Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Alexander Michael Mason, MD

Neurological Surgery Physician in Saint Paul, MN · enumerated 2007.

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

National Provider Identifier

1275758039

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Registry record

Entity type Individual (Type 1)

Name Alexander Michael Mason

Credential MD

Sex Male

Practice address 640 Jackson St, Saint Paul, MN, 55101

Phone (651) 495-6600

Fax (651) 254-3123

Enumeration date Apr 16, 2007

Last updated in NPPES Jan 19, 2026

Taxonomy & licenses

207T00000X Neurological Surgery Physician Allopathic & Osteopathic Physicians · License 59933 (MN) Secondary

207T00000X Neurological Surgery Physician Allopathic & Osteopathic Physicians · License DR-46397 (CO) Secondary

207T00000X Neurological Surgery Physician Allopathic & Osteopathic Physicians · License 57002649 (OH) Secondary

207T00000X Neurological Surgery Physician Allopathic & Osteopathic Physicians · License 96060 (SC) 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

Where does Alexander Mason practice?

The practice location on file with NPPES is in Saint Paul, MN. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Alexander Mason?

The National Provider Identifier (NPI) for Alexander Mason is 1275758039, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Margaret Schnobrich Certified Registered Nurse Anesthetist · Saint Paul, MN NPI 1780686378 Ruth Lindeman Physician Assistant · Saint Paul, MN NPI 1578559928 Douglas Boehm Cardiovascular Disease Physician · Saint Paul, MN NPI 1215923172 Jennifer Libby Physician Assistant · Saint Paul, MN NPI 1497742035 Christopher Haynes Adult Health Nurse Practitioner · St. Paul, MN NPI 1275523193 Joseph Uzpen Physician Assistant · Saint Paul, MN NPI 1043200389 Ranjan Dahiya Cardiovascular Disease Physician · Saint Paul, MN NPI 1942282074 Kenneth Baran Interventional Cardiology Physician · Saint Paul, MN NPI 1962485797

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-01-19.