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

Mr. Mark Knowlton, PHARM.D.

Pharmacist in Jenison, MI · enumerated 2011.

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

National Provider Identifier

1942594270

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Registry record

Entity type Individual (Type 1)

Name Mr. Mark Knowlton

Credential PHARM.D.

Sex Male

Practice address Jenison, MI, 49428

Phone (616) 457-2730

Fax (616) 457-2730

Enumeration date Jun 3, 2011

Last updated in NPPES Jun 3, 2011

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

Taxonomy & licenses

183500000X Pharmacist Pharmacy Service Providers · License 5302034016 (MI) Primary

PHARMD · Doctor of Pharmacy: A licensed pharmacist with a professional doctorate in pharmacy. About the PHARMD credential

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 Knowlton?

The National Provider Identifier (NPI) for Mark Knowlton is 1942594270, a Type 1 (individual) record in the CMS NPPES registry.

Where does Mark Knowlton practice?

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

Other providers at this practice address

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Kathleen Mcmillan Pharmacist · Jenison, MI NPI 1902190283

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-06-03.