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

Dr. Cyrene D Grothaus-Day, MD

Individual provider Pediatric Anesthesiology Physician · NPI 1407872625

Dr. Cyrene D Grothaus-Day, MD is a Pediatric Anesthesiology Physician in Fenton, Missouri. Licensed in Illinois and Missouri. Registered with an NPI since 2006.

Licensed in
IL, MO
In the registry since
2006
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

1378 Mosswoods Dr
Fenton, MO 63026-7226
Phone: (636) 861-1676
Show map & directions

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

Specialties & licences

Pediatric Anesthesiology Physician (primary) Taxonomy 207LP3000X · Licence 2003019558 (MO)
Pediatric Anesthesiology Physician Taxonomy 207LP3000X · Licence 036-126419 (IL)

Record details

NPI number1407872625
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 14, 2006
Last updated in NPPESSeptember 8, 2025
Certification dateSeptember 8, 2025

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 patients150
Services billed 153 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

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.