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MARK ROBERT JOHNSTON A.U.D., CCC-A
NPI 1326295726
Audiologist in San Antonio, TX

Active since August 27, 2008Accepts Medicare Assignment
19026 STONE OAK PKWY, STE 110, SAN ANTONIO, TX 78258(210) 545-0404(210) 614-1003 Get Directions Write a Review

NPPES record last updated: August 27, 2008. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Mark Robert Johnston A.u.d., Ccc-a NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MARK ROBERT JOHNSTON A.U.D., CCC-A (NPI 1326295726) is an individual audiologist in San Antonio, Texas, licensed in Texas (50770) and active in the NPI registry since August 2008. He is a graduate of Other (2006).

NPPES Registry Identity

NPI1326295726
Entity TypeIndividualMale
Primary Taxonomy231H00000X
Provider Legal NameMARK ROBERT JOHNSTONCredential: A.U.D., CCC-A
Location Address19026 STONE OAK PKWY, STE 110San Antonio, TX 78258
Mailing AddressP.o. Box 2679San Antonio, TX 78299 · (210) 616-0121 · Fax (210) 614-1003
Phone(210) 545-0404
Fax(210) 614-1003
Sole ProprietorNo
Medical School CMSOtherGraduated 2006
Enumeration DateAugust 27, 2008
✔ NPI 1326295726 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyAudiologistSpeech, Language and Hearing Service Providers
Taxonomy Code231H00000X
License✔ Licensed in TX · 50770
Definition
(1) A specialist in evaluation, habilitation and rehabilitation of those whose communication disorders center in whole or in part in hearing function. Audiologists are autonomous professionals who identify, assess, and manage disorders of the auditory, balance and other neural systems. Audiologists provide audiological (aural) rehabilitation to children and adults across the entire age span. Audiologists select, fit and dispense amplification systems such as hearing aids and related devices. (2) An audiologist is a person qualified by a master's degree in audiology, licensed by the state, where applicable, and practicing within the scope of that license. Audiologists evaluate and treat patients with impaired hearing. They plan, direct and conduct rehabilitative programs with audiotry substitutional devises (hearing aids) and other therapy.
19026 STONE OAK PKWY, San Antonio, TX 78258
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Mark Robert Johnston A.u.d., Ccc-a is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID7810054194
PECOS Enrollment IDI20090401000349

Medicare Billing Reassignment

Medicare enrollment records show Mark Johnston reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Alamo Ent Associates
11 mi
Otolaryngology
7840 FLOYD CUEL, SUITE 400
San Antonio, TX 78229
  • Reassigned Medicare billing, Texas enrollment
  • 9 clinicians in this Medicare group
NPI 1841208832 (210) 616-0096

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 2

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Test to assess middle ear function 92567
A test to assess middle ear function, also known as an impedance audiometry, helps evaluate how well your middle ear works. It measures the movement of your eardrum in response to changes in air pressure. This can help identify issues like fluid build-up, ear infections, or eardrum perforations.
741 services640 patients
Comprehensive hearing and speech recognition test 92557
A comprehensive hearing and speech recognition test assesses your ability to hear and understand spoken words. It includes hearing tests to check for issues with sound perception and speech tests to evaluate your word recognition. It's a crucial step in identifying any hearing or speech problems.
694 services615 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 78258 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$54.84 typical visit price
range $54.84 – $166.88
Typical copayment $13.71 (range $13.71 – $41.72)
Most-billed visit code 99202
Established Patient
$68.55 typical visit price
range $17.52 – $136.11
Typical copayment $17.13 (range $4.38 – $34.02)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 3

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

CHARLES P BIEDIGER MD
Otolaryngology
19026 STONE OAK PKWY, SUITE 110
SAN ANTONIO, TX 78258
Bexar County (210) 545-0404
DR. LYUDMILA VASILIEVNA HARTT M.D.
Psychiatry & Neurology (Child & Adolescent Psychiatry)
19026 STONE OAK PKWY, 205
SAN ANTONIO, TX 78258
Bexar County (210) 495-4085
HEART MEDICAL GROUP, P.A.
Clinic/Center (Adolescent and Children Mental Health)
19026 STONE OAK PKWY, #205
SAN ANTONIO, TX 78258
Bexar County (210) 317-4800

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Mark Johnston's NPI number?

The NPI number for Mark Johnston is 1326295726. It was assigned to this individual provider in the NPPES registry on August 27, 2008.

Where is Mark Johnston located?

Mark Johnston practices at 19026 Stone Oak Pkwy Ste 110, San Antonio, TX 78258. The listed phone number is (210) 545-0404.

What is Mark Johnston's specialty?

The primary specialty registered for this NPI is Audiologist with taxonomy code 231H00000X.

Is Mark Johnston enrolled in Medicare?

Yes. Mark Johnston is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for Mark Johnston's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Mark Johnston reassigns Medicare benefits to Alamo Ent Associates (San Antonio, TX). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Mark Johnston's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Mark Johnston was last updated on August 27, 2008. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.