Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Alexandra N Willauer, MD
Hospitalist Physician in Boston, MA · enumerated 2020.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1386271666
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Registry record
Entity type Individual (Type 1)
Name Dr. Alexandra N Willauer
Credential MD
Sex Female
Practice address 55 Fruit St, Boston, MA, 02114
Phone (617) 726-2426
Enumeration date Mar 25, 2020
Last updated in NPPES Jul 10, 2025
Taxonomy & licenses
207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 35.147077 (OH) Secondary
208M00000X Hospitalist Physician Allopathic & Osteopathic Physicians · License 35.147077 (OH) Secondary
390200000X Student in an Organized Health Care Education/Training Program Student, Health Care Secondary
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.
Frequently asked questions
What is the NPI number for Alexandra Willauer?
The National Provider Identifier (NPI) for Alexandra Willauer is 1386271666, a Type 1 (individual) record in the CMS NPPES registry.
Where does Alexandra Willauer practice?
The practice location on file with NPPES is in Boston, MA. Providers can have multiple locations; NPPES lists the primary practice address.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-07-10.