Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Jon P Gieser, M.D.

Q: What is the NPI number for Jon Gieser?

The National Provider Identifier (NPI) for Jon Gieser is 1235127168, a Type 1 (individual) record in the CMS NPPES registry.

Retina Specialist (Ophthalmology) Physician in Wheaton, IL · enumerated 2005.

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

National Provider Identifier

1235127168

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Registry record

Entity type Individual (Type 1)

Name Dr. Jon P Gieser

Credential M.D.

Sex Male

Practice address 2015 N Main St, Wheaton, IL, 60187

Phone (630) 668-8250

Fax (630) 668-8916

Enumeration date Oct 13, 2005

Last updated in NPPES Aug 21, 2024

Taxonomy & licenses

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License 036-086450 (IL) Secondary

207WX0107X Retina Specialist (Ophthalmology) Physician Allopathic & Osteopathic Physicians · License 036-086450 (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
036086450	Medicaid	IL	-
180027390	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 Jon Gieser?

The National Provider Identifier (NPI) for Jon Gieser is 1235127168, a Type 1 (individual) record in the CMS NPPES registry.

Where does Jon Gieser practice?

The practice location on file with NPPES is in Wheaton, 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 2024-08-21.