Benjamin Clarence Aaker, MD
Emergency Medicine Physician · Yankton, SD
Benjamin Clarence Aaker, MD is an emergency medicine physician with a practice address in Yankton, South Dakota, and NPI 1811198278, issued on May 31, 2007. Check the license (South Dakota SD7930, as entered in NPPES) on the South Dakota Board of Medical and Osteopathic Examiners; the Medicare figures below come from public CMS files.
- Name
- Benjamin Clarence Aaker
- Credential
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- SD7930 SD
Self-reported in NPPES; status is on the state search - Practice location
- 501 Summit St, Yankton, SD 57078
- Phone
- (605) 668-8100
- Enumerated
- May 31, 2007
- Record last updated
- Dec 27, 2017 (not updated in 9 years: call before relying on the address or phone)
- Medicaid IDs
- 10025121700 NE
10024995100 NE - Medicare enrollment
- Enrolled (PECOS I20110218000244); accepts Medicare assignment
- Medical or professional school
- University Of Nebraska College Of Medicine, 2005
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 122 in South Dakota → Look up another NPI →
Also registered at 501 Summit St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Cortney Arkfeld, RNMedical-Surgical Registered Nurse1265132245
- Theophilus Bortier, MDInternal Medicine Physician1861141939
- Susan Bruening, CRNACertified Registered Nurse Anesthetist1093881906
- Calley BuckleyCertified Registered Nurse Anesthetist1467918144
- William Cohen, MDPain Medicine (Physical Medicine & Rehabilitation) Physician1407896301
Verify Benjamin Clarence Aaker 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 SD7930Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
85% fewer Medicare Part D claims than the average emergency medicine physician in 2024
34 Medicare Part D claims for 28 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
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
- Prairie Lakes Health Care System IncWatertown, SD
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Benjamin Clarence Aaker among 122 emergency medicine physician records in South Dakota
Benjamin Clarence Aaker, MD is one of 122 emergency medicine physician records with a practice address in South Dakota. 80% 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 45% of them.
- NPI issued2007 · 45% of these records are older, 45% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 38% of these records are
- Graduated2005 · median 2005 among the 45 with a school on file
- Record last updated2017 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a South Dakota practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medicine Physician providers in South Dakota
There are 122 emergency medicine physician records in South Dakota.
All 122 in South Dakota → Every provider in Yankton → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Courtney MerkwanYankton, SD 570781295908770
- Roy Mortinsen, M.D.Vermillion, SD 570691417954918
- Nicole SchimelpfenigVermillion, SD 570691023793031
- Richard Burruss, M.D.Sioux Falls, SD 571031447244389
- Timothy Nydam, M.D.Sioux Falls, SD 571041972714533
- Kelly Rhone, MDSioux Falls, SD 571041467463877
- Collin Vaughn, M.D.Sioux Falls, SD 571041104933068
- John Belk, DOSioux Falls, SD 571051346254984
Common questions
What is Benjamin Clarence Aaker, MD's NPI number?
Benjamin Clarence Aaker, MD's National Provider Identifier (NPI) is 1811198278, issued on May 31, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Benjamin Clarence Aaker, MD located?
The NPPES record lists a practice address at 501 Summit St, Yankton, SD, 57078. Phone: (605) 668-8100. Providers update this record themselves, so call before visiting.
How can I verify Benjamin Clarence Aaker, MD's license?
NPPES lists South Dakota license number SD7930, 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.
How much does Benjamin Clarence Aaker, MD prescribe under Medicare Part D?
In 2024, Benjamin Clarence Aaker, MD had 34 Medicare Part D claims for 28 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.