Medical Oncology in South Dakota
12 licensed medical oncologists practicing in South Dakota across 9 cities.
This page republishes public records from the federal NPI Registry, which every licensed U.S. healthcare provider is required to maintain. These are federal-agency records, not a directory we compile.
Source: NPI Registry · last checked
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NPI Registry records — Medical Oncology in South Dakota
7 of 12 shown have disclosed payments in CMS Open Payments (2024)
Showing 12 of 12 federal NPI records, alphabetical by last name. Contact details come directly from the NPI Registry — verify currency with the provider's office. Pharma / device payment disclosures from CMS Open Payments are shown where the physician appears in that federal database.
In 2023, $21 was disclosed to this physician across 1 transaction by pharmaceutical or medical-device companies.
Mostly gifts ($21).
In 2023, $32 was disclosed to this physician across 1 transaction by pharmaceutical or medical-device companies.
Mostly entertainment ($32).
David Lee Elson, MD
1000 E. 23rd St., Ste. 230
Sioux Falls, SD 57105 · (605) 322-6900
License: 2513 (SD)
In 2023, $15 was disclosed to this physician across 1 transaction by pharmaceutical or medical-device companies.
Mostly entertainment ($15).
In 2024, $1,331 was disclosed to this physician across 8 transactions by pharmaceutical or medical-device companies.
Mostly meals and beverages ($1,147) and entertainment ($184).
Largest single payer: Merck Sharp & Dohme LLC ($1,302).
Alexander James Johnson, MD
701 E Rosser Ave
Bismarck, ND 58501 · (701) 323-8550
License: 22378 (ND)
In 2024, $259 was disclosed to this physician across 11 transactions by pharmaceutical or medical-device companies.
Mostly entertainment ($259).
Largest single payer: NOVARTIS PHARMACEUTICALS CORPORATION ($96).
Bongi Ayaana Natalie Rudder, MD
200 1st St Sw
Rochester, MN 55905 · (507) 284-2511
License: 58669 (MN)
In 2024, $64 was disclosed to this physician across 3 transactions by pharmaceutical or medical-device companies.
Mostly gifts ($49) and entertainment ($15).
Largest single payer: Pfizer Inc. ($26).
Jonathan Robert Sande, MD
512 Skyline Blvd Ste 1
Cloquet, MN 55720 · (218) 879-4641
License: 36412 (MN)
Thomas B Tan, MD
400 Medical Plz Ste 100
Lake St Louis, MO 63367 · (636) 639-8600
License: 2020008924 (MO)
In 2023, $50 was disclosed to this physician across 2 transactions by pharmaceutical or medical-device companies.
Mostly entertainment ($50).
Payment totals shown for the latest published program year (2024). Presence of disclosed payments is not, on its own, a conflict of interest. Physicians dispute records directly with CMS (dispute process). How we show this.
Open Payments figures as displayed on . Corrections flow from the manufacturer through CMS and are adopted on our next refresh.
What this page is: a republication of public federal NPI Registry records, filtered to the medical oncology taxonomy. It is not a directory we curate, and inclusion is automatic based on each provider's own NPI filing with CMS. Providers who believe their NPI record is inaccurate should update it directly with CMS at npiregistry.cms.hhs.gov; our next refresh adopts the corrected federal record.
Practice info disclaimer: Provider addresses and phone numbers come from the NPI Registry, which providers update at their discretion. Always call ahead to confirm the provider is currently accepting patients and is at the listed address.
Medical disclaimer: This page is not a quality ranking and does not constitute medical advice or endorsement. Choose a provider in consultation with your primary care physician or care team.
Source: NPI Registry (taxonomy: Medical Oncology) · Last checked: 2026-04-20