Quick answers
- Does G Thomas Ruiz accept Medicare assignment?
- Yes. Medicare's clinician data says G Thomas 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 G Thomas Ruiz see?
- In 2024, CMS data shows 19 Original Medicare patients and 32 services for G Thomas Ruiz. This counts Original Medicare only and measures volume, not quality.
- What is G Thomas Ruiz's NPI number?
- 1518967330. 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 G Thomas 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 | 19 |
|---|---|
| Services billed to Medicare | 32 |
| Different services or procedures | 11 |
| Participating Medicare provider | Yes |
| Average age of these patients | 71 |
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%
- Arthritis74%
Practice locations
Addresses where G Thomas Ruiz is enrolled with Medicare (CMS data updated October 2, 2026).
- 16333 Harbor BlvdFountain Valley, CA 92708 (714) 549‑1300
- 18111 Brookhurst St, Suite 6100Fountain Valley, CA 92708 (714) 378‑7330
- 722 Baker StCosta Mesa, CA 92626 (714) 557‑6300
Group practices
Medicare enrollment lists G Thomas Ruiz as a member of this group (CMS data updated October 2, 2026).
- Memorialcare Medical Foundation566 clinicians in the group
Specialties
- Obstetrics/Gynecologyprimary
Other OB-GYNs in Fountain Valley
Clinicians with the same Medicare primary specialty in Fountain Valley, CA — not a recommendation.
Other clinicians in Memorialcare Medical Foundation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of California, Irvine, California College Of Medicine |
| Graduation year | 1989 (37 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1518967330 |
| 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