Physician Profile
Unclaimed ProfileAbout JOHNSTON
Listed in the NPI registry as a qualified audiologist, Mark Robert Johnston, A.U.D., CCC-A practises in San Antonio, TX. Mark is also listed as specialising in audiologist. According to Medicare claims data, Mark cared for 1,255 Medicare patients across 1,435 services.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Common questions
What does Dr. Johnston specialise in?
Dr. Johnston is a qualified audiologist in San Antonio, TX. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “QUALIFIED AUDIOLOGIST”.
NPI registry
Where is Dr. Johnston located?
Dr. Johnston is listed at 19026 STONE OAK PKWY STE 110, San Antonio, TX 78258. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. Johnston's phone number?
The number on file is (210) 545-0404. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Johnston's NPI number?
Dr. Johnston's National Provider Identifier is 1326295726. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Johnston go to medical school?
Dr. Johnston attended Other, graduating in 2006. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Johnston been practising?
Dr. Johnston has 20 years experience. Calculated from a graduation year of 2006, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Johnston do most often?
According to Medicare billing data, Dr. Johnston provides treatments such as test to assess middle ear function and comprehensive hearing and speech recognition test. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Johnston confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Johnston. If this is you, claiming it is free.
Guide.md
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (210) 545-0404
- Email not available
Practice Locations
19026 STONE OAK PKWY STE 110
San Antonio, TX 78258
Procedures Most Often Billed to Medicare
1,435 services · 1,255 patients · 2 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Test to assess middle ear function | Treatment | 92567 |
741 |
| Comprehensive hearing and speech recognition test | Treatment | 92557 |
694 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
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Claim this profileRelated providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other qualified audiologists in San Antonio 8
Same specialty, same city.
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
More connections — 16 related providers in 2 groups
Class of 2006 at Other 8
Providers who graduated from the same medical school in the same year.
Also performs Test to assess middle ear function 8
Providers in TX who bill this service to Medicare most often.
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.