Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Mark A Janzen, M.D.

Diagnostic Radiology Physician in Tulsa, OK · enumerated 2005.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1699758961

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Mr. Mark A Janzen

Credential M.D.

Sex Male

Practice address 5801 E. 41st Street, Suite 900, Tulsa, OK, 74135

Phone (918) 934-8347

Fax (918) 743-8552

Enumeration date Nov 21, 2005

Last updated in NPPES Aug 25, 2025

Taxonomy & licenses

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License 18316 (OK) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
100224530A	Medicaid	OK	-
300033051	Other	OK	RAILROAD MEDICARE
243407701	Other	OK	MEDICARE
300129659	Other	OK	RAILROAD MEDICARE

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 → Validate an NPI →

Frequently asked questions

Is NPI 1699758961 active?

Yes, as of the latest NPPES snapshot, NPI 1699758961 is active (record last updated 2025-08-25).

How do I verify Mark Janzen's NPI record?

Cross-check NPI 1699758961 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-08-25.