Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Alexander Clayton Mast, DO

Individual provider Pediatrics Physician · NPI 1679920755

Alexander Clayton Mast, DO is a Pediatrics Physician in Saint Marys, Ohio. Works from 2 locations. Licensed in Michigan.

Licensed in
MI
In the registry since
2016
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

See every abbreviation used in this directory →

Practice location Address checks out

1010 Hager St
Saint Marys, OH 45885-2421
Phone: (419) 394-9579
Fax: (419) 394-9580
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 801 Pro Dr Ste D5, Celina, OH 45822-3307 — (419) 394-9579

Specialties & licences

Pediatrics Physician (primary) Taxonomy 208000000X · Licence 5101024607 (MI)

Record details

NPI number1679920755
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedMay 19, 2016
Last updated in NPPESAugust 2, 2023
Certification dateAugust 2, 2023
Mailing address1140 S Knoxville Ave Ste D, Saint Marys, OH 45885-2609

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