Ronald Drengler, M.D.
NPI 1265459168 · Medical Oncology Physician · San Antonio, TX
Enrolled with Medicare as Practitioner - Medical Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ronald Drengler, M.D. is a Medical Oncology Physician provider in San Antonio, TX (NPI 1265459168).
Provider details
- NPI number
- 1265459168
- Entity type
- Individual
- Primary specialty
- Medical Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- J4091 (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
13,997 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) |
|---|---|---|
| Lactate Dehydrogenase (enzyme) Level83615 | 1,424 | $6 |
| Blood Test, Comprehensive Group of Blood Chemicals80053 | 1,301 | $10 |
| Complete Blood Cell Count (red Cells, White Blood Cell, Platelets), Automated Test and Automated Differential White Blood Cell Count85025 | 1,149 | $8 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 1,069 | $9 |
| Infusion Into a Vein for Therapy, Prevention, Or Diagnosis, Additional Sequential Infusion, 1 Hour Or Less96367 | 972 | $27 |
| Administration of Chemotherapy Into Vein, 1 Hour Or Less96413 | 837 | $122 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 44 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 86 | 33 |
| Prednisone | 80 | 34 |
| Levothyroxine Sodium | 74 | 18 |
| Prochlorperazine Maleate | 72 | 61 |
| Granisetronbrand: Sancuso | 65 | 30 |
| Ondansetronbrand: Ondansetron Odt | 55 | 40 |
| Ondansetron Hcl |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$2,829 across 95 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
- 2006-07-16
- Last updated
- 2013-07-11
Frequently asked questions
- What is Ronald Drengler's NPI number?
- Ronald Drengler's National Provider Identifier (NPI) is 1265459168, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ronald Drengler's specialty?
- Ronald Drengler is listed in the NPPES registry with a primary specialty of Medical Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Ronald Drengler located?
- Ronald Drengler's practice location on file with NPPES is 4383 Medical Dr, San Antonio, TX 78229-3307.
- What is Ronald Drengler's phone number?
- The practice phone number listed in the NPPES registry for Ronald Drengler is (210) 593-5700.
- Does Ronald Drengler accept Medicare?
- Ronald Drengler is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ronald Drengler's NPI active?
- Yes — Ronald Drengler's NPI (1265459168) is active in the NPPES registry as of the last update on 2013-07-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.