Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Willard Chamberlin, DO

Individual provider Anesthesiology Physician · NPI 1437132818

Willard Chamberlin, DO practises Anesthesiology in Saint Charles, Missouri. Graduated from At Still University of Health Sciences, College of Osteo Med, Kirksville in 1980, 46 years ago. Practices with Metro-West Anesthesia Group Inc, a 205-clinician group and accepts Medicare assignment. Licensed in Missouri.

Years since qualifying
46
Trained at
At Still University of Health Sciences, College of Osteo Med, Kirksville
Licensed in
MO
In the registry since
2005
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

300 1st Capitol Dr
Saint Charles, MO 63301-2844 Not confirmed with CMS for 18 years — call before visiting
Phone: (314) 989-3000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Anesthesiology Physician (primary) Taxonomy 207L00000X · Licence R6E81 (MO)

Record details

NPI number1437132818
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedNovember 21, 2005
Last updated in NPPESApril 29, 2008

Medicare enrollment

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

Medicare specialtyANESTHESIOLOGY
Medical schoolAT STILL UNIVERSITY OF HEALTH SCIENCES, COLLEGE OF OSTEO MED, KIRKSVILLE
Graduated 1980 (46 years in practice)
Group practice Metro-West Anesthesia Group Inc — 205 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 patients11
Services billed 11 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.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Metro-West Anesthesia Group Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 205 clinicians in the practice; 12 are shown here.

Other providers in Saint Charles