O'BRIEN EILEEN MELLARS FNP
NPI 1174407621
Nurse Practitioner - Family in Cheyenne, WY
About O'brien Eileen Mellars Fnp NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
O'BRIEN EILEEN MELLARS FNP (NPI 1174407621) is an individual family provider in Cheyenne, Wyoming, licensed in Wyoming (50954) and active in the NPI registry since August 2025. She is enrolled in Medicare PECOS, is affiliated with Cheyenne Regional Medical Center, and is a graduate of Other (2023).
NPPES Registry Identity
Specialties & Licenses
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
O'brien Eileen Mellars 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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Cheyenne Regional Medical Center
Acute Care Hospitals · Cheyenne, WYPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 82009 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 20
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 O'brien Mellars's NPI number?
The NPI number for O'brien Mellars is 1174407621. It was assigned to this individual provider in the NPPES registry on August 5, 2025.
Where is O'brien Mellars located?
O'brien Mellars practices at 5050 Powderhouse Rd, Cheyenne, WY 82009. The listed phone number is (307) 634-1311.
What is O'brien Mellars's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.
Is O'brien Mellars enrolled in Medicare?
Yes. O'brien Mellars 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.
Is O'brien Mellars affiliated with any hospitals?
According to CMS data, O'brien Mellars is affiliated with Cheyenne Regional Medical Center.
When was this NPI record last updated?
The NPPES record for O'brien Mellars was last updated on March 31, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# O'brien Eileen Mellars, FNP · NPI 1174407621
Family physician in Cheyenne, Wyoming. Individual provider, active in the CMS NPPES registry since August 5, 2025.
## Identity
- **NPI:** 1174407621 (Entity type: Individual)
- **Enumerated:** August 5, 2025
- **Primary specialty:** Nurse Practitioner - Family · taxonomy 363LF0000X
- **State license:** 50954 (Wyoming)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 5050 POWDERHOUSE RD, Cheyenne, WY 82009-4800
- **Phone:** (307) 634-1311 · **Fax:** (307) 432-7546
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Medical school:** Other, class of 2023
## Record status
- **NPPES last updated:** March 31, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1174407621) · Data from the CMS NPPES public registry.