Mountain Rheumatology Mountain Rheumatology Mountain Rheumatology. Mountain Rheumatology Mountain Rheumatology Mountain Rheumatology Mountain Rheumatology. Home; Our Doctors; Patient Information; COVID-19 Response; More. ... Patient Portal. 4500 E 9th Ave. Ste 500 S Denver, CO 80220. Phone: 303-861-2190 Fax: 303-355-4435 ....