Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Michael Xiaozhong Liu, MD

Neurology Physician in Alton, IL · enumerated 2006.

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

National Provider Identifier

1851402721

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Registry record

Entity type Individual (Type 1)

Name Michael Xiaozhong Liu

Credential MD

Sex Male

Practice address 4 Memorial Dr Ste 230, Alton, IL, 62002

Phone (618) 465-8666

Fax (618) 465-8670

Enumeration date Aug 31, 2006

Last updated in NPPES Mar 25, 2021

Taxonomy & licenses

2084N0400X Neurology Physician Allopathic & Osteopathic Physicians · License T2004015403 (MO) Secondary

2084N0400X Neurology Physician Allopathic & Osteopathic Physicians · License 2010011913 (MO) Secondary

2084N0400X Neurology Physician Allopathic & Osteopathic Physicians · License 036-122583 (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.

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Frequently asked questions

Is NPI 1851402721 active?

Yes, as of the latest NPPES snapshot, NPI 1851402721 is active (record last updated 2021-03-25).

How do I verify Michael Liu's NPI record?

Cross-check NPI 1851402721 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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David Riedel Gastroenterology Physician · Alton, IL NPI 1073505004 Ajitesh Rai Neurology Physician · Alton, IL NPI 1205883097 Mohammad Sajed Neurology Physician · Alton, IL NPI 1396785127 Mark Klucka Family Medicine Physician · Alton, IL NPI 1801902432 Christopher Aldridge Surgery Physician · Alton, IL NPI 1104026707 Wael Girgis Endocrinology, Diabetes & Metabolism Physician · Alton, IL NPI 1508053802 Tammy Vandermolen Family Nurse Practitioner · Alton, IL NPI 1588853741 Ann Laney Audiologist · Alton, IL NPI 1497904213

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-03-25.