Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
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MS. Mary H Holtgrewe-Seib, CRNA

Individual provider Certified Registered Nurse Anesthetist · NPI 1619940707

MS. Mary H Holtgrewe-Seib, CRNA is registered under Certified Registered Nurse Anesthetist (CRNA) in Saint Louis, Missouri. Qualified in 2000, 26 years ago. Practices with Midwest Anesthesia Providers SC, a 182-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Missouri.

Years since qualifying
26
Licensed in
MO
In the registry since
2006
What do these letters mean?
CRNA — Certified Registered Nurse Anesthetist
An advanced practice nurse who administers anaesthesia.

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Practice location Address checks out

12634 Olive Blvd
Saint Louis, MO 63141-6337
Phone: (314) 996-8378
Fax: (314) 996-8910
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 3015 N Ballas Rd, Saint Louis, MO 63131-2329 — (314) 996-5000

Specialties & licences

Certified Registered Nurse Anesthetist (primary) Taxonomy 367500000X · Licence 2001012891 (MO)

Record details

NPI number1619940707
Entity typeIndividual (Type 1)
GenderFemale
Credentials CRNA
Sole proprietorNo
NPI enumeratedFebruary 9, 2006
Last updated in NPPESSeptember 29, 2026
Certification dateAugust 14, 2026

Medicare enrollment

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

Medicare specialtyCERTIFIED REGISTERED NURSE ANESTHETIST (CRNA)
Medical schoolOTHER
Graduated 2000 (26 years in practice)
Group practice Midwest Anesthesia Providers Sc — 182 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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 patients74
Services billed 75 a service is one billed item, such as a visit, a test or a procedure
Average patient age72

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.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $89 4 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Midwest Anesthesia Providers SC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 182 clinicians in the practice; 12 are shown here.

Other providers in Saint Louis