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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

WILLIAM HAHN M.D.
NPI 1386215655
Internal Medicine - Infectious Disease in Santa Barbara, CA

Active since July 07, 2021
SANTA BARBARA COTTAGE HOSPITAL, 400 W. PUEBLO STREET, SANTA BARBARA, CA 93105(805) 569-7315(805) 569-8358 Get Directions Write a Review

NPPES record last updated: August 19, 2026. Verified against the NPPES registry weekly; last sync: September 06, 2026.

Record update history: Aug 19, 2026, Jul 7, 2021 (2 updates tracked since 2021).

About William Hahn M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

WILLIAM HAHN M.D. (NPI 1386215655) is an individual infectious disease provider in Santa Barbara, California, licensed in Louisiana (353196) and active in the NPI registry since July 2021.

NPPES Registry Identity

NPI1386215655
Entity TypeIndividualMale
Primary Taxonomy207RI0200X
Provider Legal NameWILLIAM HAHNCredential: M.D.
Location AddressSANTA BARBARA COTTAGE HOSPITAL, 400 W. PUEBLO STREETSanta Barbara, CA 93105
Mailing Address400 W Pueblo StSanta Barbara, CA 93105-4353 · (805) 569-7315 · Fax (805) 569-8358
Phone(805) 569-7315
Fax(805) 569-8358
Sole ProprietorNo
Enumeration DateJuly 7, 2021
Last NPPES UpdateAugust 19, 20262 updates tracked since enumeration
NPPES CertifiedAugust 19, 2026
✔ NPI 1386215655 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Infectious DiseaseAllopathic & Osteopathic Physicians
Taxonomy Code207RI0200X
License✔ Licensed in LA · 353196
Definition
An internist who deals with infectious diseases of all types and in all organ systems. Conditions requiring selective use of antibiotics call for this special skill. This physician often diagnoses and treats AIDS patients and patients with fevers which have not been explained. Infectious disease specialists may also have expertise in preventive medicine and travel medicine.
SANTA BARBARA COTTAGE HOSPITAL, Santa Barbara, CA 93105
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Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

YANA DAVIDOVNA GRISTAN MD
Internal Medicine
SANTA BARBARA COTTAGE HOSPITAL, 400 WEST PUEBLO ST
SANTA BARBARA, CA 93105
Santa Barbara County (805) 682-7111
ADRIAN THOMAS MOY MD
Student in an Organized Health Care Education/Training Program
SANTA BARBARA COTTAGE HOSPITAL, 400 W. PUEBLO STREET
SANTA BARBARA, CA 93105
Santa Barbara County (805) 569-7316
MADELINE ROSE ABUELAFIYA D.O.
Student in an Organized Health Care Education/Training Program
SANTA BARBARA COTTAGE HOSPITAL, 400 W. PUEBLO STREET
SANTA BARBARA, CA 93105
Santa Barbara County (805) 569-7315
ELLIOTT LEBBY MD
Student in an Organized Health Care Education/Training Program
SANTA BARBARA COTTAGE HOSPITAL, 400 W. PUEBLO STREET
SANTA BARBARA, CA 93105
Santa Barbara County (805) 569-7315
MINGXUE WANG MD
Student in an Organized Health Care Education/Training Program
SANTA BARBARA COTTAGE HOSPITAL, 400 W. PUEBLO STREET
SANTA BARBARA, CA 93105
Santa Barbara County (805) 569-7316
TREVOR J STOLTZFUS DO
Student in an Organized Health Care Education/Training Program
SANTA BARBARA COTTAGE HOSPITAL, 400 W PUEBLO STREET
SANTA BARBARA, CA 93105
Santa Barbara County (805) 569-7315
MEGAN QUAN M.D.
Student in an Organized Health Care Education/Training Program
SANTA BARBARA COTTAGE HOSPITAL, 400 W. PUEBLO STREET
SANTA BARBARA, CA 93105
Santa Barbara County (805) 569-7315
RICARDO ESPINOZA MD
Student in an Organized Health Care Education/Training Program
SANTA BARBARA COTTAGE HOSPITAL, 400 W PUEBLO STREET
SANTA BARBARA, CA 93105
Santa Barbara County (805) 569-7315

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is William Hahn's NPI number?

The NPI number for William Hahn is 1386215655. It was assigned to this individual provider in the NPPES registry on July 7, 2021.

Where is William Hahn located?

William Hahn practices at Santa Barbara Cottage Hospital 400 W. Pueblo Street, Santa Barbara, CA 93105. The listed phone number is (805) 569-7315.

What is William Hahn's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Infectious Disease, with taxonomy code 207RI0200X.

When was this NPI record last updated?

The NPPES record for William Hahn was last updated on August 19, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 21 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.