Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Peter H. Marks, M.D.

Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician in Beloit, WI · enumerated 2006 · practices at Beloit Health System, Inc.

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

National Provider Identifier

1558327320

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Registry record

Entity type Individual (Type 1)

Name Dr. Peter H. Marks

Credential M.D.

Sex Male

Practice address 1969 W. Hart Road, Beloit Health System Inc, Beloit, WI, 53511

Phone (608) 364-5011

Fax (608) 364-5593

Enumeration date Apr 21, 2006

Last updated in NPPES Feb 27, 2013

Taxonomy & licenses

208G00000X Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician Allopathic & Osteopathic Physicians · License 45518-20 (WI) Primary

208G00000X Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician Allopathic & Osteopathic Physicians · License 036-060891 (IL) Secondary

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
1558327320	Medicaid	WI	-
036060891	Medicaid	IL	-

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 Peter Marks?

Peter Marks is registered in NPPES with the primary taxonomy of Thoracic Surgery (Cardiothoracic Vascular Surgery) 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 2013-02-27.