MRS. CLANCY JOYCE HARTMAN FNP-C
NPI 1235818535
Nurse Practitioner - Family in Lewistown, MT
About Mrs. Clancy Joyce Hartman Fnp-c NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MRS. CLANCY JOYCE HARTMAN FNP-C (NPI 1235818535) is an individual family provider in Lewistown, Montana, licensed in Montana (217113) and active in the NPI registry since July 2023. She is enrolled in Medicare PECOS, is affiliated with Billings Clinic, and maintains a secondary practice location in Lewistown.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
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
Mrs. Clancy Joyce Hartman 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 Reassignment
Medicare enrollment records show Clancy Hartman reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Lewistown, MT 59457
- Reassigned Medicare billing, Montana enrollment
- 82 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.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Billings Clinic
Acute Care Hospitals · Billings, MTCentral Montana Medical Center
Critical Access Hospitals · Lewistown, MTPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 59457 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 11
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
LEWISTOWN, MT 59457
LEWISTOWN, MT 59457
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 Clancy Hartman's NPI number?
The NPI number for Clancy Hartman is 1235818535. It was assigned to this individual provider in the NPPES registry on July 13, 2023.
Where is Clancy Hartman located?
Clancy Hartman practices at 311 W Main St, Lewistown, MT 59457. The listed phone number is (406) 535-6545.
What is Clancy Hartman's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.
Is Clancy Hartman enrolled in Medicare?
Yes. Clancy Hartman 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 Clancy Hartman's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Clancy Hartman reassigns Medicare benefits to Bighorn Valley Health Center Incorporated (Lewistown, MT). 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 Clancy Hartman's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Clancy Hartman accept?
Health plans from Blue Cross and Blue Shield of Montana, Mountain Health CO-OP, PacificSource Health Plans and Providence Health Plan list Clancy Hartman 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 Clancy Hartman affiliated with any hospitals?
According to CMS data, Clancy Hartman is affiliated with Billings Clinic and Central Montana Medical Center.
When was this NPI record last updated?
The NPPES record for Clancy Hartman was last updated on December 5, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 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.
# Mrs. Clancy Joyce Hartman, FNP-C · NPI 1235818535
Family physician in Lewistown, Montana. Individual provider, active in the CMS NPPES registry since July 13, 2023.
## Identity
- **NPI:** 1235818535 (Entity type: Individual)
- **Enumerated:** July 13, 2023
- **Primary specialty:** Nurse Practitioner - Family · taxonomy 363LF0000X
- **State license:** 217113 (Montana)
- **Sole proprietor:** No
## Practice location
- **Address:** 311 W MAIN ST, Lewistown, MT 59457-2760
- **Phone:** (406) 535-6545
## 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:** Bighorn Valley Health Center Incorporated (NPI 1942450432, Lewistown, MT), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2023
## Record status
- **NPPES last updated:** December 5, 2025
---
Source: [NPI Profile](https://npiprofile.com/npi/1235818535) · Data from the CMS NPPES public registry.