Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Efrain Sueldo, MD

Internal Medicine Physician in Eau Claire, WI · enumerated 2005.

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

National Provider Identifier

1750389995

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Registry record

Entity type Individual (Type 1)

Name Efrain Sueldo

Credential MD

Sex Male

Practice address 2116 Craig Rd, Eau Claire, WI, 54701

Phone (715) 858-4500

Enumeration date Jul 12, 2005

Last updated in NPPES Nov 17, 2022

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 4301059151 (MI) Secondary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 37557 (WI) 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
32266800	Medicaid	WI	-
700B710030	Other	-	BCBS
3414502	Medicaid	MI	-
1018462	Other	-	PREFERREDONE
12D84SU	Other	MN	BCBS

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 Efrain Sueldo?

Efrain Sueldo 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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-11-17.