Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Nathaniel Seth Laden, M.D., M.S.

Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician in Milwaukee, WI · enumerated 2006.

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

National Provider Identifier

1356316889

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Registry record

Entity type Individual (Type 1)

Name Nathaniel Seth Laden

Credential M.D., M.S.

Sex Male

Practice address 9200 W Wisconsin Ave, Cardiothoracic Surgery, Milwaukee, WI, 53226

Phone (414) 955-6900

Fax (414) 955-6204

Enumeration date Feb 20, 2006

Last updated in NPPES May 2, 2016

Taxonomy & licenses

208G00000X Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician Allopathic & Osteopathic Physicians · License 35.071969L (OH) Secondary

208G00000X Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician Allopathic & Osteopathic Physicians · License 18081 (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
2551671	Other	OH	PARTNERS PHYSICIAN GROUP MEDICAID GROUP #
2097065	Medicaid	OH	-
9338635	Other	OH	PARTNERS PHYSICIAN GROUP MEDICARE GROUP #
1841239274	Other	OH	PARTNERS PHYSICIAN GROUP TYPE 2 NPI #

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 1356316889 active?

Yes, as of the latest NPPES snapshot, NPI 1356316889 is active (record last updated 2016-05-02).

How do I verify Nathaniel Laden's NPI record?

Cross-check NPI 1356316889 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Other providers at this practice address

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Anthony De Franco Cardiovascular Disease Physician · Milwaukee, WI NPI 1215930391 Froedtert Memorial Lutheran Hospital, Inc. General Acute Care Hospital · Milwaukee, WI NPI 1255334173 John Nettrour Orthopaedic Surgery Physician · Milwaukee, WI NPI 1457355810 Melissa Anglin Anesthesiology Physician · Milwaukee, WI NPI 1174522130 Wisconsin Diagnostic Laboratories LLC Clinical Medical Laboratory · Milwaukee, WI NPI 1932109675 Hakki Bolukoglu Cardiovascular Disease Physician · Milwaukee, WI NPI 1356341176 Susan Skaros Medical Physician Assistant · Milwaukee, WI NPI 1699775262 Gary Scherr Anatomic Pathology & Clinical Pathology Physician · Milwaukee, WI NPI 1083614341

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-05-02.