BENJAMIN CLARENCE AAKER MD
NPI 1811198278
Emergency Medicine in Yankton, SD
About Benjamin Clarence Aaker Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
BENJAMIN CLARENCE AAKER MD (NPI 1811198278) is an individual emergency medicine provider in Yankton, South Dakota, licensed in South Dakota (SD7930) and active in the NPI registry since May 2007. He is enrolled in Medicare PECOS, is affiliated with Prairie Lakes Healthcare System, Inc, and is a graduate of University Of Nebraska College Of Medicine (2005).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 2
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Benjamin Clarence Aaker Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
5Medicare enrollment records show Benjamin Aaker reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Yankton, SD 57078
- Reassigned Medicare billing, South Dakota enrollment
- 227 clinicians in this Medicare group
Tea, SD 57064
- Reassigned Medicare billing, South Dakota enrollment
- 1,277 clinicians in this Medicare group
Mitchell, SD 57301
- Reassigned Medicare billing, South Dakota enrollment
- 94 clinicians in this Medicare group
Watertown, SD 57201
- Reassigned Medicare billing, South Dakota enrollment
- 109 clinicians in this Medicare group
Webster, SD 57274
- Reassigned Medicare billing, South Dakota enrollment
- Medicare enrollment name: Avera St Lukes
- 259 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 3
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 4
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Prairie Lakes Healthcare System, Inc
Acute Care Hospitals · Watertown, SDAvera Sacred Heart Hospital
Acute Care Hospitals · Yankton, SDAvera Mckennan Hospital & University Health Center
Acute Care Hospitals · Sioux Falls, SDAvera Queen Of Peace
Critical Access Hospitals · Mitchell, SDPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 57078 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
YANKTON, SD 57078
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Benjamin Aaker's NPI number?
The NPI number for Benjamin Aaker is 1811198278. It was assigned to this individual provider in the NPPES registry on May 31, 2007.
Where is Benjamin Aaker located?
Benjamin Aaker practices at 501 Summit St, Yankton, SD 57078. The listed phone number is (605) 668-8100.
What is Benjamin Aaker's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Benjamin Aaker enrolled in Medicare?
Yes. Benjamin Aaker is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Benjamin Aaker's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Benjamin Aaker reassigns Medicare benefits to 5 organizations: Sacred Heart Health Services (Yankton, SD), Avera Mckennan (Tea, SD), Avera Queen Of Peace (Mitchell, SD), Prairie Lakes Health Care System Inc (Watertown, SD) and Avera Medical Group Webster (Webster, SD). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Benjamin Aaker's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Benjamin Aaker accept?
Health plans from Avera Health Plans, Oscar Insurance Company, Sanford Health Plan, Wellmark Health Plan of Iowa, Inc. and Wellmark of South Dakota, Inc. list Benjamin Aaker as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Benjamin Aaker affiliated with any hospitals?
According to CMS data, Benjamin Aaker is affiliated with Prairie Lakes Healthcare System, Inc, Avera Sacred Heart Hospital, Avera Mckennan Hospital & University Health Center and Avera Queen Of Peace.
When was this NPI record last updated?
The NPPES record for Benjamin Aaker was last updated on December 27, 2017. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Benjamin Clarence Aaker, MD · NPI 1811198278
Emergency Medicine physician in Yankton, South Dakota. Individual provider, active in the CMS NPPES registry since May 31, 2007.
## Identity
- **NPI:** 1811198278 (Entity type: Individual)
- **Enumerated:** May 31, 2007
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** SD7930 (South Dakota)
- **Sole proprietor:** No
## Practice location
- **Address:** 501 SUMMIT ST, Yankton, SD 57078-3855
- **Phone:** (605) 668-8100
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 5 organizations under Medicare reassignment (form CMS-855R): Sacred Heart Health Services (NPI 1194228817, Yankton, SD); Avera Mckennan (NPI 1376519116, Tea, SD); Avera Queen Of Peace (NPI 1992466635, Mitchell, SD); Prairie Lakes Health Care System Inc (NPI 1396525143, Watertown, SD); Avera Medical Group Webster (NPI 1588978423, Webster, SD) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Nebraska College Of Medicine, class of 2005
## Record status
- **NPPES last updated:** December 27, 2017
- **Other identifiers:** Medicaid 10025121700 (NE); Medicaid 10024995100 (NE)
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Source: [NPI Profile](https://npiprofile.com/npi/1811198278) · Data from the CMS NPPES public registry.