Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Harold A Kessler, M.D.

Infectious Disease Physician in Chicago, IL · enumerated 2006.

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

National Provider Identifier

1730140534

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Registry record

Entity type Individual (Type 1)

Name Dr. Harold A Kessler

Credential M.D.

Sex Male

Practice address 600 S Paulina St, Suite 143, Chicago, IL, 60612

Phone (312) 942-2061

Fax (312) 942-2184

Enumeration date Mar 31, 2006

Last updated in NPPES Sep 28, 2011

Taxonomy & licenses

207RI0200X Infectious Disease Physician Allopathic & Osteopathic Physicians · License 036051260 (IL) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
036051260	Medicaid	IL	-
440003642	Other	IL	RR MEDICARE

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 the NPI number for Harold Kessler?

The National Provider Identifier (NPI) for Harold Kessler is 1730140534, a Type 1 (individual) record in the CMS NPPES registry.

Where does Harold Kessler practice?

The practice location on file with NPPES is in Chicago, IL. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-09-28.