Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Darek Gregory Maciasz, R.PH

Pharmacist in Mt Prospect, IL · enumerated 2011.

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

National Provider Identifier

1891079463

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Mr. Darek Gregory Maciasz

Credential R.PH

Sex Male

Practice address 999 N Elmhurst Rd, Mt Prospect, IL, 60056

Phone (847) 660-2028

Fax (847) 660-2025

Enumeration date Sep 30, 2011

Last updated in NPPES Sep 30, 2011

Taxonomy & licenses

183500000X Pharmacist Pharmacy Service Providers · License 051288015 (IL) Primary

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

Is NPI 1891079463 active?

Yes, as of the latest NPPES snapshot, NPI 1891079463 is active (record last updated 2011-09-30).

How do I verify Darek Maciasz's NPI record?

Cross-check NPI 1891079463 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

Browse all →

James Waldman General Practice Dentistry · Mount Prospect, IL NPI 1174579312 Costco Wholesale Corporation Community/Retail Pharmacy · Mount Prospect, IL NPI 1952411563 Melanie Nichol Optometrist · Mount Prospect, IL NPI 1780775973 Harbans Mavi Internal Medicine Physician · Mt Prospect, IL NPI 1710052436 Sheilendr Khipple MD Specialist · Mt Prospect, IL NPI 1306900493 Lois Veneskey Pharmacist · Mt Prospect, IL NPI 1184990475 Barbara Osborn Pharmacist · Mount Prospect, IL NPI 1255685848 Costco Wholesale Corporation Eyewear Supplier · Mt Prospect, IL NPI 1952792608

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-09-30.