Dr. Mitchell S Sill, D.C.
Dr. Mitchell S Sill is a Chiropractor provider (Chiropractor) practicing in Castro Valley, CA, registered in the NPPES registry with NPI 1144499559 since 2008. The credential DC stands for Doctor of Chiropractic.
✓ Active NPI ✓ Valid NPI checksum Sole proprietor
| NPI | 1144499559 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Dr. Mitchell S Sill |
| Credential | D.C. |
| Sex | Male |
| Practice address | Castro Valley, CA, 94546 |
| Phone | 5108861788 |
| Fax | 5108861725 |
| Enumeration date | 2008-02-29 |
| Last updated in NPPES | 2008-02-29 |
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 | DC14499 | CA |
DC — Doctor of Chiropractic: A licensed chiropractor focusing on musculoskeletal and nervous system disorders. About the DC credential
Copy-ready billing details
Provider: Mitchell Sill, D.C. NPI: 1144499559 Taxonomy: 111N00000X (Chiropractor) Address: Castro Valley, CA, 94546
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1720075914 | Judy Nogales-Chapman | Individual | Medical Physician Assistant | Castro Valley, CA |
| 1679657779 | John E Turns MD Inc | Organization | Family Medicine Physician | Castro Valley, CA |
| 1942371588 | John Turns | Individual | Family Medicine Physician | Castro Valley, CA |
| 1972637452 | Pt Works | Organization | Physical Therapist | Castro Valley, CA |
| 1063739340 | Michael S Mancina MD and Asssociates of California | Organization | Specialist | Castro Valley, CA |
| 1629503503 | Progressive Home Health and Hospice Care- Hayward, LLC | Organization | Community Based Hospice Care Agency | Castro Valley, CA |
| 1134655723 | Progressive Home Health and Hospice Care- Hayward, LLC | Organization | Home Health Agency | Castro Valley, CA |
Verify this record
Cross-check NPI 1144499559 against the authoritative CMS record: view Dr. Mitchell S Sill 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 2008-02-29.