Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Michael E Mandis, MD

Internal Medicine Physician in Maryville, IL · enumerated 2006.

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

National Provider Identifier

1821065764

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Registry record

Entity type Individual (Type 1)

Name Dr. Michael E Mandis

Credential MD

Sex Male

Practice address 2236 Vadalabene Dr, Suite 2, Maryville, IL, 62062

Phone (618) 288-6136

Fax (618) 288-6143

Enumeration date Feb 28, 2006

Last updated in NPPES Mar 31, 2020

Taxonomy & licenses

207P00000X Emergency Medicine Physician Allopathic & Osteopathic Physicians · License 036112094 (IL) Secondary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 036112094 (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
I23797	Other	-	MERCY
036112094	Medicaid	IL	-
036112094-3	Medicaid	IL	-
P00265571	Other	-	MEDICARE RAILROAD
036112094-5	Medicaid	IL	-
1821065764	Medicaid	MO	-
06032146	Other	IL	BLUE CROSS ILLINOIS
202790173	Other	-	TRICARE
7496677	Other	-	AETNA
241366	Other	-	GHP
701184	Other	-	HEALTHLINK
199147	Other	MO	BLUE SHIELD MO

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

What specialty is Michael Mandis?

Michael Mandis is registered in NPPES with the primary taxonomy of Internal Medicine Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

Other providers at this practice address

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Jennifer Wesselman-Williams Nurse Practitioner · Maryville, IL NPI 1073843967 Samantha Munro Family Nurse Practitioner · Maryville, IL NPI 1942089768

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-03-31.