NPI registry status
Active
2026 NPPES data Allergy & Immunology Physician NPI 1740205418 M.D.
Verify on CMS → John Mastrovich, M.D.
Allergy & Immunology Physician in San Antonio, Texas.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 3,394 in Allergy & Immunology Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
253
Medicare Part D claims · 56 beneficiaries · Allergy & Immunology Physician avg: 764
Generic prescribing
73%
generic claims · 27% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
John Mastrovich, M.D. filed 253 Medicare Part D claims in 2023 as a Allergy & Immunology Physician in San Antonio, Texas, prescribing 73% generic.
- 253
- Part D claims, 2023
- 73%
- generic prescribing
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
John Mastrovich, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
253 49th percentile higher than 49% of 1,370,886 prescribers
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source CMS Medicare Part D Prescriber Public Use File · 2023
◑
Board-eligible specialty (heuristic, not verified)
John Mastrovich, M.D. practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about John Mastrovich, M.D.?
Quality data not reportedPrimary specialty
Allergy & Immunology Physician
Medicare Part D claims
253 67% vs specialty avg
Specialty distribution in Texas
How Allergy & Immunology Physician compares to other specialties among Texas providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Allergy & Immunology Physician. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
John Mastrovich, M.D. appears in the CMS NPPES registry as an Allergy & Immunology Physician provider holding M.D. credentials at 20650 STONE OAK PKWY, San Antonio, TX, 78258, with a listed phone of (210) 342-6200. NPI 1740205418 was issued on 07/13/2006.
Medicare Part D records for calendar year 2023 show 253 prescription claims written by this provider, covering 56 Medicare beneficiaries and totaling roughly $35K in drug spend, split 27% brand-name and 73% generic by claim count.
Allergy & Immunology Physician is a narrow specialty nationwide, with 3,394 enrolled providers across 52 states and an average of 764 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1740205418 |
|---|---|
| Specialty | Allergy & Immunology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 07/13/2006 |
License & disciplinary context - Texas TMB 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~77K Texas medical licensees in 2023 - they are NOT specific to John Mastrovich, M.D.. To verify John Mastrovich, M.D.'s current license status, search the TMB public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
344
Total board actions, Texas 2023
Across 334 cases
4.47
Actions per 1,000 licensees
Texas statewide rate
probation
Most common action type
94 cases
TMB publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the Texas disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Above average
John Mastrovich, M.D. - brand share 27.0%
Allergy & Immunology Physician average
27% brand-name claims vs 73% generic, on 253 2023 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
253
Total Claims
$35K
Total Drug Cost
56
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 459
- Total Day Supply
- 12,676
- Brand vs Generic
- 27% brand / 73% generic
- Brand Drug Cost
- $29K
- Generic Drug Cost
- $6K
- Antibiotic Claims
- 12
Patient Demographics
- Average Patient Age
- 70.8 years
- Avg HCC Risk Score
- 0.88
- Gender Split
- 68% female / 32% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What John Mastrovich, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Fluticasone Propio…
Fluticasone Propionate
41 claims
- Montelukast Sodium
Montelukast Sodium
36 claims
- Azelastine Hcl
Azelastine Hcl
22 claims
- Levocetirizine Dih… 16
Levocetirizine Dihydrochloride
16 claims
- Albuterol Sulfate … 12
Albuterol Sulfate Hfa
12 claims
| Drug | Claims |
|---|---|
| Fluticasone Propionate | 41 |
| Montelukast Sodium | 36 |
| Azelastine Hcl | 22 |
| Levocetirizine Dihydrochloride | 16 |
| Albuterol Sulfate Hfa Albuterol Sulfate | 12 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Allergy & Immunology Physician Overview
How John Mastrovich, M.D. fits within the Allergy & Immunology Physician landscape nationally.
3,394
Allergy & Immunology Physician Providers in US
52
States with Allergy & Immunology Physician
764
Avg Claims per Provider
John Mastrovich, M.D.'s 253 claims are below the specialty average of 764.
Nearby Allergy & Immunology Physician Providers in Texas
Other clinicians with the same primary specialty enrolled in Texas, drawn from the same CMS NPPES roster as Mastrovich.
Dr. Margaret Adair
M.D.
Coppell, TX
Dr. Fiona Adame
DO
Galveston, TX
Dr. Nedal Adi
M.D.
Webster, TX
Dr. Colleen Adkins
M.D.
Austin, TX
Dr. Tonia Afshan
MD, MPH
Austin, TX
Compare Allergy & Immunology Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the Texas medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Allergy & Immunology Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
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Frequently Asked Questions
What is John Mastrovich, M.D.'s specialty? ▼
John Mastrovich, M.D. specializes in Allergy & Immunology Physician and practices in San Antonio, Texas. Credentials: M.D..
How much does John Mastrovich, M.D. prescribe under Medicare Part D? ▼
In 2023, John Mastrovich, M.D. wrote 253 Medicare Part D claims totaling $35K in drug costs for 56 beneficiaries.
Where is John Mastrovich, M.D. located? ▼
John Mastrovich, M.D. is located at 20650 STONE OAK PKWY, San Antonio, TX, 78258. Phone: (210) 342-6200.
What is John Mastrovich, M.D.'s NPI number? ▼
John Mastrovich, M.D.'s National Provider Identifier (NPI) is 1740205418, issued on 07/13/2006.
Does John Mastrovich, M.D. prescribe more brand-name or generic drugs? ▼
John Mastrovich, M.D.'s prescribing is 27% brand-name and 73% generic drugs by claim count, with $29K in brand drug costs.
How many Allergy & Immunology Physician providers are there in the US? ▼
There are 3,394 Allergy & Immunology Physician providers across 52 states in the US. The average Allergy & Immunology Physician provider writes 764 Medicare Part D claims per year.
What drugs does John Mastrovich, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, John Mastrovich, M.D.'s most frequently prescribed drugs include Fluticasone Propionate, Montelukast Sodium, Azelastine Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does John Mastrovich, M.D. accept Medicare? ▼
John Mastrovich, M.D. appears in CMS Medicare data with 253 Part D claims and 56 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify John Mastrovich, M.D.'s credentials? ▼
John Mastrovich, M.D.'s NPI is 1740205418 with credentials M.D.. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Compiled from official public sources by the PlainDoctor editorial team.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.