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

Individual provider Family Medicine Physician · NPI 1982017786

Dr. Alexander John Mazzaferro, MD is registered under Family Practice in Saint Louis, Missouri. Graduated from Saint Louis University School of Medicine in 2014, 12 years ago. Practices with Mercy Clinic East Communities, a 573-clinician group, works from 2 locations, accepts Medicare assignment and offers telehealth. Licensed in Missouri.

Years since qualifying
12
Trained at
Saint Louis University School of Medicine
Licensed in
MO
In the registry since
2014
Specialties on file
2
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

4280 Mid America Ln Ste 30
Saint Louis, MO 63129-1202
Phone: (314) 782-2620
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 615 S New Ballas Rd, Saint Louis, MO 63141-8221 — (314) 251-8888

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence 2017018127 (MO)
Family Medicine Physician Taxonomy 207Q00000X · Licence 2014017191 (MO)

Record details

NPI number1982017786
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedJune 9, 2014
Last updated in NPPESMarch 17, 2018

Medicare enrollment

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

Medicare specialtyFAMILY PRACTICE
Medical schoolSAINT LOUIS UNIVERSITY SCHOOL OF MEDICINE
Graduated 2014 (12 years in practice)
Group practice Mercy Clinic East Communities — 573 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Skin biopsy 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

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 patients191
Services billed 1,187 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.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Mercy Clinic East Communities

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 573 clinicians in the practice; 12 are shown here.

Other providers in Saint Louis