Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Mark Wesselman, MD

Internal Medicine Physician in Denver, CO · enumerated 2007 · practices at Perfect Teeth - Speer P.C..

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

National Provider Identifier

1598822124

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Registry record

Entity type Individual (Type 1)

Name Dr. Mark Wesselman

Credential MD

Sex Male

Practice address Denver, CO, 80203

Phone (303) 335-9742

Fax (303) 265-9457

Enumeration date Jan 2, 2007

Last updated in NPPES Sep 26, 2024

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 91347 (NM) Secondary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License DR.0056888 (CO) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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

How do I verify Mark Wesselman's NPI record?

Cross-check NPI 1598822124 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1598822124 active?

Yes, as of the latest NPPES snapshot, NPI 1598822124 is active (record last updated 2024-09-26).

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Bryan Gibbs General Practice Dentistry · Denver, CO NPI 1821081829 Perfect Teeth - Speer P.C. General Practice Dentistry · Denver, CO NPI 1386765774 Ned Targos General Practice Dentistry · Denver, CO NPI 1043498694 Gavin Trogdon Dentist · Denver, CO NPI 1093026031 Nicole Sheeder Family Nurse Practitioner · Denver, CO NPI 1922681600

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-09-26.