Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Diane C Nielsen, M.D.
Pediatrics Physician in Geneva, IL · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1134126949
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Registry record
Entity type Individual (Type 1)
Name Diane C Nielsen
Credential M.D.
Sex Female
Practice address 2800 Keslinger Rd Ste 160, Geneva, IL, 60134
Phone (630) 232-7200
Fax (630) 232-2288
Enumeration date Jul 7, 2005
Last updated in NPPES May 20, 2020
Taxonomy & licenses
208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License 036084404 (IL) 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.
Frequently asked questions
Is NPI 1134126949 active?
Yes, as of the latest NPPES snapshot, NPI 1134126949 is active (record last updated 2020-05-20).
How do I verify Diane Nielsen's NPI record?
Cross-check NPI 1134126949 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-05-20.