Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Dr Mark Trelka Ltd

Q: What type of organization is Dr Mark Trelka Ltd?

Dr Mark Trelka Ltd is registered in NPPES as a Neurology Physician (its primary provider taxonomy).

Neurology Physician in Vernon Hills, IL · enumerated 2006 · authorized official Mark Trelka, Physician.

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

National Provider Identifier

1649347808

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Registry record

Entity type Organization (Type 2)

Legal business name Dr Mark Trelka Ltd

Practice address 565 Lakeview Pkwy, Suite 104, Vernon Hills, IL, 60061

Phone (847) 549-0232

Fax (847) 549-9329

Enumeration date Nov 30, 2006

Last updated in NPPES Jan 9, 2012

Taxonomy & classification

2084N0400X Neurology Physician Allopathic & Osteopathic Physicians · License 036082394 (IL) Primary

Authorized official

Name Mark Trelka

Title Physician

Phone (847) 549-0232

Other identifiers

Identifier	Type	State	Issuer
036082394	Medicaid	IL	-
03905078	Other	IL	BCBS

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

What is a Type 2 NPI?

A Type 2 NPI identifies an organization (group practice, hospital, pharmacy, lab), while Type 1 NPIs identify individual providers. Organizations bill under their Type 2 NPI.

What type of organization is Dr Mark Trelka Ltd?

Dr Mark Trelka Ltd is registered in NPPES as a Neurology Physician (its primary provider taxonomy).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-01-09.