What is Mark Natanek's NPI number?

Mark Natanek's National Provider Identifier (NPI) is 1285521393, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Mark Natanek's specialty?

Mark Natanek is listed in the NPPES registry with a primary specialty of Pharmacist (Pharmacy Service Providers).

Where is Mark Natanek located?

Mark Natanek's practice location on file with NPPES is 1520 W Harrison St Rm 4068, Chicago, IL 60607-3106.

What is Mark Natanek's phone number?

The practice phone number listed in the NPPES registry for Mark Natanek is (312) 942-9484.

Is Mark Natanek's NPI active?

Yes — Mark Natanek's NPI (1285521393) is active in the NPPES registry as of the last update on 2025-06-20.

IndividualActive

Mark Natanek, PHARMD.

NPI 1285521393 · Pharmacist · Chicago, IL

Mark Natanek, PHARMD. is a Pharmacist provider in Chicago, IL (NPI 1285521393).

Provider details

NPI number: 1285521393
Entity type: Individual
Primary specialty: PharmacistPharmacy Service Providers
Credential: PHARMD.
Sex: Male
Sole proprietor: Yes
License: 051.290579 (IL)

Specialties & taxonomies

PharmacistPrimary183500000XLicense 051.290579 (IL)
Pharmacy Service Providers

Profile Score

Established profile(54/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure38% of score
1 yr in NPPES registry
Profile completeness38% of score
100% of core fields populated
Practice footprint23% of score
1 documented practice location

Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.

Practice location

1520 W Harrison St Rm 4068

Chicago, IL 60607-3106

Phone: (312) 942-9484

Street-level locationGet directions

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Mailing address