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

John Aaron Cook, DO

Individual provider Student in an Organized Health Care Education/Training Program · NPI 1851737498

John Aaron Cook, DO practises Emergency Medicine in Fort Collins, Colorado. Qualified in 2013, 13 years ago. Practices with Emergency Physicians of the Rockies, PC, a 79-clinician group and accepts Medicare assignment. Licensed in Colorado and Illinois.

Years since qualifying
13
Licensed in
CO, IL
In the registry since
2013
Specialties on file
2
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

Student / training record This NPI belongs to someone enrolled in a health care training programme. It carries no licence and no practice of its own, so no address or phone number is published for it.

Fort Collins, CO

No coordinates on file. Search this address in Google Maps

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence DR.0058404 (CO)
Student in an Organized Health Care Education/Training Program Taxonomy 390200000X (IL)

Record details

NPI number1851737498
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedMay 21, 2013
Last updated in NPPESJuly 21, 2022

Medicare enrollment

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

Medicare specialtyEMERGENCY MEDICINE
Medical schoolOTHER
Graduated 2013 (13 years in practice)
Group practice Emergency Physicians Of The Rockies, Pc — 79 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 patients310
Services billed 488 a service is one billed item, such as a visit, a test or a procedure
Average patient age76

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. Those with a page here are linked.

Colleagues at Emergency Physicians of the Rockies, PC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 79 clinicians in the practice; 12 are shown here.

Other providers in Fort Collins