Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Nicolas Alfonso Villa Guillen, MD

Individual provider Gastroenterology Physician · NPI 1265696553

Dr. Nicolas Alfonso Villa Guillen, MD practises Gastroenterology in Spokane, Washington. Qualified in 2006, 20 years ago. Practices with Pioneer Gi Clinic, APC, a 6-clinician group and accepts Medicare assignment. Licensed in Texas and Washington.

Years since qualifying
20
Licensed in
TX, WA
In the registry since
2008
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

910 W 5th Ave Ste 501
Spokane, WA 99204-2967
Phone: (509) 838-2531
Fax: (509) 755-6580
Show map & directions

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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Gastroenterology Physician (primary) Taxonomy 207RG0100X · Licence MD60501812 (WA)
Internal Medicine Physician Taxonomy 207R00000X · Licence BP10031201 (TX)

Record details

NPI number1265696553
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 15, 2008
Last updated in NPPESSeptember 28, 2021
Certification dateSeptember 28, 2021

Medicare enrollment

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

Medicare specialtyGASTROENTEROLOGY
Medical schoolOTHER
Graduated 2006 (20 years in practice)
Group practice Pioneer Gi Clinic, Apc — 6 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations4 on file with Medicare

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Upper gastrointestinal (GI) endoscopy for acid reflux 543 times · 99th percentile
Colonoscopy 162 times · 90th percentile

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

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 patients687
Services billed 1,236 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

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.

Food and Beverage $4,338 34 payments · a meal or drink at a meeting or visit, not a fee

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. Those with a page here are linked.

  • Providence Alaska Medical Center Hospital · Anchorage, AK · listed as Alaska Native Medical Center
  • Yakima Valley Memorial Hospital · Yakima, WA · listed as Yakima Valley Memorial Hospital
  • Alaska Regional Hospital Hospital · Anchorage, AK
  • Deaconess Medical Center Hospital · Spokane, WA
  • Multicare Valley Hospital Hospital · Spokane Valley, WA

Colleagues at Pioneer Gi Clinic, APC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 6 clinicians in the practice; 4 are shown here.

Other providers in Spokane