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

Mr. John D Marcum, MD

Individual provider Allergy & Immunology Physician · NPI 1720113053

Mr. John D Marcum, MD is an Allergy & Immunology Physician in St. Clair, Missouri. Licensed in California and Missouri. Registered with an NPI since 2007.

Licensed in
CA, MO
In the registry since
2007
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

1020 St Clair Plz
St. Clair, MO 63077
Phone: (636) 629-6030
Fax: (636) 629-6030
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Allergy & Immunology Physician (primary) Taxonomy 207K00000X · Licence R3G15 (MO)
Allergy & Immunology Physician Taxonomy 207K00000X · Licence G38741 (CA)

Record details

NPI number1720113053
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedFebruary 23, 2007
Last updated in NPPESJune 26, 2014