Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Daryl Len Oconnor, MD

Orthopaedic Surgery Physician in Elmhurst, IL · enumerated 2005.

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

National Provider Identifier

1154323541

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Registry record

Entity type Individual (Type 1)

Name Daryl Len Oconnor

Credential MD

Sex Male

Practice address 360 W Butterfield Rd, Suite 160, Elmhurst, IL, 60126

Phone (630) 782-9600

Fax (630) 782-1643

Enumeration date Aug 15, 2005

Last updated in NPPES Feb 10, 2010

Taxonomy & licenses

207X00000X Orthopaedic Surgery Physician Allopathic & Osteopathic Physicians · License 036-106488 (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
02222323	Other	IL	BCBS
036106488	Medicaid	IL	-
P00055308	Other	IL	MEDICARE RAILROAD

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

Is NPI 1154323541 active?

Yes, as of the latest NPPES snapshot, NPI 1154323541 is active (record last updated 2010-02-10).

How do I verify Daryl Oconnor's NPI record?

Cross-check NPI 1154323541 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-02-10.