Mark Janssen, MD
NPI 1407923345 · Anatomic Pathology & Clinical Pathology Physician · Anaheim, CA
Mark Janssen, MD is a Anatomic Pathology & Clinical Pathology Physician provider in Anaheim, CA (NPI 1407923345).
Provider details
- NPI number
- 1407923345
- Entity type
- Individual
- Primary specialty
- Anatomic Pathology & Clinical Pathology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A24214 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-29
- Last updated
- 2008-09-23
Frequently asked questions
- What is Mark Janssen's NPI number?
- Mark Janssen's National Provider Identifier (NPI) is 1407923345, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Janssen's specialty?
- Mark Janssen is listed in the NPPES registry with a primary specialty of Anatomic Pathology & Clinical Pathology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Janssen located?
- Mark Janssen's practice location on file with NPPES is 441 N Lakeview Ave, Anaheim, CA 92807-3028.
- What is Mark Janssen's phone number?
- The practice phone number listed in the NPPES registry for Mark Janssen is (888) 988-2800.
- Is Mark Janssen's NPI active?
- Yes — Mark Janssen's NPI (1407923345) is active in the NPPES registry as of the last update on 2008-09-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.