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

Mrs. Katharine Cella Fash, FNP

Individual provider Nurse Practitioner · NPI 1598238917

Mrs. Katharine Cella Fash, FNP is a Nurse Practitioner in Saint Louis, Missouri. Graduated from Vanderbilt University School of Medicine in 2018, 8 years ago. Practices with Washington University, a 2,986-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Missouri.

Years since qualifying
8
Trained at
Vanderbilt University School of Medicine
Licensed in
MO
In the registry since
2019
What do these letters mean?
FNP — Family Nurse Practitioner
A nurse practitioner who treats patients of all ages, much like a family doctor.

See every abbreviation used in this directory →

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Practice location Address checks out

1044 N Mason Rd Div Im General Med Ste 330
Saint Louis, MO 63141-6431
Phone: (314) 996-8103
Fax: (314) 996-3230
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Nurse Practitioner (primary) Taxonomy 363L00000X · Licence 2019000563 (MO)

Record details

NPI number1598238917
Entity typeIndividual (Type 1)
GenderFemale
Credentials FNP
Sole proprietorNo
NPI enumeratedJanuary 8, 2019
Last updated in NPPESJune 19, 2025
Certification dateJune 19, 2025

Medicare enrollment

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

Medicare specialtyNURSE PRACTITIONER
Medical schoolVANDERBILT UNIVERSITY SCHOOL OF MEDICINE
Graduated 2018 (8 years in practice)
Group practice Washington University — 2986 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients173
Services billed 372 a service is one billed item, such as a visit, a test or a procedure
Average patient age71

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Colleagues at Washington University

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 2986 clinicians in the practice; 12 are shown here.

Other providers in Saint Louis