Thomas L. Mertz, DO, PHARMD.
Allergy & Immunology Physician · Pittsburgh, PA
Thomas L. Mertz, DO, PHARMD. is an allergy & immunology physician with a practice address in Pittsburgh, Pennsylvania, and NPI 1942495825, issued on Sep 13, 2007. Check the license (Pennsylvania OS015695, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- Thomas L. Mertz
- Credential
- DO, PHARMD.
- Primary taxonomy
- Allergy & Immunology Physician 207K00000X
- License numbers
- OS015695 PA
046528 CT
Self-reported in NPPES; status is on the state search - Practice location
- 2585 Freeport RD Ste 210, Pittsburgh, PA 15238
- Phone
- (412) 828-3800
- Enumerated
- Sep 13, 2007
- Record last updated
- Jun 5, 2023
- Fax
- (412) 828-8561
- Medicare enrollment
- Enrolled (PECOS I20120830000324); accepts Medicare assignment
- Medical or professional school
- Lake Erie College Of Osteopathic Medicine, Erie, 2004
- Entity
- Type 1 · individual
8 nearest allergy & immunology physician records → All 183 in Pennsylvania → Look up another NPI →
Also registered at 2585 Freeport RD Ste 210
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Richard Green, M.D.Allergy Physician1164427480
- Andrew Vayonis, M.D.Allergy Physician1194720425
Verify Thomas L. Mertz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license OS015695Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.1 times the Medicare Part D claims of the average allergy & immunology physician in 2024
1,591 Medicare Part D claims for 332 beneficiaries, against an average of 741 among the 2,899 providers of this specialty who prescribed in Part D. Brand-name drugs were 24% of claims.
Most prescribed
- Montelukast Sodium254 claims
- Fluticasone Propionate228 claims
- Azelastine Hcl204 claims
- Famotidine114 claims
- Albuterol Sulfate Hfa81 claims
- Ventolin Hfa59 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.
Bills Medicare through one group practice
- Allergy And Asthma Associates OF PittsburghPittsburgh, PA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Thomas L. Mertz among 183 allergy & immunology physician records in Pennsylvania
Thomas L. Mertz, DO, PHARMD. is one of 183 allergy & immunology physician records with a practice address in Pennsylvania. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 51% of them.
- NPI issued2007 · 51% of these records are older, 36% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2004 · median 2000 among the 109 with a school on file
- Record last updated2023 · 61% 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 Pennsylvania 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 Pennsylvania
There are 183 allergy & immunology physician records in Pennsylvania.
All 183 in Pennsylvania → Every provider in Pittsburgh → Allergy & Immunology Physician nationwide →
The 8 allergy & immunology physician records with the nearest ZIP codes
- Sergei Belenky, MDPittsburgh, PA 152371750373171
- Stephen Murphey, MDPittsburgh, PA 152371538157060
- Robert Otte, MDPittsburgh, PA 152351386689305
- Hey ChongPittsburgh, PA 152241386804037
- Christin Deal, M.D.Pittsburgh, PA 152241003253477
- Zerina Hodzic, MDPittsburgh, PA 152241477081370
- Chantal Lemoine Soto, M.D.Pittsburgh, PA 152241548828973
- Russell Traister, M.D., PH.D.Pittsburgh, PA 152241336300672
Common questions
What is Thomas L. Mertz, DO, PHARMD.'s NPI number?
Thomas L. Mertz, DO, PHARMD.'s National Provider Identifier (NPI) is 1942495825, issued on Sep 13, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Thomas L. Mertz, DO, PHARMD. located?
The NPPES record lists a practice address at 2585 Freeport RD Ste 210, Pittsburgh, PA, 15238. Phone: (412) 828-3800. Providers update this record themselves, so call before visiting.
How can I verify Thomas L. Mertz, DO, PHARMD.'s license?
NPPES lists Pennsylvania license number OS015695, as entered by the provider. Search the Pennsylvania Department of State (PALS) at https://www.pals.pa.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Thomas L. Mertz, DO, PHARMD. prescribe under Medicare Part D?
In 2024, Thomas L. Mertz, DO, PHARMD. had 1,591 Medicare Part D claims for 332 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.