Doctor profile · Federal record
Dr. Aaron Lessen
Emergency Medicine Physician (CMS: Emergency Medicine) · Emergency Medicine Physician · Emergency Medicine Physician · Emergency Medicine Physician · Englewood, CO
- NPI 1457535346
- Accepts Medicare
- 21 yrs in practice
- Licensed in 3 states
- Male
- Group practice
- No sanctions
Practice & contact
Operates at 2 locations .
- Primary practice
-
501 E Hampden Ave
Englewood, CO 801132702
(303) 788-6911
fax (303) 306-7753 - Additional location
-
801 W Maple St
Farmington, NM 874015630
(505) 609-2000 - Mailing address
-
Po Box 173862
Denver, CO 802173862
Credentials & registration
- NPI registered
- December 2007 — 19 yrs on file
- Profile last updated
- November 24, 2025
- Year of graduation
- 2005 — 21 yrs since
- Specialty taxonomy
- 207P00000X — NUCC code
- State licenses (4)
- Colorado #DR.0046304 · Colorado #46304 · New Mexico #MD2025-0938 · Arizona #37825
- Medicaid
- CO #97485870
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1457535346. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
680
Distinct HCPCS
5
Medicare allowed
$73,579
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99285 |
Emergency department visit with high level of medical decision making | 277 | 265 | $173 | |
93010 |
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only | 241 | 218 | $8 | |
99284 |
Emergency department visit with moderate level of medical decision making | 95 | 94 | $119 | |
99291 |
Critical care, first 30-74 minutes | 55 | 54 | $211 | |
99283 |
Emergency department visit with low level of medical decision making | 12 | 12 | $71 |
In context: peer comparison
Among 15 peers in Englewood Emergency Medicine Physician, average services per provider: 77. This provider delivers 8.8× the peer median.Open Payments
Industry payments received
All-time total
$111
Transactions
1
Manufacturers
1
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Ceribell, INC. | 1 | $110.78 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
74
Patients
72
Total drug cost
$725
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Ondansetron Odt (Ondansetron) | Brand | 28 | 27 | $165 |
| Cefuroxime (Cefuroxime Axetil) | Brand | 23 | 22 | $398 |
| Cephalexin | Generic | 12 | 12 | $123 |
| Prednisone | Generic | 11 | 11 | $39 |
Frequently asked questions
What is Dr. Aaron Lessen's medical specialty?
Dr. Aaron Lessen practices Emergency Medicine Physician in Englewood, CO.
Where does Dr. Aaron Lessen practice?
Dr. Aaron Lessen practices at 501 E Hampden Ave, Englewood, CO 801132702. Office phone: 3037886911.
What is Dr. Aaron Lessen's NPI?
Dr. Aaron Lessen's National Provider Identifier (NPI) is 1457535346, issued by NPPES.
Does Dr. Aaron Lessen accept Medicare assignment?
Yes. Dr. Aaron Lessen accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Aaron Lessen commonly perform?
Top Medicare-reported procedures in 2023: Emergency department visit with high level of medical decision making (HCPCS 99285); Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (HCPCS 93010); Emergency department visit with moderate level of medical decision making (HCPCS 99284). Source: CMS Medicare Physician & Other Practitioners file.