Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ralph Pierce Zehler III, PA-C

Physician Assistant in Mchenry, IL · enumerated 2006 · practices at Centegra Health System.

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

National Provider Identifier

1972562643

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Registry record

Entity type Individual (Type 1)

Name Ralph Pierce Zehler III

Credential PA-C

Sex Male

Practice address 4309 W Medical Center Dr Ste A200, Mchenry, IL, 60050

Phone (815) 759-8070

Fax (815) 759-4931

Enumeration date Mar 21, 2006

Last updated in NPPES Jan 30, 2023

Taxonomy & licenses

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 085006771 (IL) Primary

363AS0400X Surgical Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License PA10001576 (WA) Secondary

Other identifiers

Identifier	Type	State	Issuer
0196113	Other	WA	L&I AND CRIME VICTIMS
8422180	Medicaid	WA	-

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.

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Frequently asked questions

Is NPI 1972562643 active?

Yes, as of the latest NPPES snapshot, NPI 1972562643 is active (record last updated 2023-01-30).

How do I verify Ralph Zehler's NPI record?

Cross-check NPI 1972562643 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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Aqeel Sandhu Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · Mchenry, IL NPI 1922003193 Mubashir Ahmed Cardiovascular Disease Physician · Mchenry, IL NPI 1366466377 Asad Sheikh Interventional Cardiology Physician · Mchenry, IL NPI 1588759815 Linda Rood Family Nurse Practitioner · Mchenry, IL NPI 1629191275 Elizabeth Retzer Interventional Cardiology Physician · Mchenry, IL NPI 1639331655 Priya Sateesha Cardiovascular Disease Physician · Mchenry, IL NPI 1699939892 Mohammad Kizilbash Cardiovascular Disease Physician · Mchenry, IL NPI 1114162948 Vincent Woo Interventional Cardiology Physician · Mchenry, IL NPI 1407080575

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-01-30.