Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Donald S Marek, R.PH.

Geriatric Pharmacist in Stone Lake, WI · enumerated 2007 · practices at Marek Ds Associates Ltd.

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

National Provider Identifier

1285844829

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Registry record

Entity type Individual (Type 1)

Name Mr. Donald S Marek

Credential R.PH.

Sex Male

Practice address W1859 County Highway B, Stone Lake, WI, 54876

Phone (715) 865-4910

Enumeration date May 23, 2007

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

1835G0303X Geriatric Pharmacist Pharmacy Service Providers · License 8505-040 (WI) Primary

RPH · Registered Pharmacist: A licensed pharmacist registered with a state board of pharmacy. About the RPH credential

Other identifiers

Identifier	Type	State	Issuer
8505-040	Other	WI	PHARMACIST LICENSE NUMBER

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 1285844829 active?

Yes, as of the latest NPPES snapshot, NPI 1285844829 is active (record last updated 2007-07-08).

How do I verify Donald Marek's NPI record?

Cross-check NPI 1285844829 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

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Marek Ds Associates Ltd Geriatric Pharmacist · Stone Lake, WI NPI 1841400363

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