NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Thomas L Mertz, DO, PHARMD.

Allergy & Immunology Physician in Pittsburgh, PA · enumerated 2007 · practices at Allergy & Asthma Associates of Pittsburgh.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1942495825

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Dr. Thomas L Mertz
Credential DO, PHARMD.
Sex Male
Practice address 2585 Freeport Rd Ste 210, Pittsburgh, PA, 15238
Phone (412) 828-3800
Fax (412) 828-8561
Enumeration date Sep 13, 2007
Last updated in NPPES Jun 5, 2023

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 046528 (CT) Secondary
208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License 046528 (CT) Secondary
207K00000X Allergy & Immunology Physician Allopathic & Osteopathic Physicians · License OS015695 (PA) Primary
DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Thomas Mertz practice?
The practice location on file with NPPES is in Pittsburgh, PA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Thomas Mertz?
The National Provider Identifier (NPI) for Thomas Mertz is 1942495825, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-06-05.