Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Oswald Llanderosos, M.D.

Nephrology Physician in Norman, OK · enumerated 2005.

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

National Provider Identifier

1679554737

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Registry record

Entity type Individual (Type 1)

Name Mr. Oswald Llanderosos

Credential M.D.

Sex Male

Practice address 1553 N Porter Ave, Norman, OK, 73071

Phone (405) 217-8500

Fax (405) 217-8501

Enumeration date Nov 7, 2005

Last updated in NPPES Nov 18, 2009

Taxonomy & licenses

207RN0300X Nephrology Physician Allopathic & Osteopathic Physicians · License 11647 (OK) 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
100108050A	Medicaid	OK	-

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 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.

What specialty is Oswald Llanderosos?

Oswald Llanderosos is registered in NPPES with the primary taxonomy of Nephrology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-11-18.