Quick answers
- Does Ernesto C. Guerra Jr. accept Medicare assignment?
- Yes. Medicare's clinician data says Ernesto C. Guerra Jr. 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 Ernesto C. Guerra Jr. see?
- In 2024, CMS data shows 698 Original Medicare patients and 10,702 services for Ernesto C. Guerra Jr.. This counts Original Medicare only and measures volume, not quality.
- What is Ernesto C. Guerra Jr.'s NPI number?
- 1558366435. 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 Ernesto C. Guerra Jr., 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 | 698 |
|---|---|
| Services billed to Medicare | 10,702 |
| Different services or procedures | 27 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)269 services
- Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)220 services
- Colorectal cancer screening; colonoscopy on individual at high risk (G0105)127 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)92 services
- Biopsy of large bowel using a flexible endoscope (45380)90 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%
- Arthritis48%
- Diabetes42%
- Ischemic heart disease30%
- Chronic kidney disease29%
Hospitals where Ernesto C. Guerra Jr. works
Medicare's Facility Affiliation Data lists Ernesto C. Guerra Jr. 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.
- Fort Duncan Medical CenterEagle Pass, TX · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 450092
- Methodist HospitalSan Antonio, TX · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 450388
Practice locations
Addresses where Ernesto C. Guerra Jr. is enrolled with Medicare (CMS data updated October 2, 2026).
- 520 E Euclid AveSan Antonio, TX 78212 (210) 271‑0606
- 5425 W Spring Creek Pkwy, Suite 205Plano, TX 75024 (972) 526‑5860
- 601 S Main StKeller, TX 76248 (817) 741‑4347
- P O Box, Suite 35629Dallas, TX 75235
- PO Box, Suite 35629Dallas, TX 75235
Group practices
Medicare enrollment lists Ernesto C. Guerra Jr. as a member of this group (CMS data updated October 2, 2026).
- Texas Digestive Disease Consultants, PLLC608 clinicians in the group
Specialties
- Gastroenterologyprimary
- Internal Medicinealso
Other gastroenterologists in San Antonio
Clinicians with the same Medicare primary specialty in San Antonio, TX — not a recommendation.
Other clinicians in Texas Digestive Disease Consultants, PLLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of California, San Diego School Of Medicine |
| Graduation year | 1976 (50 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1558366435 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- 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