Margarita Ontiveros, MD
NPI 1346310968 · Cardiovascular Disease Physician · San Antonio, TX
Enrolled with Medicare as Practitioner - Cardiovascular Disease (cardiology) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Margarita Ontiveros, MD is a Cardiovascular Disease Physician provider in San Antonio, TX (NPI 1346310968).
Provider details
- NPI number
- 1346310968
- Entity type
- Individual
- Primary specialty
- Cardiovascular Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- Yes
- License
- H5196 (TX)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
841 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 251 | $121 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 242 | $14 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 85 | $171 |
| Ultrasound of Heart With Color-Depicted Blood Flow, Rate, Direction and Valve Function93306 | 49 | $182 |
| Evaluation of Single, Dual, Multiple Lead Or Leadless Pacemaker System Or Implantable Defibrillator System, Remote Up to 90 Days93296 | 36 | $20 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 34 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Carvedilol | 505 | 188 |
| Metoprolol Succinate | 434 | 159 |
| Isosorbide Mononitratebrand: Isosorbide Mononitrate Er | 330 | 126 |
| Amlodipine Besylate | 315 | 129 |
| Nitroglycerin | 270 | 161 |
| Losartan Potassium | 257 | 102 |
| Rosuvastatin Calcium | 254 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$5,162 across 121 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-09
- Last updated
- 2008-05-01
Frequently asked questions
- What is Margarita Ontiveros's NPI number?
- Margarita Ontiveros's National Provider Identifier (NPI) is 1346310968, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Margarita Ontiveros's specialty?
- Margarita Ontiveros is listed in the NPPES registry with a primary specialty of Cardiovascular Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Margarita Ontiveros located?
- Margarita Ontiveros's practice location on file with NPPES is 311 Camden St, San Antonio, TX 78215-2012.
- What is Margarita Ontiveros's phone number?
- The practice phone number listed in the NPPES registry for Margarita Ontiveros is (210) 281-9800.
- Does Margarita Ontiveros accept Medicare?
- Margarita Ontiveros is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Margarita Ontiveros's NPI active?
- Yes — Margarita Ontiveros's NPI (1346310968) is active in the NPPES registry as of the last update on 2008-05-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.