Quick answers
- Does Cristina G. Rivera accept Medicare assignment?
- Yes. Medicare's clinician data says Cristina G. Rivera 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 Cristina G. Rivera see?
- In 2024, CMS data shows 86 Original Medicare patients and 412 services for Cristina G. Rivera. This counts Original Medicare only and measures volume, not quality.
- What is Cristina G. Rivera's NPI number?
- 1851929350. 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 Cristina G. Rivera, 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 | 86 |
|---|---|
| Services billed to Medicare | 412 |
| Different services or procedures | 40 |
| Participating Medicare provider | Yes |
| Average age of these patients | 72 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)137 services
- Blood glucose (sugar) test performed by hand-held instrument (82962)51 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)43 services
- New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)17 services
- Administration of influenza virus vaccine (G0008)17 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 pressure70%
- High cholesterol63%
- Diabetes41%
- Arthritis33%
- Chronic kidney disease31%
- Ischemic heart disease17%
Practice locations
Addresses where Cristina G. Rivera is enrolled with Medicare (CMS data updated October 2, 2026).
- 720 Pleasanton RdSan Antonio, TX 78214 (210) 921‑3800
Group practices
Medicare enrollment lists Cristina G. Rivera as a member of this group (CMS data updated October 2, 2026).
- GMG Health Systems Associates PA117 clinicians in the group
Specialties
- Family Practiceprimary
Other family doctors in San Antonio
Clinicians with the same Medicare primary specialty in San Antonio, TX — not a recommendation.
Other clinicians in GMG Health Systems Associates PA
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2011 (15 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1851929350 |
| 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