John Mastrovich, M.D.
NPI 1740205418 · Allergy & Immunology Physician · San Antonio, TX
Enrolled with Medicare as Practitioner - Allergy/Immunology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Mastrovich, M.D. is a Allergy & Immunology Physician provider in San Antonio, TX (NPI 1740205418).
Provider details
- NPI number
- 1740205418
- Entity type
- Individual
- Primary specialty
- Allergy & Immunology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- L2449 (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
790 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) |
|---|---|---|
| Professional Service for Preparation and Provision of 1 Or More Antigens95165 | 517 | $14 |
| Professional Service for Multiple Injections of Allergen95117 | 176 | $11 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 71 | $87 |
| Test to Measure Rate of Airflow94375 | 26 | $37 |
Typical Medicare-allowed amounts for these services range $11–$87 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote 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 |
|---|---|---|
| Fluticasone Propionate | 45 | 22 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 30 | 17 |
| Fluticasone/Umeclidin/Vilanterbrand: Trelegy Ellipta | 27 | — |
| Montelukast Sodium | 25 | — |
| Fluticasone Propion/Salmeterolbrand: Fluticasone-Salmeterol | 13 | — |
| Fluticasone Propion/Salmeterolbrand: Wixela Inhub | 12 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-13
- Last updated
- 2007-10-12
Frequently asked questions
- What is John Mastrovich's NPI number?
- John Mastrovich's National Provider Identifier (NPI) is 1740205418, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Mastrovich's specialty?
- John Mastrovich is listed in the NPPES registry with a primary specialty of Allergy & Immunology Physician (Allopathic & Osteopathic Physicians).
- Where is John Mastrovich located?
- John Mastrovich's practice location on file with NPPES is 20650 Stone Oak Pkwy, San Antonio, TX 78258-7355.
- What is John Mastrovich's phone number?
- The practice phone number listed in the NPPES registry for John Mastrovich is (210) 342-6200.
- Does John Mastrovich accept Medicare?
- John Mastrovich is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Mastrovich's NPI active?
- Yes — John Mastrovich's NPI (1740205418) is active in the NPPES registry as of the last update on 2007-10-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.