LARSON GREENFIELD RN
NPI 1366045577
Nurse Anesthetist, Certified Registered in Fort Collins, CO
About Larson Greenfield Rn NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
LARSON GREENFIELD RN (NPI 1366045577) is an individual nurse anesthetist, certified registered in Fort Collins, Colorado, licensed in Colorado (APN.0996947-CRNA) and active in the NPI registry since November 2020. He is enrolled in Medicare PECOS, maintains 2 additional practice locations, and is a graduate of Other (2020).
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Locations 2
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Larson Greenfield Rn 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.
Medicare Billing Reassignments
5Medicare enrollment records show Larson Greenfield reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Fort Collins, CO 80525
- Reassigned Medicare billing, Colorado enrollment
- 250 clinicians in this Medicare group
Fort Collins, CO 80525
- Reassigned Medicare billing, Colorado enrollment
- 67 clinicians in this Medicare group
Sterling, CO 80751
- Reassigned Medicare billing, Colorado enrollment
- 35 clinicians in this Medicare group
Holyoke, CO 80734
- Reassigned Medicare billing, Colorado enrollment
- Also billed through NPI 1073520375 (Colorado)
- 39 clinicians in this Medicare group
Lamar, CO 81052
- Reassigned Medicare billing, Colorado enrollment
- 115 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
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 80525 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
FORT COLLINS, CO 80525
FORT COLLINS, CO 80525
FORT COLLINS, CO 80525
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 Larson Greenfield's NPI number?
The NPI number for Larson Greenfield is 1366045577. It was assigned to this individual provider in the NPPES registry on November 19, 2020.
Where is Larson Greenfield located?
Larson Greenfield practices at 3702 Automation Way Ste 103, Fort Collins, CO 80525. The listed phone number is (970) 224-2985.
What is Larson Greenfield's specialty?
The primary specialty registered for this NPI is Nurse Anesthetist, Certified Registered with taxonomy code 367500000X.
Is Larson Greenfield enrolled in Medicare?
Yes. Larson Greenfield 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.
Which organizations bill Medicare for Larson Greenfield's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Larson Greenfield reassigns Medicare benefits to 5 organizations: Northern Colorado Anesthesia Professionals PLLC (Fort Collins, CO), Centers For Gastroenterology (Fort Collins, CO), Sterling Anesthesia Associates LLC (Sterling, CO), East Phillips County Hospital District (Holyoke, CO) and Prowers County Hospital District (Lamar, 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 Larson Greenfield's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Larson Greenfield accept?
Health plans from Blue Cross Blue Shield of Wyoming and Oscar Insurance Company list Larson Greenfield 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.
When was this NPI record last updated?
The NPPES record for Larson Greenfield was last updated on March 11, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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.
# Larson Greenfield, RN · NPI 1366045577
Nurse Anesthetist, Certified Registered physician in Fort Collins, Colorado. Individual provider, active in the CMS NPPES registry since November 19, 2020.
## Identity
- **NPI:** 1366045577 (Entity type: Individual)
- **Enumerated:** November 19, 2020
- **Primary specialty:** Nurse Anesthetist, Certified Registered · taxonomy 367500000X
- **State license:** APN.0996947-CRNA (Colorado)
- **Sole proprietor:** No
## Practice location
- **Address:** 3702 AUTOMATION WAY STE 103, Fort Collins, CO 80525-5738
- **Phone:** (970) 224-2985
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging
- **Bills Medicare through:** 5 organizations under Medicare reassignment (form CMS-855R): Northern Colorado Anesthesia Professionals PLLC (NPI 1851389613, Fort Collins, CO); Centers For Gastroenterology (NPI 1801994157, Fort Collins, CO); Sterling Anesthesia Associates LLC (NPI 1932978897, Sterling, CO); East Phillips County Hospital District (NPI 1891733879, Holyoke, CO); Prowers County Hospital District (NPI 1821052929, Lamar, CO) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2020
## Record status
- **NPPES last updated:** March 11, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1366045577) · Data from the CMS NPPES public registry.