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AARON YOSEF LESSEN
NPI 1457535346
Emergency Medicine in Englewood, CO

Active since December 27, 2007PECOS EnrolledAccepts Medicare Assignment
501 E HAMPDEN AVE, ENGLEWOOD, CO 80113(303) 788-6911(303) 306-7753 Get Directions Write a Review

NPPES record last updated: November 24, 2025. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Aaron Yosef Lessen NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

AARON YOSEF LESSEN (NPI 1457535346) is an individual emergency medicine provider in Englewood, Colorado, licensed in Colorado (DR.0046304) and active in the NPI registry since December 2007. He is enrolled in Medicare PECOS, is affiliated with San Juan Regional Medical Center Inc, and maintains a secondary practice location in Farmington.

NPPES Registry Identity

NPI1457535346
Entity TypeIndividualMale
Primary Taxonomy207P00000X
Provider Legal NameAARON YOSEF LESSEN
Location Address501 E HAMPDEN AVEEnglewood, CO 80113-2702
Mailing AddressPo Box 173862Denver, CO 80217-3862 · (303) 306-7783 · Fax (303) 306-7753
Phone(303) 788-6911
Fax(303) 306-7753
Sole ProprietorNo
Medical School CMSUniversity Of Pittsburgh School Of MedicineGraduated 2005
Enumeration DateDecember 27, 2007
Last NPPES UpdateNovember 24, 2025
NPPES CertifiedNovember 24, 2025
✔ NPI 1457535346 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207P00000X
Licenses✔ Licensed in CO · DR.0046304✔ Licensed in CO · 46304✔ Licensed in NM · MD2025-0938✔ Licensed in AZ · 37825
Definition
An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.
501 E HAMPDEN AVE, Englewood, CO 80113
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Other Names 1

Professional Name (2)Aaron Y. Lessen Md

Secondary Practice Location 1

Location 1801 W Maple StFarmington, NM 87401-5630 · Phone (505) 609-2000

Other Identifiers 2

Medicaid97485870CO
OtherP00637700CO · Railroad Medicare

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Oscar Insurance Company.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Aaron Yosef Lessen is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID1254405921
PECOS Enrollment IDI20080730000334, I20260102001357
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 4

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Emergency department visit with high level of medical decision making 99285
An emergency department visit for severe conditions is when you urgently seek medical help due to serious health issues. These could be severe injuries, breathing problems, unbearable pain, or sudden severe illness. Doctors and nurses will provide immediate care to stabilize your condition.
291 services283 patients
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only 93010
A routine electrocardiogram (ECG) with 12 leads is a simple, non-invasive test that records the electrical activity of your heart. It helps in identifying heart conditions by detecting irregularities in your heart rhythms. The results are interpreted and a report is provided.
218 services203 patients
Critical care, first 30-74 minutes 99291
Critical care involves immediate and constant attention by a team of specially-trained health professionals. It's for patients with life-threatening conditions, requiring first 30-74 minutes of intense monitoring and treatment.
59 services59 patients
Emergency department visit with moderate level of medical decision making 99284
An emergency department visit for a high-severity issue means you're experiencing a serious health problem that needs immediate attention. This could be a severe injury, serious illness, or life-threatening condition. Medical professionals will provide urgent care to stabilize your condition.
46 services46 patients

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

San Juan Regional Medical Center Inc

Acute Care Hospitals · Farmington, NM
2/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number320005
Location801 West Maple StreetFarmington, NM 87401 · San Juan County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 80113 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$89.43 typical visit price
range $58.06 – $174.82
Typical copayment $22.35 (range $14.51 – $43.70)
Most-billed visit code 99203
Established Patient
$102.03 typical visit price
range $18.88 – $142.79
Typical copayment $25.50 (range $4.72 – $35.69)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

KEVIN K JOHNSON MD
Radiology (Diagnostic Radiology)
501 E HAMPDEN AVE
ENGLEWOOD, CO 80113
Arapahoe County (303) 761-9190
MS. JANET RUTH DUBRICK NNP
Nurse Practitioner (Neonatal)
501 E HAMPDEN AVE, S 5556
ENGLEWOOD, CO 80113
Arapahoe County (303) 788-6515
ALIDA RAE NEAR M.D.
Anesthesiology
501 E HAMPDEN AVE
ENGLEWOOD, CO 80113
Arapahoe County (303) 788-6749
CHERYL A. MELICK MD
General Practice
501 E HAMPDEN AVE
ENGLEWOOD, CO 80113
Arapahoe County (303) 788-6911
DR. DENETTA SUE SLONE MD
Surgery
501 E HAMPDEN AVE
ENGLEWOOD, CO 80113
Arapahoe County (303) 788-5300
CLAIRE SAKAMOTO PA
Physician Assistant
501 E HAMPDEN AVE
ENGLEWOOD, CO 80113
Arapahoe County (303) 788-6911
HEALTHONE CLINIC SERVICES - SURGERY NEUROLOGICAL LLC
Neurological Surgery
501 E HAMPDEN AVE
ENGLEWOOD, CO 80113
Arapahoe County (303) 788-5000
DR. WILLIAM DUNFEE M.D.
Radiology (Diagnostic Radiology)
501 E HAMPDEN AVE
ENGLEWOOD, CO 80113
Arapahoe County (303) 761-9190

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Aaron Lessen's NPI number?

The NPI number for Aaron Lessen is 1457535346. It was assigned to this individual provider in the NPPES registry on December 27, 2007. The provider is also known as Aaron Y. Lessen MD.

Where is Aaron Lessen located?

Aaron Lessen practices at 501 E Hampden Ave, Englewood, CO 80113. The listed phone number is (303) 788-6911.

What is Aaron Lessen's specialty?

The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.

Is Aaron Lessen enrolled in Medicare?

Yes. Aaron Lessen is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

What insurance does Aaron Lessen accept?

Health plans from Oscar Insurance Company list Aaron Lessen as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Aaron Lessen affiliated with any hospitals?

According to CMS data, Aaron Lessen is affiliated with San Juan Regional Medical Center Inc.

When was this NPI record last updated?

The NPPES record for Aaron Lessen was last updated on November 24, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.