Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William Ortiz, MD

Internal Medicine Physician in Caribou, ME · enumerated 2006.

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

National Provider Identifier

1881781615

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Registry record

Entity type Individual (Type 1)

Name William Ortiz

Credential MD

Sex Male

Practice address 46 Sweden St, 2nd Floor, Caribou, ME, 04736

Phone (207) 999-1180

Fax (413) 794-1629

Enumeration date Oct 5, 2006

Last updated in NPPES Nov 26, 2013

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 156739 (MA) 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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does William Ortiz practice?

The practice location on file with NPPES is in Caribou, ME. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for William Ortiz?

The National Provider Identifier (NPI) for William Ortiz is 1881781615, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-11-26.