John Mastrovich, M.D., P.A.
NPI 1538264213 · Allergy & Immunology Physician · San Antonio, TX
Enrolled with Medicare as Part B Supplier - Clinic/Group Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Mastrovich, M.D., P.A. is a Allergy & Immunology Physician organization in San Antonio, TX (NPI 1538264213).
Provider details
- NPI number
- 1538264213
- Entity type
- Organization
- Primary specialty
- Allergy & Immunology PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- John Mastrovich, President(210) 342-6200
- 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 tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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.
Practice location
Mailing address
Other names (DBA / former)
- Other name
- Family Allergy and Asthma Specialists
Registry dates
- Enumerated
- 2006-09-14
- Last updated
- 2007-10-12
Frequently asked questions
- What is John Mastrovich, M.D., P.A.'s NPI number?
- John Mastrovich, M.D., P.A.'s National Provider Identifier (NPI) is 1538264213, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is John Mastrovich, M.D., P.A.?
- John Mastrovich, M.D., P.A. is classified in the NPPES registry as Allergy & Immunology Physician (Allopathic & Osteopathic Physicians).
- Where is John Mastrovich, M.D., P.A. located?
- John Mastrovich, M.D., P.A.'s practice location on file with NPPES is 20650 Stone Oak Pkwy, San Antonio, TX 78258-7355.
- What is John Mastrovich, M.D., P.A.'s phone number?
- The practice phone number listed in the NPPES registry for John Mastrovich, M.D., P.A. is (210) 342-6200.
- Does John Mastrovich, M.D., P.A. accept Medicare?
- John Mastrovich, M.D., P.A. is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Who is the authorized official for John Mastrovich, M.D., P.A.?
- The authorized official listed on John Mastrovich, M.D., P.A.'s NPPES record is John Mastrovich, President. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is John Mastrovich, M.D., P.A.'s NPI active?
- Yes — John Mastrovich, M.D., P.A.'s NPI (1538264213) 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.