John Marcum, MD
NPI 1720113053 · Allergy & Immunology Physician · St Clair, MO
John Marcum, MD is a Allergy & Immunology Physician provider in St Clair, MO (NPI 1720113053).
Provider details
- NPI number
- 1720113053
- Entity type
- Individual
- Primary specialty
- Allergy & Immunology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- R3G15 (MO)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-02-23
- Last updated
- 2014-06-26
Frequently asked questions
- What is John Marcum's NPI number?
- John Marcum's National Provider Identifier (NPI) is 1720113053, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Marcum's specialty?
- John Marcum is listed in the NPPES registry with a primary specialty of Allergy & Immunology Physician (Allopathic & Osteopathic Physicians).
- Where is John Marcum located?
- John Marcum's practice location on file with NPPES is 1020 St Clair Plaza, St Clair, MO 63077.
- What is John Marcum's phone number?
- The practice phone number listed in the NPPES registry for John Marcum is (636) 629-6030.
- Is John Marcum's NPI active?
- Yes — John Marcum's NPI (1720113053) is active in the NPPES registry as of the last update on 2014-06-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.