Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Jonathan S Warnelo, D.O.

Internal Medicine Physician in Garden Grove, CA · enumerated 2017.

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

National Provider Identifier

1467980854

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Registry record

Entity type Individual (Type 1)

Name Jonathan S Warnelo

Credential D.O.

Sex Male

Practice address 12665 Garden Grove Blvd, #502, Garden Grove, CA, 92843

Phone (714) 537-7800

Fax (714) 537-7633

Enumeration date May 30, 2017

Last updated in NPPES Sep 20, 2019

Taxonomy & licenses

208M00000X Hospitalist Physician Allopathic & Osteopathic Physicians · License 20A16595 (CA) Secondary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 20A16595 (CA) Primary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO 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

What specialty is Jonathan Warnelo?

Jonathan Warnelo 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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-09-20.