Quick answers
- Does Gillian M. Ruiz accept Medicare assignment?
- Yes. Medicare's clinician data says Gillian M. Ruiz accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Gillian M. Ruiz see?
- In 2024, CMS data shows 20 Original Medicare patients and 146 services for Gillian M. Ruiz. This counts Original Medicare only and measures volume, not quality.
- What is Gillian M. Ruiz's NPI number?
- 1598496622. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Gillian M. Ruiz, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 20 |
|---|---|
| Services billed to Medicare | 146 |
| Different services or procedures | 3 |
| Participating Medicare provider | Yes |
| Average age of these patients | 70 |
Most frequent services
- Therapy procedure reassessment for nutrition management, each 15 minutes (97803)66 services
- Therapy procedure for nutrition management, each 15 minutes (97802)56 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Diabetes75%
Practice locations
Addresses where Gillian M. Ruiz is enrolled with Medicare (CMS data updated October 2, 2026).
- 1846 E Innovation Park DrOro Valley, AZ 85755 (520) 477‑1650
Group practices
Medicare enrollment lists Gillian M. Ruiz as a member of this group (CMS data updated October 2, 2026).
- Duke Nutrition Experts LLC7 clinicians in the group
Specialties
Find other clinicians: Registered Dietitian or Nutrition Professional, Arizona →
Other dietitians in Oro Valley
Clinicians with the same Medicare primary specialty in Oro Valley, AZ — not a recommendation.
Other clinicians in Duke Nutrition Experts LLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Graduation year | 2021 |
|---|---|
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1598496622 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians