Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
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Mark Thomas Holley, MD

Individual provider Emergency Medical Services (Emergency Medicine) Physician · NPI 1588673107

Mark Thomas Holley, MD practises Emergency Medicine in Denver, Colorado. Qualified in 1994, 32 years ago. Practices with Usacs Community Emergency Services of Colorado Inc, a 167-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Colorado.

Years since qualifying
32
Licensed in
CO
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

2227 W 35th Ave
Denver, CO 80211
Phone: (303) 455-0815
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 1400 Jackson St, Denver, CO 80206 — (303) 388-4461

Specialties & licences

Emergency Medical Services (Emergency Medicine) Physician (primary) Taxonomy 207PE0004X · Licence 36330 (CO)

Record details

NPI number1588673107
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedAugust 5, 2006
Last updated in NPPESApril 30, 2021
Certification dateApril 30, 2021

Medicare enrollment

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

Medicare specialtyEMERGENCY MEDICINE
Medical schoolOTHER
Graduated 1994 (32 years in practice)
Group practice Usacs Community Emergency Services Of Colorado Inc. — 167 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations4 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients176
Services billed 218 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

  • AdventHealth Littleton Hospital · Littleton, CO

Colleagues at Usacs Community Emergency Services of Colorado Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 167 clinicians in the practice; 12 are shown here.

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