Stephen Sum, D.C. NPI: 1912055195 Taxonomy: 111N00000X (Chiropractor) Address: Castro Valley, CA, 94546
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1851302509 | John Guilford | Individual | Chiropractor | Castro Valley, CA |
| 1346305729 | Kiran Khemani | Individual | Dentist | Castro Valley, CA |
| 1396879565 | Stephen La Due | Individual | Dentist | Castro Valley, CA |
| 1801154166 | Alan Fierro | Individual | Public Health Dentistry | Castro Valley, CA |
| 1659119956 | Cassie Stansberry | Individual | Chiropractor | Castro Valley, CA |
Verify this record
Cross-check NPI 1912055195 against the authoritative CMS record: view Stephen V Sum Jr. 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 2015-10-23.