MARK ELDON BONTREGER PSYCHOLOGIST
NPI 1861505190
Psychologist - Clinical in Watertown, SD
About Mark Eldon Bontreger Psychologist NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARK ELDON BONTREGER PSYCHOLOGIST (NPI 1861505190) is an individual clinical provider in Watertown, South Dakota, licensed in South Dakota (364) and active in the NPI registry since August 2006. He is enrolled in Medicare PECOS and is a graduate of Other (1995).
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
Mark Eldon Bontreger Psychologist 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 Reassignment
Medicare enrollment records show Mark Bontreger reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Watertown, SD 57201
- Reassigned Medicare billing, South Dakota enrollment
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
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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 57201 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 5
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
WATERTOWN, SD 57201
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 Mark Bontreger's NPI number?
The NPI number for Mark Bontreger is 1861505190. It was assigned to this individual provider in the NPPES registry on August 17, 2006.
Where is Mark Bontreger located?
Mark Bontreger practices at 525 5th St SE Suite L-13, Watertown, SD 57201. The listed phone number is (605) 882-0800.
What is Mark Bontreger's specialty?
The primary specialty registered for this NPI is Psychologist, specializing in Clinical, with taxonomy code 103TC0700X.
Is Mark Bontreger enrolled in Medicare?
Yes. Mark Bontreger 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 organization bills Medicare for Mark Bontreger's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Bontreger reassigns Medicare benefits to Mark Bontreger Inc (Watertown, SD). The 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 Mark Bontreger's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mark Bontreger accept?
Health plans from Sanford Health Plan and Wellmark of South Dakota, Inc. list Mark Bontreger 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.
When was this NPI record last updated?
The NPPES record for Mark Bontreger was last updated on November 2, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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.
# Mark Eldon Bontreger, PSYCHOLOGIST · NPI 1861505190
Clinical provider in Watertown, South Dakota. Individual provider, active in the CMS NPPES registry since August 17, 2006.
## Identity
- **NPI:** 1861505190 (Entity type: Individual)
- **Enumerated:** August 17, 2006
- **Primary specialty:** Psychologist - Clinical · taxonomy 103TC0700X
- **State license:** 364 (South Dakota)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 525 5TH ST SE, SUITE L-13, Watertown, SD 57201-4940
- **Phone:** (605) 882-0800 · **Fax:** (605) 882-0861
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment
- **Bills Medicare through:** Mark Bontreger Inc (NPI 1942496047, Watertown, SD), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1995
## Record status
- **NPPES last updated:** November 2, 2007
- **Other identifiers:** Medicaid 6551792 (SD); Medicare PIN S40196 (SD)
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Source: [NPI Profile](https://npiprofile.com/npi/1861505190) · Data from the CMS NPPES public registry.