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

Dr. John D Merwin, MD

Individual provider Anesthesiology Physician · NPI 1770562209

Dr. John D Merwin, MD practises Anesthesiology in Saint Louis, Missouri. Graduated from University of Texas Medical School at San Antonio in 1985, 41 years ago. Practices with SSM Health Slu Hospital Anesthesia Physician Billing LLC, a 96-clinician group and accepts Medicare assignment. Licensed in Missouri.

Years since qualifying
41
Trained at
University of Texas Medical School at San Antonio
Licensed in
MO
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

10925 Brooktrail Ct
Saint Louis, MO 63141-8304 Not confirmed with CMS for 16 years — call before visiting
Phone: (314) 473-6800
Fax: (314) 473-6800
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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 100344 (MO)

Record details

NPI number1770562209
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJanuary 12, 2006
Last updated in NPPESMarch 5, 2010

Medicare enrollment

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

Medicare specialtyANESTHESIOLOGY
Medical schoolUNIVERSITY OF TEXAS MEDICAL SCHOOL AT SAN ANTONIO
Graduated 1985 (41 years in practice)
Group practice Ssm Health Slu Hospital Anesthesia Physician Billing Llc — 96 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 patients182
Services billed 201 a service is one billed item, such as a visit, a test or a procedure
Average patient age70

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 SSM Health Slu Hospital Anesthesia Physician Billing LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 96 clinicians in the practice; 12 are shown here.

Other providers in Saint Louis