Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark Muehleisen

Specialist in Highlands Ranch, CO · enumerated 2020.

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

National Provider Identifier

1235768672

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Registry record

Entity type Individual (Type 1)

Name Mark Muehleisen

Sex Male

Practice address 5690 County Line Pl, Highlands Ranch, CO, 80126

Phone (720) 300-3929

Enumeration date Apr 7, 2020

Last updated in NPPES Apr 7, 2020

Taxonomy & licenses

174400000X Specialist Other Service Providers 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 Muehleisen?

The National Provider Identifier (NPI) for Mark Muehleisen is 1235768672, a Type 1 (individual) record in the CMS NPPES registry.

Where does Mark Muehleisen practice?

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

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-04-07.