1. Home
  2. Directory
  3. Missouri
  4. Fenton
  5. Anesthesiology
  6. NPI Profile

DR. CYRENE D GROTHAUS-DAY MD
NPI 1407872625
Anesthesiology - Pediatric Anesthesiology in Fenton, MO

Active since July 14, 2006PECOS Enrolled
1378 MOSSWOODS DR, FENTON, MO 63026(636) 861-1676 Get Directions Write a Review

NPPES record last updated: September 8, 2025. Verified against the NPPES registry weekly; last sync: November 08, 2026.

Record update history: Sep 8, 2025, Mar 1, 2022, Jan 4, 2021 and 1 more (4 updates tracked since 2020).

About Dr. Cyrene D Grothaus-day Md NPPES

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

DR. CYRENE D GROTHAUS-DAY MD (NPI 1407872625) is an individual pediatric anesthesiology provider in Fenton, Missouri, licensed in Missouri (2003019558) and active in the NPI registry since July 2006. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1407872625
Entity TypeIndividualFemale
Primary Taxonomy207LP3000X
Provider Legal NameDR. CYRENE D GROTHAUS-DAYCredential: MD
Location Address1378 MOSSWOODS DRFenton, MO 63026-7226
Mailing Address335 Davis DrHolts Summit, MO 65043-2135 · (561) 320-2958
Phone(636) 861-1676
Sole ProprietorNo
Enumeration DateJuly 14, 2006
Last NPPES UpdateSeptember 8, 20254 updates tracked since enumeration
NPPES CertifiedSeptember 8, 2025
✔ NPI 1407872625 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyAnesthesiology · Pediatric AnesthesiologyAllopathic & Osteopathic Physicians
Taxonomy Code207LP3000X
Licenses✔ Licensed in MO · 2003019558✔ Licensed in IL · 036-126419
Definition
An anesthesiologist who has had additional skill and experience in and is primarily concerned with the anesthesia, sedation, and pain management needs of infants and children. A pediatric anesthesiologist generally provides services including the evaluation of complex medical problems in infants and children when surgery is necessary, planning and care for children before and after surgery, pain control, anesthesia and sedation for any procedures out of the operating room such as MRI, CT scan, and radiation therapy.
1378 MOSSWOODS DR, Fenton, MO 63026
Open in Google Maps ↗

Other Identifiers 3

Medicaid204893622MO
Medicaid036126419IL
Other336Mo-blue Shield

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Cyrene D Grothaus-day Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

2

Medicare enrollment records show Cyrene Grothaus-day reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Resource Anesthesiology Associates Of Mo LLC
122 mi
Anesthesiology
1008 N MAIN ST
Sikeston, MO 63801
  • Reassigned Medicare billing, Missouri enrollment
  • 33 clinicians in this Medicare group
NPI 1396116521 (914) 637-2063
Northstar Anesthesia Of Illinois, LLC
542 mi
Anesthesiology
2000 E LAMAR BLVD STE 400
Arlington, TX 76006
  • Reassigned Medicare billing, Illinois enrollment
  • 735 clinicians in this Medicare group
NPI 1962822395 (817) 583-7421

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 4

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Anesthesia for other procedure on large bowel using an endoscope 00811
Anesthesia for an endoscopic procedure on the large bowel ensures comfort and relaxation during the procedure. You'll be given medication to make you drowsy or asleep, eliminating any discomfort. The medication can be administered through a vein or inhaled.
60 services59 patients
Anesthesia for procedure on small and large bowel using an endoscope 00813
Anesthesia for an endoscopic procedure on the small and large bowel ensures comfort and relaxation during the procedure. It involves administering medicine to help you sleep or feel drowsy. This allows the doctor to examine your bowels without causing you discomfort or pain.
38 services38 patients
Anesthesia for other procedure on esophagus, stomach, or upper small bowel using an endoscope 00731
This procedure involves the use of an endoscope, a flexible tube with a light and camera, to examine your esophagus, stomach, or upper small bowel. Anesthesia ensures you are comfortable and pain-free during the procedure.
32 services31 patients
Anesthesia for exam of colon using an endoscope 00812
Anesthesia for a colon examination with an endoscope is a method used to ensure comfort during the procedure. It involves administering medication to help you relax or sleep, thus reducing discomfort as the endoscope, a thin, flexible tube, is navigated through your colon.
13 services12 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 63026 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$128.28 typical visit price
range $55.65 – $169.38
Typical copayment $32.07 (range $13.91 – $42.34)
Most-billed visit code 99204
Established Patient
$69.50 typical visit price
range $17.76 – $137.92
Typical copayment $17.37 (range $4.44 – $34.48)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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 Cyrene Grothaus-day's NPI number?

The NPI number for Cyrene Grothaus-day is 1407872625. It was assigned to this individual provider in the NPPES registry on July 14, 2006.

Where is Cyrene Grothaus-day located?

Cyrene Grothaus-day practices at 1378 Mosswoods Dr, Fenton, MO 63026. The listed phone number is (636) 861-1676.

What is Cyrene Grothaus-day's specialty?

The primary specialty registered for this NPI is Anesthesiology, specializing in Pediatric Anesthesiology, with taxonomy code 207LP3000X.

Is Cyrene Grothaus-day enrolled in Medicare?

Yes. Cyrene Grothaus-day is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Cyrene Grothaus-day's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Cyrene Grothaus-day reassigns Medicare benefits to 2 organizations: Resource Anesthesiology Associates Of Mo LLC (Sikeston, MO) and Northstar Anesthesia Of Illinois, LLC (Arlington, TX). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Cyrene Grothaus-day's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Cyrene Grothaus-day was last updated on September 8, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 months 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.