Dr. Mark L Duell Sr., DC
Dr. Mark L Duell Sr. is a Chiropractor provider (Chiropractor) practicing in Santa Barbara, CA, registered in the NPPES registry with NPI 1841282431 since 2005. The credential DC stands for Doctor of Chiropractic. Practices at Hope Counseling Center (listed at the same practice address in NPPES).
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1841282431 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Dr. Mark L Duell Sr. |
| Credential | DC |
| Sex | Male |
| Practice address | 5350 HOLLISTER AVE, Santa Barbara, CA, 93111 |
| Phone | 8059673409 |
| Fax | 8059673401 |
| Enumeration date | 2005-08-18 |
| Last updated in NPPES | 2007-07-08 |
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 111N00000X | Chiropractor | Primary | 16347 | CA |
DC — Doctor of Chiropractic: A licensed chiropractor focusing on musculoskeletal and nervous system disorders. About the DC credential
Copy-ready billing details
Provider: Mark Duell, DC NPI: 1841282431 Taxonomy: 111N00000X (Chiropractor) Address: 5350 HOLLISTER AVE, Santa Barbara, CA, 93111
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1891787164 | Michael Hergenroether | Individual | Chiropractor | Santa Barbara, CA |
| 1710997325 | Michael York | Individual | Chiropractor | Santa Barbara, CA |
| 1760584700 | Hope Counseling Center | Organization | Marriage & Family Therapist | Santa Barbara, CA |
| 1598858201 | James Cochran | Individual | Chiropractor | Santa Barbara, CA |
| 1114170669 | Brian Martin | Individual | General Practice Dentistry | Santa Barbara, CA |
Verify this record
Cross-check NPI 1841282431 against the authoritative CMS record: view Dr. Mark L Duell Sr. 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.