Quick answers
- Does Marissa R. Hendriksen accept Medicare assignment?
- Yes. Medicare's clinician data says Marissa R. Hendriksen accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Marissa R. Hendriksen see?
- In 2024, CMS data shows 358 Original Medicare patients and 801 services for Marissa R. Hendriksen. This counts Original Medicare only and measures volume, not quality.
- What is Marissa R. Hendriksen's NPI number?
- 1245974690. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Marissa R. Hendriksen, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 358 |
|---|---|
| Services billed to Medicare | 801 |
| Different services or procedures | 55 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)259 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)86 services
- Automated urinalysis test (81003)52 services
- X-ray of chest, 2 views (71046)44 services
- Detection test by immunoassay technique for severe acute respiratory syndrome coronavirus and influenza (87428)42 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol74%
- High blood pressure67%
- Arthritis44%
- Depression28%
- Anxiety26%
- Diabetes24%
Hospitals where Marissa R. Hendriksen works
Medicare's Facility Affiliation Data lists Marissa R. Hendriksen at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Grinnell Regional Medical CenterGrinnell, IA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 160147
Practice locations
Addresses where Marissa R. Hendriksen is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 8; the Medicare profile lists all.
- 1152 SE Ashworth RdWaukee, IA 50263 (515) 264‑2200
- 202 4th Ave, Fl 2Grinnell, IA 50112 (641) 236‑2925
- 210 4th AveGrinnell, IA 50112 (641) 236‑7511
- 2103 Ingersoll AveDes Moines, IA 50312
- 2720 8th St SWAltoona, IA 50009 (515) 967‑0133
Group practices
Medicare enrollment lists Marissa R. Hendriksen as a member of these groups (CMS data updated October 2, 2026).
- Iowa Physicians Clinic Medical Foundation1,246 clinicians in the group
- Grinnell Regional Medical Center105 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Waukee
Clinicians with the same Medicare primary specialty in Waukee, IA — not a recommendation.
Other clinicians in Iowa Physicians Clinic Medical Foundation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| School | Des Moines University Of Osteopathic Medicine And Health Sciences |
|---|---|
| Graduation year | 2023 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1245974690 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians