MARIBEL CASTELLANOS FNP-C
NPI 1861227860
Nurse Practitioner - Family in Jefferson, IA
About Maribel Castellanos Fnp-c NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARIBEL CASTELLANOS FNP-C (NPI 1861227860) is an individual family provider in Jefferson, Iowa, licensed in Iowa (A180209) and active in the NPI registry since September 2024. She is enrolled in Medicare PECOS, is affiliated with Greene County Medical Center, and is a graduate of Other (2024).
NPPES Registry Identity
Specialties & Licenses 2
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
Maribel Castellanos Fnp-c 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 Reassignments
7Medicare enrollment records show Maribel Castellanos reassigns Medicare billing to 7 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Jefferson, IA 50129
- Reassigned Medicare billing, Iowa enrollment
- 28 clinicians in this Medicare group
Madrid, IA 50156
- Reassigned Medicare billing, Iowa enrollment
- 9 clinicians in this Medicare group
Ogden, IA 50212
- Reassigned Medicare billing, Iowa enrollment
- Also billed through NPI 1942664602 (Iowa)
- 41 clinicians in this Medicare group
Boone, IA 50036
- Reassigned Medicare billing, Iowa enrollment
- 15 clinicians in this Medicare group
Ames, IA 50010
- Reassigned Medicare billing, Iowa enrollment
- 331 clinicians in this Medicare group
Novi, MI 48375
- Reassigned Medicare billing, Iowa enrollment
- 36 clinicians in this Medicare group
Novi, MI 48375
- Reassigned Medicare billing, Iowa enrollment
- 6 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.
Areas of Expertise CMS Part B claims
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Greene County Medical Center
Critical Access Hospitals · Jefferson, IABoone County Hospital
Critical Access Hospitals · Boone, IAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 50129 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 2
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Maribel Castellanos's NPI number?
The NPI number for Maribel Castellanos is 1861227860. It was assigned to this individual provider in the NPPES registry on September 9, 2024.
Where is Maribel Castellanos located?
Maribel Castellanos practices at 106 W Washington St Ste 2, Jefferson, IA 50129. The listed phone number is (515) 386-4192.
What is Maribel Castellanos's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.
Is Maribel Castellanos enrolled in Medicare?
Yes. Maribel Castellanos 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 organizations bill Medicare for Maribel Castellanos's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Maribel Castellanos reassigns Medicare benefits to 7 organizations: Greene County Medical Center (Jefferson, IA), Madrid Family Practice Clinic (Madrid, IA), Boone County Hospital (Ogden, IA), Boone County Family Medicine Tr (Boone, IA), Mcfarland Clinic PC (Ames, IA) and 2 more organizations, listed in the Medicare section above. Each 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 Maribel Castellanos's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Maribel Castellanos accept?
Health plans from Medica, Oscar Insurance Company and Wellmark Health Plan of Iowa, Inc. list Maribel Castellanos 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 Maribel Castellanos affiliated with any hospitals?
According to CMS data, Maribel Castellanos is affiliated with Greene County Medical Center and Boone County Hospital.
When was this NPI record last updated?
The NPPES record for Maribel Castellanos was last updated on August 25, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 months 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.
# Maribel Castellanos, FNP-C · NPI 1861227860
Family physician in Jefferson, Iowa. Individual provider, active in the CMS NPPES registry since September 9, 2024.
## Identity
- **NPI:** 1861227860 (Entity type: Individual)
- **Enumerated:** September 9, 2024
- **Primary specialty:** Nurse Practitioner - Family · taxonomy 363LF0000X
- **State license:** A180209 (Iowa)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 106 W WASHINGTON ST STE 2, Jefferson, IA 50129-1901
- **Phone:** (515) 386-4192
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 7 organizations under Medicare reassignment (form CMS-855R): Greene County Medical Center (NPI 1245260652, Jefferson, IA); Madrid Family Practice Clinic (NPI 1508882705, Madrid, IA); Boone County Hospital (NPI 1730503319, Ogden, IA); Boone County Family Medicine Tr (NPI 1033154836, Boone, IA); Mcfarland Clinic PC (NPI 1639135643, Ames, IA); and 2 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2024
## Record status
- **NPPES last updated:** August 25, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1861227860) · Data from the CMS NPPES public registry.