Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mark D Guadagnoli, M.D.

Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician in Loveland, CO · enumerated 2005.

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

National Provider Identifier

1043208259

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Registry record

Entity type Individual (Type 1)

Name Dr. Mark D Guadagnoli

Credential M.D.

Sex Male

Practice address 2500 Rocky Mountain Ave, Ste 100, Loveland, CO, 80538

Phone (970) 624-1800

Fax (970) 624-1891

Enumeration date Oct 11, 2005

Last updated in NPPES Dec 7, 2022

Taxonomy & licenses

2086S0129X Vascular Surgery Physician Allopathic & Osteopathic Physicians · License 29590 (CO) Secondary

208G00000X Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician Allopathic & Osteopathic Physicians · License 5495A (WY) Secondary

208G00000X Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician Allopathic & Osteopathic Physicians · License 29590 (CO) 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
111738600	Medicaid	WY	-
01295906	Medicaid	CO	-
1043208259	Medicaid	NE	-
P00970371	Other	CO	RAILROAD MEDICARE

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 NPI 1043208259 active?

Yes, as of the latest NPPES snapshot, NPI 1043208259 is active (record last updated 2022-12-07).

How do I verify Mark Guadagnoli's NPI record?

Cross-check NPI 1043208259 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

Browse all →

Lynn Kincanon Adult Health Nurse Practitioner · Loveland, CO NPI 1356347751 William Lopez Internal Medicine Physician · Loveland, CO NPI 1023015807 Heart Center of the Rockies Cath Lab LLC Interventional Cardiology Physician · Loveland, CO NPI 1811999758 Julie Dunn Surgery Physician · Loveland, CO NPI 1972596070 Susan Bush Advanced Practice Midwife · Loveland, CO NPI 1477541050 Michael Stanton Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · Loveland, CO NPI 1871581090 Richard Milchak Pulmonary Disease Physician · Loveland, CO NPI 1740271063 Pamela Levine Family Medicine Physician · Loveland, CO NPI 1669454542

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-12-07.