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GROSSWEINER & BLASZAK, P.C.
NPI 1194789990
Dermatology in Naperville, IL

Active since April 17, 2006
1220 HOBSON RD STE 116, NAPERVILLE, IL 60540(630) 355-6660(630) 527-2856 Get Directions Write a Review

NPPES record last updated: July 18, 2022. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Jul 18, 2022, Jul 15, 2022, Aug 22, 2020 (3 updates tracked since 2020).

About Grossweiner & Blaszak, P.c. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

GROSSWEINER & BLASZAK, P.C. (NPI 1194789990) is a healthcare organization registered as a dermatology in Naperville, Illinois and active in the NPI registry since April 2006. The organization maintains a secondary practice location in Naperville and lists Laura Heimburger, Business Manager, as its authorized official.

NPPES Registry Identity

NPI1194789990
Entity TypeOrganization
Primary Taxonomy207N00000X
Legal Business NameGROSSWEINER & BLASZAK, P.C.
Location Address1220 HOBSON RD STE 116Naperville, IL 60540-8137
Mailing Address1220 Hobson Rd Ste 116Naperville, IL 60540-8137 · (630) 355-6660 · Fax (630) 527-2856
Phone(630) 355-6660
Fax(630) 527-2856
Organization SubpartNo
Authorized OfficialLaura HeimburgerBusiness Manager · (630) 355-6660
Enumeration DateApril 17, 2006
Last NPPES UpdateJuly 18, 20223 updates tracked since enumeration
NPPES CertifiedJuly 18, 2022
✔ NPI 1194789990 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyDermatologyAllopathic & Osteopathic Physicians
Taxonomy Code207N00000X
Definition
A dermatologist is trained to diagnose and treat pediatric and adult patients with benign and malignant disorders of the skin, mouth, external genitalia, hair and nails, as well as a number of sexually transmitted diseases. The dermatologist has had additional training and experience in the diagnosis and treatment of skin cancers, melanomas, moles and other tumors of the skin, the management of contact dermatitis and other allergic and nonallergic skin disorders, and in the recognition of the skin manifestations of systemic (including internal malignancy) and infectious diseases. Dermatologists have special training in dermatopathology and in the surgical techniques used in dermatology. They also have expertise in the management of cosmetic disorders of the skin such as hair loss and scars and the skin changes associated with aging.
1220 HOBSON RD STE 116, Naperville, IL 60540
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Secondary Practice Location 1

Location 11220 Hobson Rd Ste 116Naperville, IL 60540-8137 · Phone (630) 355-6660 · Fax (630) 527-2856

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Grossweiner & Blaszak, P.c. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

2

Medicare enrollment records show 2 clinicians reassign Medicare billing to Grossweiner & Blaszak, P.C., which bills Medicare for the services they deliver. Of these, 1 practice at this address. They are listed nearest first.

Clinicians, nearest first (2)

Wayne Blaszak, M.D.
Dermatology
NPI 1245294008
1220 HOBSON RD STE 116
Naperville, IL 60540
(630) 355-6660
✔ PECOS✔ Accepts MedicareSame address
Scott Blaszak
Dermatology
NPI 1265994925
5841 S MARYLAND AVE
Chicago, IL 60637
(773) 702-6559
✔ PECOS✔ Accepts Medicare26 mi

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Grossweiner & Blaszak, P.C.'s NPI number?

The NPI number for Grossweiner & Blaszak, P.C. is 1194789990. It was assigned to this organization in the NPPES registry on April 17, 2006.

Where is Grossweiner & Blaszak, P.C. located?

Grossweiner & Blaszak, P.C. is located at 1220 Hobson Rd Ste 116, Naperville, IL 60540. The listed phone number is (630) 355-6660.

What is Grossweiner & Blaszak, P.C.'s specialty?

The primary specialty registered for this NPI is Dermatology with taxonomy code 207N00000X.

Is Grossweiner & Blaszak, P.C. enrolled in Medicare?

Yes. Grossweiner & Blaszak, P.C. is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Grossweiner & Blaszak, P.C.?

According to the CMS Revalidation Reassignment List (October 2026 release), 2 clinicians, all in Dermatology, reassign their Medicare billing to Grossweiner & Blaszak, P.C.. A reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for the clinician's services. Of these, 1 practice at this address. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Grossweiner & Blaszak, P.C. was last updated on July 18, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.