LESLIE LEANNE ARMSTRONG
NPI 1578730958
Emergency Medicine in Longmont, CO
About Leslie Leanne Armstrong NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
LESLIE LEANNE ARMSTRONG (NPI 1578730958) is an individual emergency medicine provider in Longmont, Colorado, licensed in Colorado (49936) and active in the NPI registry since May 2008. She is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses 2
Other Names 1
Other Identifiers 3
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Leslie Leanne Armstrong is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
4Medicare enrollment records show Leslie Armstrong reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Longmont, CO 80501
- Reassigned Medicare billing, Colorado enrollment
- 468 clinicians in this Medicare group
Longmont, CO 80504
- Reassigned Medicare billing, Colorado enrollment
- 118 clinicians in this Medicare group
Dacono, CO 80514
- Reassigned Medicare billing, Colorado enrollment
- 352 clinicians in this Medicare group
Westminster, CO 80021
- Reassigned Medicare billing, Colorado enrollment
- 130 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 80501 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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.
LONGMONT, CO 80501
LONGMONT, CO 80501
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 Leslie Armstrong's NPI number?
The NPI number for Leslie Armstrong is 1578730958. It was assigned to this individual provider in the NPPES registry on May 14, 2008. The provider is also known as Leslie Armstrong M.D..
Where is Leslie Armstrong located?
Leslie Armstrong practices at 1950 Mountain View Ave, Longmont, CO 80501. The listed phone number is (303) 306-7783.
What is Leslie Armstrong's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Leslie Armstrong enrolled in Medicare?
Yes. Leslie Armstrong is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Leslie Armstrong's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Leslie Armstrong reassigns Medicare benefits to 4 organizations: Usacs Of Colorado Inc (Longmont, CO), Emergency Physicians Of The Rockies, PC (Longmont, CO), Usacs Community Emergency Services Of Colorado, Inc. (Dacono, CO) and Premier Emergency Services, Inc (Westminster, CO). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Leslie Armstrong's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Leslie Armstrong was last updated on February 28, 2014. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 years 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.
# Leslie Leanne Armstrong · NPI 1578730958
Emergency Medicine physician in Longmont, Colorado. Individual provider, active in the CMS NPPES registry since May 14, 2008.
## Identity
- **NPI:** 1578730958 (Entity type: Individual)
- **Enumerated:** May 14, 2008
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 49936 (Colorado)
- **Sole proprietor:** No
## Practice location
- **Address:** 1950 MOUNTAIN VIEW AVE, Longmont, CO 80501-3129
- **Phone:** (303) 306-7783 · **Fax:** (303) 306-7753
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 4 organizations under Medicare reassignment (form CMS-855R): Usacs Of Colorado Inc (NPI 1558997395, Longmont, CO); Emergency Physicians Of The Rockies, PC (NPI 1285133819, Longmont, CO); Usacs Community Emergency Services Of Colorado, Inc. (NPI 1548895030, Dacono, CO); Premier Emergency Services, Inc (NPI 1962037440, Westminster, CO) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** February 28, 2014
- **Other identifiers:** Other P00943877 (CO); Medicare PIN COA106140 (CO); Medicaid 72925361 (CO)
---
Source: [NPI Profile](https://npiprofile.com/npi/1578730958) · Data from the CMS NPPES public registry.