Oscar Alvarez, MD
NPI 1376565838 · Gastroenterology Physician · Harlingen, TX
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Oscar Alvarez, MD is a Gastroenterology Physician provider in Harlingen, TX (NPI 1376565838).
Provider details
- NPI number
- 1376565838
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- J5967 (TX)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
108 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 33 | $74 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 25 | $82 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 23 | $235 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 16 | $83 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 11 | $105 |
Typical Medicare-allowed amounts for these services range $74–$235 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 7 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Omeprazole | 74 | 41 |
| Pantoprazole Sodium | 32 | 19 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Peg-3350 and Electrolytes | 31 | 31 |
| Famotidine | 18 | — |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-G | 13 | 13 |
| Linaclotidebrand: Linzess | 13 | — |
| Amoxicillin | 11 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-24
- Last updated
- 2022-07-14
- Certified
- 2022-07-14
Frequently asked questions
- What is Oscar Alvarez's NPI number?
- Oscar Alvarez's National Provider Identifier (NPI) is 1376565838, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Oscar Alvarez's specialty?
- Oscar Alvarez is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Oscar Alvarez located?
- Oscar Alvarez's practice location on file with NPPES is 512 Victoria Ln Ste 2, Harlingen, TX 78550-3227.
- What is Oscar Alvarez's phone number?
- The practice phone number listed in the NPPES registry for Oscar Alvarez is (956) 365-4400.
- Does Oscar Alvarez accept Medicare?
- Oscar Alvarez is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Oscar Alvarez's NPI active?
- Yes — Oscar Alvarez's NPI (1376565838) is active in the NPPES registry as of the last update on 2022-07-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.