John Frierson, M.D.
NPI 1326021015 · Interventional Cardiology Physician · San Antonio, TX
Enrolled with Medicare as Practitioner - Interventional Cardiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Frierson, M.D. is a Interventional Cardiology Physician provider in San Antonio, TX (NPI 1326021015).
Provider details
- NPI number
- 1326021015
- Entity type
- Individual
- Primary specialty
- Interventional Cardiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- G3371 (TX)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 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
3,181 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) |
|---|---|---|
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 756 | $13 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 490 | $173 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 387 | $123 |
| Complete Ultrasound Study of Arm and Leg Arteries93923 | 290 | $110 |
| Ultrasound of Both Sides of Head and Neck Blood Flow93880 | 241 | $177 |
| Ultrasound of Heart With Color-Depicted Blood Flow, Rate, Direction and Valve Function |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 70 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 679 | 220 |
| Ezetimibe | 600 | 206 |
| Amlodipine Besylate | 590 | 203 |
| Metoprolol Succinate | 459 | 159 |
| Losartan Potassium | 424 | 155 |
| Doxazosin Mesylate | 333 | 117 |
| Rosuvastatin Calcium | 316 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$291 across 14 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
- 2005-11-28
- Last updated
- 2022-03-29
- Certified
- 2022-03-29
Frequently asked questions
- What is John Frierson's NPI number?
- John Frierson's National Provider Identifier (NPI) is 1326021015, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Frierson's specialty?
- John Frierson is listed in the NPPES registry with a primary specialty of Interventional Cardiology Physician (Allopathic & Osteopathic Physicians).
- Where is John Frierson located?
- John Frierson's practice location on file with NPPES is 1200 Brooklyn Ave, San Antonio, TX 78212-4816.
- What is John Frierson's phone number?
- The practice phone number listed in the NPPES registry for John Frierson is (210) 271-7266.
- Does John Frierson accept Medicare?
- John Frierson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Frierson's NPI active?
- Yes — John Frierson's NPI (1326021015) is active in the NPPES registry as of the last update on 2022-03-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.