Dr. Aaron Y. Lessen
Emergency Medicine (Emergency Medicine Physician)
501 E Hampden Ave
Englewood, CO 80113
Who else practices at this address →
Arapahoe County includes primary care (8% of residents) shortage areas. About shortage areas
- Medicare participating
At a glance
- Medical school
- University of Pittsburgh School of Medicine (2005)
- Years since graduation
- 21
- In the NPI registry since
- 2007
- Medicare patients seen, 2024
- 388
Licensed in Colorado since 2008, according to the Colorado Department of Regulatory Agencies. We show license dates only for the states that publish them in bulk; see which states do. For other states, check the state medical board.
The NPI date is when this clinician registered for a National Provider Identifier, the billing number used on health claims. It is not a license, graduation or board-certification date. NPIs were first issued in May 2005 and became required on claims in 2007–2008, so an early date usually means the clinician was already in practice before then. What an NPI is
Education and training
- 2005Medical school: University of Pittsburgh School of Medicine
- 2007Registered with an NPI (national billing number; not a license date) — NPIs began in 2005, so practice likely started earlier
Undergraduate school, residency, fellowship, licensing exams and board certification aren’t in public federal data. Board certification can be confirmed with the certifying board (ABMS member boards for MDs, AOA boards for DOs).
Specialties and state licenses
-
Emergency Medicine Physician primary
CO license DR.0046304 (first issued 2008; active) · AZ license 37825 · CO license 46304 (first issued 2008; active) · NM license MD2025-0938
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- Hca-Healthone DBA Swedish Medical Center Englewood, CO
- San Juan Regional Medical Center Inc Farmington, NM
- Gunnison Valley Hospital Gunnison, CO
Medical groups
- San Juan Regional Medical Center, Inc. (241 clinicians)
- Carepoint Emergency Medicine, PLLC (161 clinicians)
- Gunnison Valley Hospital (85 clinicians)
Hospitals this clinician lists with Medicare, and groups they bill Medicare through (Care Compare). Affiliation doesn’t mean they see patients at every location.
Medicare patients and services
- Medicare patients, 2024
- 388
- Services billed
- 679
- Patients’ average age
- 74
| Service | Times | Patients |
|---|---|---|
| Emergency department visit with high level of medical decision making | 277 | 265 |
| Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only | 241 | 218 |
| Emergency department visit with moderate level of medical decision making | 95 | 94 |
| Critical care, first 30-74 minutes | 55 | 54 |
| Emergency department visit with low level of medical decision making | 12 | 12 |
Medicare fee-for-service only. CMS leaves out services billed for fewer than 11 patients. These figures describe a practice’s Medicare work; they aren’t a measure of quality.
Medicare prescriptions
| Drug | Prescriptions |
|---|---|
| Ondansetron Odt (ondansetron) Other prescribers in Englewood, CO | 24 |
| Cyclobenzaprine Hcl Other prescribers in Englewood, CO | 18 |
| Oxycodone Hcl Other prescribers in Englewood, CO | 18 |
| Cefuroxime (cefuroxime axetil) Other prescribers in Englewood, CO | 17 |
| Cephalexin Other prescribers in Englewood, CO | 16 |
Prescriptions filled under Medicare Part D, including refills. CMS leaves out drugs prescribed fewer than 11 times.