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
Mailing address1020 St Clair Plaza, St Clair, MO 63077