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Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Gerald B Lumer, M.D.

Internal Medicine Physician in Chicago, IL · enumerated 2012.

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

National Provider Identifier

1326311424

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Registry record

Entity type Individual (Type 1)
Name Dr. Gerald B Lumer
Credential M.D.
Sex Male
Practice address 332 S Michigan Ave, Suite 1300, Chicago, IL, 60604
Phone (312) 322-0271
Fax (312) 322-0218
Enumeration date Feb 20, 2012
Last updated in NPPES Feb 20, 2012

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License MD035944 (DC) Primary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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 Gerald Lumer's NPI record?
Cross-check NPI 1326311424 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1326311424 active?
Yes, as of the latest NPPES snapshot, NPI 1326311424 is active (record last updated 2012-02-20).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-02-20.