Dr. Mark Edward Greg, PHARMD, RPH
Dr. Mark Edward Greg is a Pharmacist provider (Pharmacist) practicing in Darien, IL, registered in the NPPES registry with NPI 1285976472 since 2013. The credential PHARMD stands for Doctor of Pharmacy.
✓ Active NPI ✓ Valid NPI checksum Sole proprietor
| NPI | 1285976472 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Dr. Mark Edward Greg |
| Credential | PHARMD, RPH |
| Sex | Male |
| Practice address | Darien, IL, 60561 |
| Phone | 6302046894 |
| Fax | 6309905499 |
| Enumeration date | 2013-03-26 |
| Last updated in NPPES | 2013-03-26 |
Street address withheld — NPPES sole-proprietor addresses can be home addresses. See our data policy.
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 183500000X | Pharmacist | Primary | 051037071 | IL |
PHARMD — Doctor of Pharmacy: A licensed pharmacist with a professional doctorate in pharmacy. About the PHARMD credential
Copy-ready billing details
Provider: Mark Greg, PHARMD, RPH NPI: 1285976472 Taxonomy: 183500000X (Pharmacist) Address: Darien, IL, 60561
Verify this record
Cross-check NPI 1285976472 against the authoritative CMS record: view Dr. Mark Edward Greg on the official NPPES registry .
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 or validate an NPI number.
Frequently asked questions
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Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2013-03-26.