Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Antonio Santiago-Agostini, MD

Internal Medicine Physician in Owosso, MI · enumerated 2006.

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

National Provider Identifier

1801834445

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Registry record

Entity type Individual (Type 1)

Name Dr. Antonio Santiago-Agostini

Credential MD

Sex Male

Practice address 300 Health Park Dr Ste 302, Owosso, MI, 48867

Phone (989) 723-5540

Fax (989) 720-2292

Enumeration date Jun 4, 2006

Last updated in NPPES Jun 17, 2020

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 4301054955 (MI) 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
1801834445	Medicaid	MI	-

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 1801834445 active?

Yes, as of the latest NPPES snapshot, NPI 1801834445 is active (record last updated 2020-06-17).

How do I verify Antonio Santiago-Agostini's NPI record?

Cross-check NPI 1801834445 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-06-17.