Keaghan Ottenbaker, DO

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

• Spectrum Health Hospital · Grand Rapids, MI · listed as Spectrum Health Hospital
• Spectrum Health United Hospital Hospital · Greenville, MI · listed as Spectrum Health Hospital

Colleagues at Spectrum Health Primary Care Partners

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 2303 clinicians in the practice; 12 are shown here.

• Krystal Jill Auernhamer, PA Medical Physician Assistant · Kentwood, MI
• Anna Kristine Brown, PA-C Physician Assistant · Grand Rapids, MI
• Dr. Matthew Francis Hirschfeld, MD Anesthesiology Physician · Oklahoma City, OK
• Rebecca Hoedema, MD Colon & Rectal Surgery Physician · Grand Rapids, MI
• Robert Matthew Kuzel, MD Anesthesiology Physician · Dearborn, MI
• Mr. Michael Jon Lyons, PA Physician Assistant · Grand Rapids, MI
• Gable Bert Moffitt, MD Orthopaedic Surgery Physician · Grand Rapids, MI
• Stephen Rivard, DO Internal Medicine Physician · Grand Rapids, MI
• Jedidiah John Schuyten, PAC Physician Assistant · Greenville, MI
• Dr. Nikko Thomas Sirdenis, MC Internal Medicine Physician · Grand Rapids, MI
• Travis James Tomaszewski, DO Internal Medicine Physician · Grand Rapids, MI
• Arjun Varadarajan, MD Student in an Organized Health Care Education/Training Program · New Orleans, LA

Other providers in Ada

• Dr. Lawrence G. Foe, MD

  Individual Family Medicine Physician · NPI 1689678401

  7128 Fulton St E, Ada, MI 49301-8413 · (616) 825-3530

• Guy J Garrett, DO

  Individual Family Medicine Physician · NPI 1942264304

  6181 Witherbee Dr SE, Ada, MI 49301-7810 · (616) 676-3207

• Junwen Law, MD

  Individual Family Medicine Physician · NPI 1275945842

  7128 Fulton St E, Ada, MI 49301-8413 · (616) 825-3530

• Lauren Phillips Michelli, MD

  Individual Family Medicine Physician · NPI 1285046086

  7128 Fulton St E, Ada, MI 49301-8413 · (616) 825-3530

• Spectrum Health Primary Care Partners

  Organization Family Medicine Physician · NPI 1437673712

  7128 Fulton St E, Ada, MI 49301-8436 · (616) 825-3500