Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Robert J S Mack, M.D. P C

Ophthalmology Physician in Hoffman Estates, IL · enumerated 2005.

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

National Provider Identifier

1932107778

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Registry record

Entity type Individual (Type 1)

Name Dr. Robert J S Mack

Credential M.D. P C

Sex Male

Practice address 1220 W Higgins Rd, Ste 102, Hoffman Estates, IL, 60169

Phone (847) 755-9393

Fax (847) 755-1560

Enumeration date Jul 13, 2005

Last updated in NPPES Dec 28, 2022

Taxonomy & licenses

174400000X Specialist Other Service Providers · License 036-090403 (IL) Secondary

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License 036090403 (IL) Primary

Other identifiers

Identifier	Type	State	Issuer
6046380001	Other	IL	NATIONAL GOVERNMENT SERVICES

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.

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Frequently asked questions

How do I verify Robert Mack's NPI record?

Cross-check NPI 1932107778 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1932107778 active?

Yes, as of the latest NPPES snapshot, NPI 1932107778 is active (record last updated 2022-12-28).

Other providers at this practice address

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Robert J S Mack, MD PC Ophthalmology Physician · Hoffman Est, IL NPI 1255451563 Ophthalmic Consultants of Chicago, LLC Ophthalmology Physician · Hoffman Estates, IL NPI 1720365661

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-12-28.