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

Dr. Belton Douglas Hallmark, MD

Individual provider Family Medicine Physician · NPI 1225018633

Dr. Belton Douglas Hallmark, MD is a Family Practice in Castle Rock, Colorado. Graduated from University of Texas Medical Branch at Galveston in 1979, 47 years ago. Accepts Medicare assignment and offers telehealth. Licensed in Colorado.

Years since qualifying
47
Trained at
University of Texas Medical Branch at Galveston
Licensed in
CO
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

1189 S Perry St Ste 230
Castle Rock, CO 80104-1959
Phone: (303) 688-3434
Fax: (303) 688-4454
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

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

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence 23157 (CO)

Record details

NPI number1225018633
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJanuary 20, 2006
Last updated in NPPESJuly 11, 2023
Certification dateNovember 2, 2021

Medicare enrollment

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

Medicare specialtyFAMILY PRACTICE
Medical schoolUNIVERSITY OF TEXAS MEDICAL BRANCH AT GALVESTON
Graduated 1979 (47 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

Other providers in Castle Rock