Dr. Mark Laverne Janzen, MD
Dr. Mark Laverne Janzen is a Vascular Surgery Physician provider (Surgery) practicing in Riverside, CA, registered in the NPPES registry with NPI 1932329265 since 2007. The credential MD stands for Doctor of Medicine.
✓ Active NPI ✓ Valid NPI checksum Sole proprietor
| NPI | 1932329265 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Dr. Mark Laverne Janzen |
| Credential | MD |
| Sex | Male |
| Practice address | Riverside, CA, 92505 |
| Phone | 4407810931 |
| Enumeration date | 2007-04-27 |
| Last updated in NPPES | 2017-01-27 |
Street address withheld — NPPES sole-proprietor addresses can be home addresses. See our data policy.
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 208600000X | Surgery Physician | Secondary | 089484 | OH |
| 2086S0127X | Trauma Surgery Physician | Secondary | 089484 | OH |
| 2086S0129X | Vascular Surgery Physician | Primary | A90203 | CA |
MD — Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential
Copy-ready billing details
Provider: Mark Janzen, MD NPI: 1932329265 Taxonomy: 2086S0129X (Vascular Surgery Physician) Address: Riverside, CA, 92505
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1487741278 | Dale Timothy | Individual | Pharmacist | Riverside, CA |
| 1649369794 | Jean Rich | Individual | Pharmacist | Riverside, CA |
| 1558540773 | Felicia Schwab-Doyle | Individual | Dermatology Physician | Riverside, CA |
| 1215216528 | Serjik Abrahamian | Individual | Family Medicine Physician | Riverside, CA |
| 1003160649 | Elaf Farahat | Individual | Registered Dietitian | Riverside, CA |
Verify this record
Cross-check NPI 1932329265 against the authoritative CMS record: view Dr. Mark Laverne Janzen 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
Is NPI 1932329265 active?
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Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2017-01-27.