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

Dr. John Mark Williams, MD

Individual provider Allergy & Immunology Physician · NPI 1467596189

Dr. John Mark Williams, MD is an Allergy & Immunology Physician in Denver, Colorado. Licensed in Colorado. Registered with an NPI since 2007.

Licensed in
CO
In the registry since
2007
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

10350 E Dakota Ave
Denver, CO 80247-1314
Phone: (303) 338-4545
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 28411 (CO)

Record details

NPI number1467596189
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedFebruary 16, 2007
Last updated in NPPESJune 8, 2021
Certification dateJune 8, 2021
Mailing address10350 E Dakota Ave, Denver, CO 80247-1314

Other providers in Denver