ALEXANDER JOSEPH NEILSON DO
NPI 1316506728
Anesthesiology in Golden, CO
About Alexander Joseph Neilson Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ALEXANDER JOSEPH NEILSON DO (NPI 1316506728) is an individual anesthesiology provider in Golden, Colorado, licensed in Colorado (DR.0077350) and active in the NPI registry since June 2019. He is enrolled in Medicare PECOS, is affiliated with Adventist Healthcare White Oak Medical Center, and is a graduate of Campbell Univ School Of Osteopathic Medicine (2019).
NPPES Registry Identity
Specialties & Licenses
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
Alexander Joseph Neilson Do 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
2Medicare enrollment records show Alexander Neilson reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Golden, CO 80401
- Reassigned Medicare billing, Colorado enrollment
- 171 clinicians in this Medicare group
Columbia, MD 21046
- Reassigned Medicare billing, District of Columbia and Maryland enrollments
- 717 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 2
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.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Adventist Healthcare White Oak Medical Center
Acute Care Hospitals · Silver Spring, MDAdventist Healthcare Shady Grove Medical Center
Acute Care Hospitals · Rockville, MDOther Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Alexander Neilson's NPI number?
The NPI number for Alexander Neilson is 1316506728. It was assigned to this individual provider in the NPPES registry on June 10, 2019.
Where is Alexander Neilson located?
Alexander Neilson practices at 12911 W 40th Ave, Golden, CO 80401. The listed phone number is (303) 425-4500.
What is Alexander Neilson's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is Alexander Neilson enrolled in Medicare?
Yes. Alexander Neilson 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 Alexander Neilson's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Alexander Neilson reassigns Medicare benefits to 2 organizations: Physician Anesthesia Services PC (Golden, CO) and First Colonies Anesthesia Associates, LLC (Columbia, MD). 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 Alexander Neilson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Alexander Neilson affiliated with any hospitals?
According to CMS data, Alexander Neilson is affiliated with Adventist Healthcare White Oak Medical Center and Adventist Healthcare Shady Grove Medical Center.
When was this NPI record last updated?
The NPPES record for Alexander Neilson was last updated on October 14, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 days 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.
# Alexander Joseph Neilson, DO · NPI 1316506728
Anesthesiology physician in Golden, Colorado. Individual provider, active in the CMS NPPES registry since June 10, 2019.
## Identity
- **NPI:** 1316506728 (Entity type: Individual)
- **Enumerated:** June 10, 2019
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** DR.0077350 (Colorado)
- **Sole proprietor:** No
## Practice location
- **Address:** 12911 W 40TH AVE, Golden, CO 80401-2696
- **Phone:** (303) 425-4500
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Physician Anesthesia Services PC (NPI 1861476590, Golden, CO); First Colonies Anesthesia Associates, LLC (NPI 1740218767, Columbia, MD) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Campbell Univ School Of Osteopathic Medicine, class of 2019
## Record status
- **NPPES last updated:** October 14, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1316506728) · Data from the CMS NPPES public registry.