Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Mark Jacob Sorensen, M.D.

Pediatrics Physician in Kalispell, MT · enumerated 2006.

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

National Provider Identifier

1841219193

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Registry record

Entity type Individual (Type 1)

Name Dr. Mark Jacob Sorensen

Credential M.D.

Sex Male

Practice address Kalispell, MT, 59901

Phone (406) 752-2277

Fax (406) 752-5029

Enumeration date Jul 18, 2006

Last updated in NPPES Jul 8, 2007

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License 4265 (MT) 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
810375497 59901 A001	Other	MT	TRICARE
0050882	Medicaid	MT	-
12270	Other	MT	BLUE CROSS OF MONTANA

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.

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Frequently asked questions

Is NPI 1841219193 active?

Yes, as of the latest NPPES snapshot, NPI 1841219193 is active (record last updated 2007-07-08).

How do I verify Mark Sorensen's NPI record?

Cross-check NPI 1841219193 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.