Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Graham Luke Machen, M.D.
Urology Physician in Milwaukee, WI · enumerated 2013.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1447695317
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Registry record
Entity type Individual (Type 1)
Name Graham Luke Machen
Credential M.D.
Sex Male
Practice address 9200 W Wisconsin Ave, Milwaukee, WI, 53226
Phone (414) 805-0805
Fax (414) 955-0122
Enumeration date May 6, 2013
Last updated in NPPES Jun 22, 2018
Taxonomy & licenses
208800000X Urology Physician Allopathic & Osteopathic Physicians · License BP10047349 (TX) 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 |
|---|---|---|---|
| 1447695317 | 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 Graham Machen?
Graham Machen is registered in NPPES with the primary taxonomy of Urology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-06-22.