Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Stan L Markus, MD
Surgery Physician in Oconomowoc, WI · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1134103641
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Registry record
Entity type Individual (Type 1)
Name Dr. Stan L Markus
Credential MD
Sex Male
Practice address 888 Thackeray Trl Ste 103, Oconomowoc, WI, 53066
Phone (262) 567-1499
Fax (262) 567-4502
Enumeration date Nov 30, 2005
Last updated in NPPES Nov 29, 2017
Taxonomy & licenses
208C00000X Colon & Rectal Surgery Physician Allopathic & Osteopathic Physicians · License 28258 (WI) 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 |
|---|---|---|---|
| 30821400 | Medicaid | WI | - |
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.
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 Stan Markus?
Stan Markus is registered in NPPES with the primary taxonomy of Surgery Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Other providers at this practice address
Browse all → Eric Elliot Physician Assistant · Oconomowoc, WI NPI 1508825605 Cynthia Pangallo Surgery Physician · Oconomowoc, WI NPI 1710946132 Emily Stoddard Surgery Physician · Oconomowoc, WI NPI 1457311441 Allegiance Medical, Inc. Internal Medicine Physician · Oconomowoc, WI NPI 1831862895 Primelife Health and Wellness Integrative Medicine Physician · Oconomowoc, WI NPI 1265230601
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2017-11-29.