Mr. Mark C Johnsen, DDS
Mr. Mark C Johnsen is a Dentist provider (Dentist) practicing in Highland, CA, registered in the NPPES registry with NPI 1245390988 since 2006. The credential DDS stands for Doctor of Dental Surgery.
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1245390988 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Mr. Mark C Johnsen |
| Credential | DDS |
| Sex | Male |
| Practice address | 6982 BOULDER AVENUE, Highland, CA, 92346 |
| Phone | 9098622121 |
| Fax | 9098626648 |
| Enumeration date | 2006-12-11 |
| Last updated in NPPES | 2007-07-08 |
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 122300000X | Dentist | Primary | 40622 | CA |
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 Johnsen, DDS NPI: 1245390988 Taxonomy: 122300000X (Dentist) Address: 6982 BOULDER AVENUE, Highland, CA, 92346
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1326109000 | Karin Johnsen | Individual | Dentist | Highland, CA |
Verify this record
Cross-check NPI 1245390988 against the authoritative CMS record: view Mr. Mark C Johnsen 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 2007-07-08.