DIANA CATHERINE DIEMER FNP
NPI 1104313436
Family Medicine in Hastings, MI
About Diana Catherine Diemer Fnp NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DIANA CATHERINE DIEMER FNP (NPI 1104313436) is an individual family medicine provider in Hastings, Michigan, licensed in Michigan (4704272488) and active in the NPI registry since April 2018. She is enrolled in Medicare PECOS, is affiliated with Corewell Health Pennock Hospital, and is a graduate of Other (2018).
NPPES Registry Identity
Specialties & Licenses
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
Diana Catherine Diemer Fnp 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 Reassignment
Medicare enrollment records show Diana Diemer reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Hastings, MI 49058
- Reassigned Medicare billing, Michigan enrollment
- 5 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
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Corewell Health Pennock Hospital
Critical Access Hospitals · Hastings, MIPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 49058 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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 Diana Diemer's NPI number?
The NPI number for Diana Diemer is 1104313436. It was assigned to this individual provider in the NPPES registry on April 23, 2018.
Where is Diana Diemer located?
Diana Diemer practices at 1005 W Green St Ste 304, Hastings, MI 49058. The listed phone number is (269) 948-8057.
What is Diana Diemer's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is Diana Diemer enrolled in Medicare?
Yes. Diana Diemer 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 organization bills Medicare for Diana Diemer's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Diana Diemer reassigns Medicare benefits to Thornapple Valley Family Physicians PC (Hastings, MI). The 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 Diana Diemer's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Diana Diemer accept?
Health plans from Ambetter Health, Ambetter from Buckeye Health Plan and Ambetter from Meridian list Diana Diemer 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 Diana Diemer affiliated with any hospitals?
According to CMS data, Diana Diemer is affiliated with Corewell Health Pennock Hospital.
When was this NPI record last updated?
The NPPES record for Diana Diemer was last updated on April 23, 2018. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 years 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.
# Diana Catherine Diemer, FNP · NPI 1104313436
Family Medicine physician in Hastings, Michigan. Individual provider, active in the CMS NPPES registry since April 23, 2018.
## Identity
- **NPI:** 1104313436 (Entity type: Individual)
- **Enumerated:** April 23, 2018
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** 4704272488 (Michigan)
- **Sole proprietor:** No
## Practice location
- **Address:** 1005 W GREEN ST STE 304, Hastings, MI 49058-1725
- **Phone:** (269) 948-8057 · **Fax:** (269) 948-8964
## 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:** Thornapple Valley Family Physicians PC (NPI 1528268513, Hastings, MI), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2018
## Record status
- **NPPES last updated:** April 23, 2018
---
Source: [NPI Profile](https://npiprofile.com/npi/1104313436) · Data from the CMS NPPES public registry.