KARL S DEMARCO MD
NPI 1205483781
Family Medicine in Tyndall, SD
About Karl S Demarco Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
KARL S DEMARCO MD (NPI 1205483781) is an individual family medicine provider in Tyndall, South Dakota, licensed in South Dakota (13975) and active in the NPI registry since August 2019. He is enrolled in Medicare PECOS, is affiliated with Avera Sacred Heart Hospital, and is a graduate of Other (2019).
NPPES Registry Identity
Specialties & Licenses
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
Karl S Demarco 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 Reassignment
Medicare enrollment records show Karl Demarco reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Tyndall, SD 57066
- Reassigned Medicare billing, South Dakota enrollment
- Also billed through NPI 1730123522 (South Dakota)
- 4 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.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Avera Sacred Heart Hospital
Acute Care Hospitals · Yankton, SDSt Michael's Hospital - Cah
Critical Access Hospitals · Tyndall, SDPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 57066 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.
TYNDALL, SD 57066
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 Karl Demarco's NPI number?
The NPI number for Karl Demarco is 1205483781. It was assigned to this individual provider in the NPPES registry on August 20, 2019.
Where is Karl Demarco located?
Karl Demarco practices at 410 W 16th Ave, Tyndall, SD 57066. The listed phone number is (605) 589-2100.
What is Karl Demarco's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is Karl Demarco enrolled in Medicare?
Yes. Karl Demarco 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 Karl Demarco's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Karl Demarco reassigns Medicare benefits to St. Michael's Hospital, Inc. (Tyndall, 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 Karl Demarco's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Karl Demarco accept?
Health plans from Ambetter Health, Ambetter Health of Delaware, Ambetter from Sunflower Health Plan, Avera Health Plans and Oscar Insurance Company and 2 other insurers list Karl Demarco 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 Karl Demarco affiliated with any hospitals?
According to CMS data, Karl Demarco is affiliated with Avera Sacred Heart Hospital and St Michael's Hospital - Cah.
When was this NPI record last updated?
The NPPES record for Karl Demarco was last updated on September 12, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.