Alexander Clayton Mast, DO
Pediatrics Physician · Saint Marys, OH
Alexander Clayton Mast, DO is a pediatrics physician with a practice address in Saint Marys, Ohio, and NPI 1679920755, issued on May 19, 2016. Check the license on the State Medical Board of Ohio; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Alexander Clayton Mast
- Credential
- DO
- Primary taxonomy
- Pediatrics Physician 208000000X
- License number
- 5101024607 MI
Self-reported in NPPES; status is on the state search - Practice location
- 1010 Hager St, Saint Marys, OH 45885
- Phone
- (419) 394-9579
- Enumerated
- May 19, 2016
- Record last updated
- Aug 2, 2023
- Fax
- (419) 394-9580
- Entity
- Type 1 · individual
Also registered at 1010 Hager St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Efren Aganon, MDPediatrics Physician1184629214
- Thomas Zegarski, MDPediatrics Physician1740273531
Verify Alexander Clayton Mast in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersState Medical Board of OhioCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3 pediatrics physician records list a practice address in Saint Marys
They are 3 of the 169 NPPES records with a practice address in Saint Marys, and 2,972 pediatrics physician records in Ohio. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 3 in Saint Marys → All 2,972 in Ohio → Every provider in Saint Marys →
Other pediatrics physician records in Ohio
- Sagiv Aaron, M.D.Independence, OH1780080754
- Lisa Abate, D.O.Findlay, OH1457421950
- Fadia Abaza, MDMaumee, OH1013913243
- Mohamad Abaza, M.D.Oregon, OH1184621963
- Wahida Abaza, MDDublin, OH1750383493
- Collin Abbott, MDColumbus, OH1477945889
- Fadhil Abbousy, MDHartville, OH1346345204
- Jasmin Abdallah, MDCleveland, OH1447007372
- Hanaa Abdelmessih, MDNewark, OH1073511358
- Adli Abdelrahim, MDCleveland, OH1942498043
Common questions
What is Alexander Clayton Mast, DO's NPI number?
Alexander Clayton Mast, DO's National Provider Identifier (NPI) is 1679920755, issued on May 19, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Alexander Clayton Mast, DO located?
The NPPES record lists a practice address at 1010 Hager St, Saint Marys, OH, 45885. Phone: (419) 394-9579. Providers update this record themselves, so call before visiting.
How can I verify Alexander Clayton Mast, DO's license?
Search the State Medical Board of Ohio at https://elicense.ohio.gov/oh_verifylicense. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. 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.