Mark Thornton, MD
NPI 1669552790 · Internal Medicine Physician · San Antonio, TX
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Thornton, MD is a Internal Medicine Physician provider in San Antonio, TX (NPI 1669552790).
Provider details
- NPI number
- 1669552790
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- F7234 (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
469 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 264 | $85 |
| Administration of Influenza Virus VaccineG0008 | 116 | $31 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 39 | $9 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 39 | $122 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 11 | $12 |
Typical Medicare-allowed amounts for these services range $9–$122 (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 · 115 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 340 | 88 |
| Rosuvastatin Calcium | 260 | 71 |
| Levothyroxine Sodium | 202 | 47 |
| Losartan Potassium | 202 | 43 |
| Amlodipine Besylate | 176 | 37 |
| Escitalopram Oxalate | 149 | 23 |
| Apixaban |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-10-16
- Last updated
- 2007-07-08
Frequently asked questions
- What is Mark Thornton's NPI number?
- Mark Thornton's National Provider Identifier (NPI) is 1669552790, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Thornton's specialty?
- Mark Thornton is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Thornton located?
- Mark Thornton's practice location on file with NPPES is 7720 Jones Maltsberger Rd, San Antonio, TX 78216-6946.
- What is Mark Thornton's phone number?
- The practice phone number listed in the NPPES registry for Mark Thornton is (210) 822-2004.
- Does Mark Thornton accept Medicare?
- Mark Thornton is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Thornton's NPI active?
- Yes — Mark Thornton's NPI (1669552790) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.