Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark Steven Larsen

Q: What is the NPI number for Mark Larsen?

The National Provider Identifier (NPI) for Mark Larsen is 1447223078, a Type 1 (individual) record in the CMS NPPES registry.

Certified Registered Nurse Anesthetist in Norwich, CT · enumerated 2006.

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

National Provider Identifier

1447223078

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Registry record

Entity type Individual (Type 1)

Name Mark Steven Larsen

Sex Male

Practice address 326 Washington St, Norwich, CT, 06360

Phone (860) 823-6337

Enumeration date Feb 13, 2006

Last updated in NPPES Aug 2, 2012

Taxonomy & licenses

367500000X Certified Registered Nurse Anesthetist Physician Assistants & Advanced Practice Nursing Providers · License 001769 (CT) Primary

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

What is the NPI number for Mark Larsen?

The National Provider Identifier (NPI) for Mark Larsen is 1447223078, a Type 1 (individual) record in the CMS NPPES registry.

Where does Mark Larsen practice?

The practice location on file with NPPES is in Norwich, CT. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-08-02.