Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William H Spear, M.D.

Clinical Cardiac Electrophysiology Physician in Evergreen Park, IL · enumerated 2006.

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

National Provider Identifier

1811085889

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Dr. William H Spear

Credential M.D.

Sex Male

Practice address 3545 W 95th St, Evergreen Park, IL, 60805

Phone (708) 346-5562

Enumeration date Oct 11, 2006

Last updated in NPPES Dec 20, 2021

Taxonomy & licenses

207RC0000X Cardiovascular Disease Physician Allopathic & Osteopathic Physicians · License 036-110866 (IL) Secondary

207RC0001X Clinical Cardiac Electrophysiology Physician Allopathic & Osteopathic Physicians · License 01065128A (IN) Secondary

207RC0001X Clinical Cardiac Electrophysiology Physician Allopathic & Osteopathic Physicians · License 036110866 (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
36110866	Medicaid	IL	-
01065128A	Other	IN	LICENSE NUMBER
256640002	Medicaid	IN	-
036-110866	Other	IL	LICENSE NUMBER
R02188	Other	IL	MEDICARE PTAN#
P00713306/CK6882	Other	IL	MEDICARE RAIL ROAD
201027840	Other	IN	MEDICARE IN

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 1811085889 active?

Yes, as of the latest NPPES snapshot, NPI 1811085889 is active (record last updated 2021-12-20).

How do I verify William Spear's NPI record?

Cross-check NPI 1811085889 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 2021-12-20.