Aaron Yosef Lessen
- Medicare services, 2024
- 614
- Medicare patients, 2024
- 388
- Part D claims, 2024
- 176
- Hospital affiliations
- 3
- Industry payments
- $139
- Practice address
- 501 E Hampden Ave, Englewood, CO 80113
- Practice phone
- Call (303) 788-5000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Aaron Lessen's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Aaron Yosef Lessen is an emergency medicine physician in Englewood, Colorado
Aaron Lessen practices at HCA HealthONE Swedish in Englewood, Colorado, part of HCA Healthcare.
Aaron Lessen's NPI, 1457535346, was assigned on December 27, 2007. Aaron Lessen graduated from University of Pittsburgh School of Medicine in 2005. Aaron Lessen holds Colorado license DR.0046304.
- NPI
- 1457535346NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1254405921
- NPI enumeration date
- December 27, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (303) 788-5000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 47
- Medical school graduation
- 2005
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Aaron Yosef Lessen practices at HCA HealthONE Swedish in Englewood, Colorado
Aaron Lessen's primary practice is HCA HealthONE Swedish, at 501 E Hampden Ave, Englewood, CO 80113 in Arapahoe County. The practice phone is (303) 788-5000.
- HCA HealthONE Swedish501 E Hampden Ave, Englewood, CO 80113 · Arapahoe CountyPhone(303) 788-5000
Source: Dmand AI Affiliation Data
Aaron Yosef Lessen is affiliated with 4 sites of care and 4 medical groups
Aaron Lessen's primary practice is HCA HealthONE Swedish in Englewood, Colorado, part of HCA Healthcare. Aaron Lessen is also affiliated with San Juan Regional Medical Center. The medical group on file is CarePoint. Dmand AI also links Aaron Lessen to 1 more hospital, 3 medical groups and 1 group practice or clinic, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Aaron Yosef Lessen's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Aaron Lessen practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| HCA HealthONE Swedish | Available with a free account |
| +3 more sites and 3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Aaron Yosef Lessen is one of 1,226 emergency medicine physicians in Colorado
Emergency medicine is Aaron Lessen's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dmand AI has Aaron Lessen's licenses on file in 2 states: Colorado and Arizona.
Specialties and state licenses
- Emergency medicine, ColoradoPrimary
- Arizona license
Emergency medicine physicians near Aaron Lessen
Counts of emergency medicine physicians with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Aaron Yosef Lessen billed Medicare for 614 services in 2024
CMS data shows 614 Medicare services from Aaron Lessen across 4 procedure codes in 2024, for 388 Medicare patients. Medicare paid $51,437 for them. Every service was in a facility, such as a hospital, rather than an office.
Aaron Lessen's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 4392024: 39610%
- Tests and treatments
- 2023: 2412024: 21810%
Aaron Lessen compared with the Colorado median for emergency medicine physicians, 2024
- Aaron Lessen
- Colorado median
- Medicare services
- 614vs 1993.1 times
- Medicare patients
- 388vs 1932.0 times
- Part D claims
- 93vs 342.7 times
Medians across 1,237 emergency medicine physicians in Colorado with Dmand AI profiles that report each measure.
Aaron Lessen's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Aaron Yosef Lessen treated 388 Medicare patients in 2024, average age 74
CMS counts 388 Medicare patients who saw Aaron Lessen in 2024. The largest group is 65 to 74, with 138 patients. 75% of them have high blood pressure, and 73% have high cholesterol. 25% are also on Medicaid. Their average risk score is 1.95, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Aaron Lessen's median patient age at 52, with 55% women.
Aaron Lessen's Medicare patients by age, 2024
Aaron Lessen's Medicare patients by sex, 2024
- Women22558%
- Men16342%
Chronic conditions among Aaron Lessen's Medicare patients, 2024
- High blood pressure75%
- High cholesterol73%
- Arthritis51%
- Mood disorders42%
- Depression37%
- Chronic kidney disease35%
- Ischemic heart disease35%
- Anxiety33%
Share of Medicare patients with each condition. A patient can have several.
Aaron Lessen's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 52
Patient panel by sex, all payers
- Women55%
- Men45%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Aaron Yosef Lessen wrote 176 Medicare Part D claims in 2024
In 2024, Aaron Lessen wrote 176 Medicare Part D claims for 133 patients. 97% of them were for generic drugs. CMS names the drug for 93 of them, across 5 drugs with 11 or more claims each, at $649 in total drug cost. In 2023, CMS named 74 claims across 4 drugs.
Aaron Lessen's Part D claims by kind of drug, 2024
- Generic171 claims97%
- Brand-name and other5 claims3%
Aaron Lessen's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Aaron Lessen's Part D claims, 2024
- Opioids10%18 of 176 claims
- Antibiotics30%52 of 176 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 742024: 9326%
Drugs named by CMS: 5 in 2024, 4 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Aaron Yosef Lessen takes part in Medicare
Aaron Lessen accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Aaron Yosef Lessen received $139 in industry payments from 2016 to 2024
CMS Open Payments shows 2 general payments to Aaron Lessen from 2 drug and device companies from 2016 to 2024. Food and beverage make up the largest share, 100% of the total. Ceribell, Inc. paid the most, $111.
General payments to Aaron Lessen by program year, 2016 to 2024
Companies that paid Aaron Lessen the most, 2016 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Aaron Yosef Lessen graduated from University of Pittsburgh School of Medicine
Aaron Lessen graduated from University of Pittsburgh School of Medicine in 2005.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Aaron Yosef Lessen's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Aaron Yosef Lessen
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Aaron Yosef Lessen's NPI number?
Aaron Yosef Lessen's NPI number is 1457535346. It was assigned on December 27, 2007, and it is active in the NPI Registry.
What does Aaron Yosef Lessen specialize in?
Aaron Yosef Lessen is an emergency medicine physician in Englewood, Colorado. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Aaron Yosef Lessen practice?
Aaron Lessen practices at 501 E Hampden Ave, Englewood, CO 80113. Aaron Lessen's primary practice is HCA HealthONE Swedish in Englewood, Colorado, part of HCA Healthcare. Dmand AI also links Aaron Lessen to 1 hospital, 3 medical groups and 1 group practice or clinic.
What is Aaron Yosef Lessen's office phone number?
The practice phone on file for Aaron Lessen is (303) 788-5000.
What is Aaron Yosef Lessen's medical license number?
Aaron Lessen holds Colorado license DR.0046304, one of the licenses on file in 2 states.
Which states has Aaron Yosef Lessen been licensed in?
Dmand AI has state licenses on file for Aaron Lessen in Colorado and Arizona.
Which hospitals is Aaron Yosef Lessen affiliated with?
Aaron Lessen practices at HCA HealthONE Swedish in Englewood, Colorado. Aaron Lessen is also affiliated with San Juan Regional Medical Center. Dmand AI links Aaron Lessen to 1 more hospital.
What medical group is Aaron Yosef Lessen part of?
Aaron Lessen is linked to CarePoint. Dmand AI links Aaron Lessen to 3 more medical groups.
Does Aaron Yosef Lessen accept Medicare?
Yes. CMS data shows Aaron Lessen billed Medicare for 614 services in 2024, and Aaron Lessen accepts Medicare assignment.
How many Medicare patients does Aaron Yosef Lessen see?
CMS counts 388 Medicare patients who saw Aaron Lessen in 2024, with an average age of 74.
Show 5 more questionsShow fewer questions
What services does Aaron Yosef Lessen bill to Medicare?
In 2024, Aaron Lessen's most billed Medicare services were emergency department visit (99285), heart test or procedure (93010) and critical care (99291).
Where did Aaron Yosef Lessen go to medical school?
Aaron Lessen graduated from University of Pittsburgh School of Medicine in 2005.
What drugs does Aaron Yosef Lessen prescribe most?
In 2024 Medicare Part D data, Aaron Lessen's most prescribed drugs by claims were Ondansetron ODT, Cyclobenzaprine HCl and Oxycodone HCl.
Has Aaron Yosef Lessen received payments from drug or device companies?
CMS Open Payments shows $139 in general payments to Aaron Lessen from 2 companies from 2016 to 2024. The largest total came from Ceribell, Inc.
How long has Aaron Yosef Lessen been practicing?
Aaron Lessen graduated from medical school in 2005, 21 years ago.
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