Quick answers
- Does Jennifer L. Castle accept Medicare assignment?
- Yes. Medicare's clinician data says Jennifer L. Castle 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 Jennifer L. Castle see?
- In 2024, CMS data shows 418 Original Medicare patients and 1,205 services for Jennifer L. Castle. This counts Original Medicare only and measures volume, not quality.
- What is Jennifer L. Castle's NPI number?
- 1871031302. 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 Jennifer L. Castle, 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 | 418 |
|---|---|
| Services billed to Medicare | 1,205 |
| Different services or procedures | 10 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's (G2211)485 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)292 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)248 services
- Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)127 services
- Prolonged office or other outpatient evaluation and management service(s) beyond the maximum required time of the primary procedure which has been selected using total time on the date of the primary service; each additional 15 minutes by the physician or (G2212)16 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).
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)75%
- High blood pressure74%
- High cholesterol70%
- Arthritis39%
- Diabetes28%
- Osteoporosis24%
Hospitals where Jennifer L. Castle works
Medicare's Facility Affiliation Data lists Jennifer L. Castle 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.
- Franklin General HospitalHampton, IA · Critical Access Hospital · Emergency services: listed by Medicare · CCN 161308
- Hancock County Health SystemBritt, IA · Critical Access Hospital · Emergency services: listed by Medicare · CCN 161307
- Kossuth Regional Health CenterAlgona, IA · Critical Access Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 161353
- MercyOne North Iowa Medical CenterMason City, IA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 160064
- Mitchell County Regional HealthOsage, IA · Critical Access Hospital · Medicare rating: 3 of 5 stars · Emergency services: not listed by Medicare · CCN 161323
Practice locations
Addresses where Jennifer L. Castle is enrolled with Medicare (CMS data updated October 2, 2026).
- 1000 4th St SWMason City, IA 50401
Group practices
Medicare enrollment lists Jennifer L. Castle as a member of this group (CMS data updated October 2, 2026).
- North Iowa Mercy Clinics302 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Mason City
Clinicians with the same Medicare primary specialty in Mason City, IA — not a recommendation.
Other clinicians in North Iowa Mercy Clinics
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Graduation year | 2016 |
|---|---|
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1871031302 |
| 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