Aaron Yosef Lessen
Emergency Medicine Physician · Englewood, CO
Aaron Yosef Lessen is an emergency medicine physician with a practice address in Englewood, Colorado, and NPI 1457535346, issued on Dec 27, 2007. Check the license (Colorado DR.0046304, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Aaron Yosef Lessen
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License numbers
- DR.0046304 CO
46304 CO
37825 AZ
MD2025-0938 NM
Self-reported in NPPES; status is on the state search - Practice location
- 501 E Hampden Ave, Englewood, CO 80113
- Phone
- (303) 788-6911
- Enumerated
- Dec 27, 2007
- Record last updated
- Nov 24, 2025
- Fax
- (303) 306-7753
- Medicaid ID
- 97485870 CO
- Medicare enrollment
- Enrolled (PECOS I20080730000334); accepts Medicare assignment
- Medical or professional school
- University Of Pittsburgh School Of Medicine, 2005
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 1,434 in Colorado → Look up another NPI →
Also registered at 501 E Hampden Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Simeon Abramson, MDDiagnostic Radiology Physician1730129859
- Juan Acosta, MDInternal Medicine Physician1316919350
- Diane Ampe, NNPNeonatal Nurse Practitioner1437113818
- Kristin AndersonHospitalist Physician1265744262
- Rebekah Ashcraft, RNRegistered Nurse1700622479
- Timbre Backen, DOStudent in an Organized Health Care Education/Training Program1811524150
Verify Aaron Yosef Lessen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license DR.0046304Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
22% fewer Medicare Part D claims than the average emergency medicine physician in 2024
176 Medicare Part D claims for 133 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 18 claims were for opioids.
Most prescribed
- Ondansetron Odt24 claims
- Cyclobenzaprine Hcl18 claims
- Oxycodone Hcl18 claims
- Cefuroxime17 claims
- Cephalexin16 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $110.78
1 payment: food and beverage; the largest payer was Ceribell, Inc. The 12,335 providers of this specialty with any payment received $953.79 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
3 hospitals and group practices
- Carepoint Emergency Medicine, PLLCEnglewood, CO
- Gunnison Valley HospitalGunnison, CO · Critical Access Hospitals
- San Juan Regional Medical Center, Inc.Farmington, NM
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov).
Aaron Yosef Lessen among 1,434 emergency medicine physician records in Colorado
Aaron Yosef Lessen is one of 1,434 emergency medicine physician records with a practice address in Colorado. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 43% of them.
- NPI issued2007 · 43% of these records are older, 47% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 57% of these records are
- Graduated2005 · median 2011 among the 810 with a school on file
- Record last updated2025 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
38 emergency medicine physician records list a practice address in Englewood
They are 38 of the 2,840 NPPES records with a practice address in Englewood, and 1,434 emergency medicine physician records in Colorado.
All 1,434 in Colorado → Every provider in Englewood → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Peter BakesEnglewood, CO 801131467435172
- Gregory BurchamEnglewood, CO 801131942283569
- Suzanne ChiltonEnglewood, CO 801131891778429
- Gretchen HinsonEnglewood, CO 801131962467357
- Christopher HolmesEnglewood, CO 801131336127679
- Delwin HuntEnglewood, CO 801131366428880
- Samuel KillianEnglewood, CO 801131447238365
- Mark KozlowskiEnglewood, CO 801131285610683
Common questions
What is Aaron Yosef Lessen's NPI number?
Aaron Yosef Lessen's National Provider Identifier (NPI) is 1457535346, issued on Dec 27, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Aaron Yosef Lessen located?
The NPPES record lists a practice address at 501 E Hampden Ave, Englewood, CO, 80113. Phone: (303) 788-6911. Providers update this record themselves, so call before visiting.
How can I verify Aaron Yosef Lessen's license?
NPPES lists Colorado license number DR.0046304, as entered by the provider. Search the Colorado Medical Board at https://dpo.colorado.gov/Medical. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Aaron Yosef Lessen prescribe under Medicare Part D?
In 2024, Aaron Yosef Lessen had 176 Medicare Part D claims for 133 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.