Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Alexander Joseph Neilson, DO

Individual provider Anesthesiology Physician · NPI 1316506728

Alexander Joseph Neilson, DO practises Anesthesiology in Golden, Colorado. Graduated from Campbell Univ School of Osteopathic Medicine in 2019, 7 years ago. Practices with First Colonies Anesthesia Associates, LLC, a 340-clinician group and accepts Medicare assignment. Licensed in Colorado.

Years since qualifying
7
Trained at
Campbell Univ School of Osteopathic Medicine
Licensed in
CO
In the registry since
2019
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

12911 W 40th Ave
Golden, CO 80401-2696
Phone: (303) 425-4500
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Anesthesiology Physician (primary) Taxonomy 207L00000X · Licence DR.0077350 (CO)

Record details

NPI number1316506728
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedJune 10, 2019
Last updated in NPPESOctober 14, 2026
Certification dateOctober 14, 2026

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyANESTHESIOLOGY
Medical schoolCAMPBELL UNIV SCHOOL OF OSTEOPATHIC MEDICINE
Graduated 2019 (7 years in practice)
Group practice First Colonies Anesthesia Associates, Llc — 340 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients81
Services billed 140 a service is one billed item, such as a visit, a test or a procedure
Average patient age76

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Compensation for services other than consulting , including serving as faculty or as a speaker at a venue other than a continuing education program $34 1 payment

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

  • Adventist Healthcare Shady Grove Medical Center Hospital · Rockville, MD
  • Adventist Healthcare White Oak Medical Center Hospital · Silver Spring, MD

Colleagues at First Colonies Anesthesia Associates, LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 340 clinicians in the practice; 12 are shown here.

Other providers in Golden