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Dr. William Stephen Lefler Jr., MD

Nephrology Physician in Twin Falls, ID · enumerated 2007.

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

National Provider Identifier

1023235058

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Registry record

Entity type Individual (Type 1)
Name Dr. William Stephen Lefler Jr.
Credential MD
Sex Male
Practice address 746 N College Rd Ste A, Twin Falls, ID, 83301
Phone (208) 814-7230
Enumeration date Apr 19, 2007
Last updated in NPPES Dec 1, 2022

Taxonomy & licenses

207RN0300X Nephrology Physician Allopathic & Osteopathic Physicians · License 19535 (NV) Secondary
207RN0300X Nephrology Physician Allopathic & Osteopathic Physicians · License MC-1695 (ID) 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
1023235058 Medicaid NV -

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

How do I verify William Lefler's NPI record?
Cross-check NPI 1023235058 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1023235058 active?
Yes, as of the latest NPPES snapshot, NPI 1023235058 is active (record last updated 2022-12-01).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-12-01.