Medical emergency?Emergency? Call 911. Nearest emergency roomsNearest ERs

Emergency Medicine

Cesar A. Aristeiguieta, MD

Works at hospitals in Sonora, CA · Houston, TX · Harlingen, TX · California, Texas

Summary

Dr. Cesar A. Aristeiguieta, MD is an emergency medicine doctor at 1000 Greenley Rd, Sonora, CA 95370. Phone: (209) 536-5000. Accepts Medicare assignment. In 2024, Cesar A. Aristeiguieta had 86 Original Medicare patients and 125 services. NPI 1255386256. Source: CMS National Downloadable File, updated October 2, 2026; CMS Facility Affiliation Data, updated October 2, 2026; CMS Medicare Physician & Other Practitioners, data year 2024.

From official Medicare data

This page shows what Medicare's official clinician data says about Cesar A. Aristeiguieta, joined by NPI number (data updated October 2, 2026). It is not a recommendation or a rating. Call the office or hospital to confirm before you go.

In a medical emergency, call 911.

Quick answers

Does Cesar A. Aristeiguieta accept Medicare assignment?
Yes. Medicare's clinician data says Cesar A. Aristeiguieta 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 Cesar A. Aristeiguieta see?
In 2024, CMS data shows 86 Original Medicare patients and 125 services for Cesar A. Aristeiguieta. This counts Original Medicare only and measures volume, not quality.
What is Cesar A. Aristeiguieta's NPI number?
1255386256. 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 Cesar A. Aristeiguieta, 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 patients86
Services billed to Medicare125
Different services or procedures11
Participating Medicare providerYes
Average age of these patients76

Most frequent services

  1. Emergency department visit with high level of medical decision making (99285)41 services
  2. Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)30 services
  3. Emergency department visit with moderate level of medical decision making (99284)28 services
  4. Critical care, first 30-74 minutes (99291)13 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 cholesterol65%
  • Arthritis52%
  • Ischemic heart disease37%
  • COPD36%
  • Diabetes33%

Hospitals where Cesar A. Aristeiguieta works

Medicare's Facility Affiliation Data lists Cesar A. Aristeiguieta at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.

Practice locations

Addresses where Cesar A. Aristeiguieta is enrolled with Medicare (CMS data updated October 2, 2026).

Group practices

Medicare enrollment lists Cesar A. Aristeiguieta as a member of these groups (CMS data updated October 2, 2026).

  • Round Table Physicians Group PLLC80 clinicians in the group
  • Arroyo Emergency Medicine Services, PA49 clinicians in the group
  • Sierra Emergency Medical Group Inc23 clinicians in the group

Specialties

Find other Emergency Medicine doctors in California →

Other emergency medicine doctors in Sonora

Clinicians with the same Medicare primary specialty in Sonora, CA — not a recommendation.

All emergency medicine doctors in Sonora →

Other clinicians in Round Table Physicians Group PLLC

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

Clinician information

CredentialMD
Medical schoolUniversity Of Southern California Keck School Of Medicine
Graduation year1998 (28 years since medical school)
Gender (as listed)Male
Medicare assignmentAccepts (Medicare-approved amount as full payment)
NPI (National Provider Identifier)1255386256
CorrectionsReport 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

  1. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
  2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
  3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
  4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
  5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
  6. Medicare Care Compare — official Medicare tool to look up clinicians