Mark Clayton Stahl, D.O.
Allergy & Immunology Physician · San Antonio, TX
Mark Clayton Stahl, D.O. is an allergy & immunology physician with a practice address in San Antonio, Texas, and NPI 1912932476, issued on Jul 12, 2006. Check the license (Texas P9742, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- Mark Clayton Stahl
- Credential
- D.O.
- Primary taxonomy
- Allergy & Immunology Physician 207K00000X
- License numbers
- P9742 TX
34.010391 OH
Self-reported in NPPES; status is on the state search - Practice location
- 14615 San Pedro Ave Ste 250, San Antonio, TX 78232
- Phone
- (210) 490-2051
- Enumerated
- Jul 12, 2006
- Record last updated
- Apr 29, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20140801000460); accepts Medicare assignment
- Medical or professional school
- Michigan State University College Of Osteopathic Medicine, 2003
- Entity
- Type 1 · individual
8 nearest allergy & immunology physician records → All 327 in Texas → Look up another NPI →
Also registered at 14615 San Pedro Ave Ste 250
A shared address usually means a shared clinic or building; it does not show who employs whom.
- David Hrncir, M.D.Allergy Physician1023080124
Verify Mark Clayton Stahl in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license P9742Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
8% fewer Medicare Part D claims than the average allergy & immunology physician in 2024
682 Medicare Part D claims for 121 beneficiaries, against an average of 741 among the 2,899 providers of this specialty who prescribed in Part D. Brand-name drugs were 39% of claims.
Most prescribed
- Azelastine Hcl87 claims
- Montelukast Sodium61 claims
- Albuterol Sulfate Hfa53 claims
- Fluticasone Propionate50 claims
- Prednisone42 claims
- Trelegy Ellipta28 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $7,768.39
148 payments; by number, the most common kind was food and beverage; the largest payer was Regeneron Pharmaceuticals, Inc. The 2,496 providers of this specialty with any payment received $8,321.81 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Apex Allergy And Asthma, PLLCSan Antonio, TX
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark Clayton Stahl among 327 allergy & immunology physician records in Texas
Mark Clayton Stahl, D.O. is one of 327 allergy & immunology physician records with a practice address in Texas. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 18% of them.
- NPI issued2006 · 18% of these records are older, 48% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 70% of these records are
- Graduated2003 · median 2003 among the 228 with a school on file
- Record last updated2021 · 48% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207K00000X and a Texas practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Allergy & Immunology Physician providers in Texas
There are 327 allergy & immunology physician records in Texas.
All 327 in Texas → Every provider in San Antonio → Allergy & Immunology Physician nationwide →
The 8 allergy & immunology physician records with the nearest ZIP codes
- Kirk Waibel, M.D.San Antonio, TX 782321881617249
- Miguel Martinez, M.D.Live Oak, TX 782331013091586
- Raul Villarreal, M.D.Live Oak, TX 782331083008908
- Christopher Calabria, MDSan Antonio, TX 782301710071444
- Fiona Adame, DOSan Antonio, TX 782291972168193
- Edward Brooks, M.D.San Antonio, TX 782291134211998
- Damian Chamberlain, MDSan Antonio, TX 782291033773338
- Gordana Gligoric, MDSan Antonio, TX 782291063423119
Common questions
What is Mark Clayton Stahl, D.O.'s NPI number?
Mark Clayton Stahl, D.O.'s National Provider Identifier (NPI) is 1912932476, issued on Jul 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark Clayton Stahl, D.O. located?
The NPPES record lists a practice address at 14615 San Pedro Ave Ste 250, San Antonio, TX, 78232. Phone: (210) 490-2051. Providers update this record themselves, so call before visiting.
How can I verify Mark Clayton Stahl, D.O.'s license?
NPPES lists Texas license number P9742, as entered by the provider. Search the Texas Medical Board at https://profile.tmb.state.tx.us/Search.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark Clayton Stahl, D.O. prescribe under Medicare Part D?
In 2024, Mark Clayton Stahl, D.O. had 682 Medicare Part D claims for 121 beneficiaries; the average among allergy & immunology physician prescribers was 741. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.