John S. Vassar, M.D.
Anesthesiology Physician · Aberdeen, SD
John S. Vassar, M.D. is an anesthesiology physician with a practice address in Aberdeen, South Dakota, and NPI 1144248295, issued on Jul 17, 2006. Check the license (South Dakota 5857, as entered in NPPES) on the South Dakota Board of Medical and Osteopathic Examiners; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- John S. Vassar
- Credential
- M.D.
- Primary taxonomy
- Anesthesiology Physician 207L00000X
- License number
- 5857 SD
Self-reported in NPPES; status is on the state search - Practice location
- 305 S State St, Aberdeen, SD 57401
- Phone
- (605) 622-5000
- Enumerated
- Jul 17, 2006
- Record last updated
- Jul 9, 2015 (not updated in 11 years: call before relying on the address or phone)
- Fax
- (605) 622-5127
- Medicaid IDs
- 13389 ND
0097002 MT - Entity
- Type 1 · individual
Also registered at 305 S State St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Melchor Aguilar, MDDiagnostic Radiology Physician1811931702
- Christopher Albrecht, PTPhysical Therapist1427436799
- Laura Anderson, OTR/LOccupational Therapist1659703668
- Stacy Anderson, PHARMDPharmacotherapy Pharmacist1942824701
- Marc Armstrong, M.D.Internal Medicine Physician1326453556
- Deptmer Ashley, M.D.Pulmonary Disease Physician1780119669
Verify John S. Vassar in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersSouth Dakota Board of Medical and Osteopathic Examiners
Search for license 5857Check 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 anesthesiology physician records list a practice address in Aberdeen
They are 8 of the 758 NPPES records with a practice address in Aberdeen, and 96 anesthesiology physician records in South Dakota. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 8 in Aberdeen → All 96 in South Dakota → Every provider in Aberdeen →
Other anesthesiology physician records in South Dakota
- Richard Allen, M.D.Rapid City, SD1780663328
- Victoria Antle-Vlach, MDYankton, SD1780615872
- Scott Atchison, MDSioux Falls, SD1245206523
- Stephen Bailey, M.D.Rapid City, SD1104805753
- Phillip Becker, MDMitchell, SD1427092634
- Douglas Bell, MDSioux Falls, SD1649246968
- Jeffrey Bergsbaken, MDWatertown, SD1073527974
- E Blickensderfer, M.D.Rapid City, SD1760461263
- Paul Bonacci, M.D.Chamberlain, SD1689701609
- Lori Borella, M.D.Rapid City, SD1568513679
Common questions
What is John S. Vassar, M.D.'s NPI number?
John S. Vassar, M.D.'s National Provider Identifier (NPI) is 1144248295, issued on Jul 17, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John S. Vassar, M.D. located?
The NPPES record lists a practice address at 305 S State St, Aberdeen, SD, 57401. Phone: (605) 622-5000. Providers update this record themselves, so call before visiting.
How can I verify John S. Vassar, M.D.'s license?
NPPES lists South Dakota license number 5857, as entered by the provider. Search the South Dakota Board of Medical and Osteopathic Examiners at https://www.sdbmoe.gov/. 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.