Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Advanced Psychiatry Clinics, S.C.

Psychiatry Physician in Chicago, IL · enumerated 2020 · authorized official Marek Walczyk, President.

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

National Provider Identifier

1164047833

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Registry record

Entity type Organization (Type 2)

Legal business name Advanced Psychiatry Clinics, S.C.

Practice address 5519 N Cumberland Ave Ste 1016, Chicago, IL, 60656

Phone (708) 224-8840

Fax (773) 594-7721

Enumeration date Jun 9, 2020

Last updated in NPPES Jun 9, 2020

Taxonomy & classification

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians Primary

Authorized official

Name Marek Walczyk

Title President

Phone (708) 224-8840

Other identifiers

Identifier	Type	State	Issuer
36107779	Other	IL	MEDICAL 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

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2020-06-09. Verify at npiregistry.cms.hhs.gov.

Where is Advanced Psychiatry Clinics, S.C. located?

The practice location on file with NPPES is in Chicago, IL.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-06-09.