DR. MARK CLAYTON STAHL D.O.
NPI 1912932476
Allergy & Immunology in San Antonio, TX

Q: What is Mark Stahl's NPI number?

The NPI number for Mark Stahl is 1912932476. It was assigned to this individual provider in the NPPES registry on July 12, 2006.

Q: What is Mark Stahl's specialty?

The primary specialty registered for this NPI is Allergy & Immunology with taxonomy code 207K00000X.

Q: When was this NPI record last updated?

The NPPES record for Mark Stahl was last updated on April 29, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.

Active since July 12, 2006PECOS EnrolledAccepts Medicare Assignment

14615 SAN PEDRO AVE STE 250, SAN ANTONIO, TX 78232(210) 490-2051 Get Directions Write a Review

NPPES record last updated: April 29, 2021. Verified against the NPPES registry weekly; last sync: October 25, 2026.

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About Dr. Mark Clayton Stahl D.o. NPPES

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

DR. MARK CLAYTON STAHL D.O. (NPI 1912932476) is an individual allergy & immunology provider in San Antonio, Texas, licensed in Texas (P9742) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS and is a graduate of Michigan State University College Of Osteopathic Medicine (2003).

NPPES Registry Identity

NPI1912932476

Entity TypeIndividualMale

Primary Taxonomy207K00000X

Provider Legal NameDR. MARK CLAYTON STAHLCredential: D.O.

Location Address14615 SAN PEDRO AVE STE 250San Antonio, TX 78232-4316

Mailing Address14615 San Pedro Ave Ste 250San Antonio, TX 78232-4316 · (210) 490-2051

Phone(210) 490-2051

Sole ProprietorNo

Medical School CMSMichigan State University College Of Osteopathic MedicineGraduated 2003

Enumeration DateJuly 12, 2006

Last NPPES UpdateApril 29, 2021

NPPES CertifiedApril 29, 2021

✔ NPI 1912932476 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyAllergy & ImmunologyAllopathic & Osteopathic Physicians

Taxonomy Code207K00000X

License✔ Licensed in TX · P9742

Definition

An allergist-immunologist is trained in evaluation, physical and laboratory diagnosis, and management of disorders involving the immune system. Selected examples of such conditions include asthma, anaphylaxis, rhinitis, eczema, and adverse reactions to drugs, foods, and insect stings as well as immune deficiency diseases (both acquired and congenital), defects in host defense, and problems related to autoimmune disease, organ transplantation, or malignancies of the immune system.

Also ListedPediatricsTaxonomy 208000000X · License 34.010391 (OH)

14615 SAN PEDRO AVE STE 250, San Antonio, TX 78232

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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections and more.Insurance ›

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

Dr. Mark Clayton Stahl D.o. 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 ID6800012543

PECOS Enrollment IDI20140801000460

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show Mark Stahl reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Apex Allergy And Asthma PLLC

Same address

Allergy & Immunology

14615 SAN PEDRO AVE STE 250
San Antonio, TX 78232

Reassigned Medicare billing, Texas enrollment
2 clinicians in this Medicare group

NPI 1770166548 (210) 490-2051

Baylor College Of Medicine

10 mi

Pediatrics

333 N SANTA ROSA
San Antonio, TX 78207

Reassigned Medicare billing, Texas enrollment
453 clinicians in this Medicare group

NPI 1285079764 (210) 704-3030

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 9

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.

Professional service for preparation and provision of 1 or more antigens 95165

This service involves the creation and supply of antigens, substances that stimulate your immune system to fight diseases. These antigens can be used in vaccines or allergy tests to help your body build defenses against specific health threats.

1,700 services50 patients

Test for allergy using allergenic extract 95004

An allergy test with allergenic extract is a diagnostic method to identify substances causing allergic reactions. Small amounts of common allergens are introduced to your body, usually through skin pricks or blood tests. Your body's response helps determine your allergies.

1,040 services16 patients

Professional service for multiple injections of allergen 95117

The professional service for multiple injections of allergens involves administering small doses of specific allergens into your body. This is done to help your immune system become less sensitive to them, reducing your allergic reaction over time. It's a safe, effective way to manage allergies.

832 services48 patients

Administration of non-hormonal anti-neoplastic chemotherapy under skin or into muscle 96401

This procedure involves giving anti-cancer drugs, which don't contain hormones, into the muscle or under the skin. These drugs help to stop the growth of cancer cells. The process is usually quick and done by a healthcare professional.

309 services13 patients

Test to measure rate of airflow 94375

This test, known as spirometry, measures how much air you can breathe in and out, and how quickly you can do so. It helps assess your lung function and can be used to diagnose or monitor conditions like asthma or COPD.

124 services40 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

89 services53 patients

Referred Medical Equipment & Supplies CMS DME claims 3

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Supplies for maintenance of non-insulin drug infusion catheter, per week (list drugs separately) A4221

DME-Other DME · category DE017N

1 supplier13 claims20 services$18.36 avg. paid by Medicare

Injection, immune globulin (cuvitru), 100 mg J1555

Treatment-Injections and Infusions (nononcologic) · category RI008N

1 supplier13 claims6,000 services$11.70 avg. paid by Medicare

Supplies for external non-insulin drug infusion pump, syringe type cartridge, sterile, each K0552

DME-Other DME · category DE000N

1 supplier13 claims50 services$2.36 avg. paid by Medicare

Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

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.

DR. DAVID EUGENE HRNCIR M.D.

Allergy & Immunology (Allergy)

14615 SAN PEDRO AVE STE 250
SAN ANTONIO, TX 78232

Bexar County (210) 490-2051

SAN ANTONIO ASTHMA AND ALLERGY

Allergy & Immunology

14615 SAN PEDRO AVE STE 250
SAN ANTONIO, TX 78232

Bexar County (210) 490-2051

APEX ALLERGY AND ASTHMA PLLC

Allergy & Immunology

14615 SAN PEDRO AVE STE 250
SAN ANTONIO, TX 78232

Bexar County (210) 490-2051

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 Stahl's NPI number?

The NPI number for Mark Stahl is 1912932476. It was assigned to this individual provider in the NPPES registry on July 12, 2006.

Where is Mark Stahl located?

Mark Stahl practices at 14615 San Pedro Ave Ste 250, San Antonio, TX 78232. The listed phone number is (210) 490-2051.

What is Mark Stahl's specialty?

The primary specialty registered for this NPI is Allergy & Immunology with taxonomy code 207K00000X.

Is Mark Stahl enrolled in Medicare?

Yes. Mark Stahl 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 organizations bill Medicare for Mark Stahl's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Mark Stahl reassigns Medicare benefits to 2 organizations: Apex Allergy And Asthma PLLC (San Antonio, TX) and Baylor College Of Medicine (San Antonio, TX). Each 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 Stahl's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Mark Stahl accept?

Health plans from Ambetter Health, Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections and Ambetter from Superior HealthPlan and 5 other insurers list Mark Stahl as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Mark Stahl was last updated on April 29, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.