Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

MS. Olivia Faeth Hasselfeld, PA

Individual provider Physician Assistant · NPI 1194334094

MS. Olivia Faeth Hasselfeld, PA is a Physician Assistant in O Fallon, Missouri. Qualified in 2020, 6 years ago. Practices with Washington University, a 2,986-clinician group and accepts Medicare assignment. Licensed in Missouri.

Years since qualifying
6
Licensed in
MO
In the registry since
2020
What do these letters mean?
PA — Physician Assistant
A licensed clinician who examines, diagnoses and treats under a physician's supervision.

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Practice location Address checks out

2 Progress Point Pkwy Div Im Medical Oncology
O Fallon, MO 63368-2205
Phone: (800) 647-2098
Fax: (314) 362-3192
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Physician Assistant (primary) Taxonomy 363A00000X · Licence 2020026369 (MO)

Record details

NPI number1194334094
Entity typeIndividual (Type 1)
GenderFemale
Credentials PA
Sole proprietorNo
NPI enumeratedJuly 27, 2020
Last updated in NPPESApril 17, 2025
Certification dateDecember 19, 2023
Mailing addressPo Box 7412011, Chicago, IL 60674-2011

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyPHYSICIAN ASSISTANT
Medical schoolOTHER
Graduated 2020 (6 years in practice)
Group practice Washington University — 2986 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

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