Dr. Peter J. Lennarson, MD
Neurosurgery (Neurological Surgery Physician)
12605 E 16th Ave
Aurora, CO 80045
Who else practices at this address →
Adams County includes primary care (2% of residents) shortage areas. About shortage areas
- Medicare participating
At a glance
- Medical school
- University of Wisconsin School of Medicine (1995)
- Years since graduation
- 31
- In the NPI registry since
- 2006
- Medicare patients seen, 2024
- 179
Licensed in Colorado since 2013, 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
- 1995Medical school: University of Wisconsin School of Medicine
- 2006Registered 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
-
Neurological Surgery Physician primary
CO license 52461 (first issued 2013; active) · NE license 23280
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- University of Colorado Hospital Authority Aurora, CO
- Longs Peak Hospital Longmont, CO
Medical groups
- University Physicians Incorporated (3,215 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
- 179
- Services billed
- 463
- Patients’ average age
- 71
| Service | Times | Patients |
|---|---|---|
| Fusion of additional segment of spine | 57 | 13 |
| New patient office or other outpatient visit, 45-59 minutes | 41 | 41 |
| Insertion of cage or mesh device to spine bone and disc space during spine fusion | 32 | 19 |
| New patient office or other outpatient visit, 60-74 minutes | 25 | 25 |
| Computer-assisted spinal procedure | 18 | 17 |
| Established patient office or other outpatient visit, 40-54 minutes | 17 | 17 |
| Fusion of spine in lower back with partial removal of spine bone and disc | 15 | 15 |
| Established patient office or other outpatient visit, 30-39 minutes | 14 | 14 |
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.
Payments from drug and device companies
In 2025, 2 companies reported 2 payments worth $41.71 in total to this clinician.
| Solventum Corporation | $22.37 |
|---|---|
| Medtronic, Inc. | $19.34 |
| Food and Beverage | $41.71 |
|---|
From CMS Open Payments. A payment is not evidence of wrongdoing; many are for consulting, teaching or meals. Clinicians can review and dispute their records with CMS.