MARGARET MUTHONI NGUMI FNP-C PMHNP-BC
NPI 1558701458
Nurse Practitioner - Psychiatric/Mental Health in Olympia, WA
About Margaret Muthoni Ngumi Fnp-c Pmhnp-bc NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARGARET MUTHONI NGUMI FNP-C PMHNP-BC (NPI 1558701458) is an individual psychiatric/mental health provider in Olympia, Washington, licensed in Georgia (RN203586) and active in the NPI registry since June 2013. She is enrolled in Medicare PECOS and is a graduate of Other (2022).
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
Margaret Muthoni Ngumi Fnp-c Pmhnp-bc 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
3Medicare enrollment records show Margaret Ngumi reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Rome, GA 30165
- Reassigned Medicare billing, Georgia enrollment
- Medicare enrollment name: Floyd Physicians LLC
- 185 clinicians in this Medicare group
Cartersville, GA 30121
- Reassigned Medicare billing, Georgia enrollment
- 3,885 clinicians in this Medicare group
Jacksonville, FL 32207
- Reassigned Medicare billing, Georgia enrollment
- 66 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 98501 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 13
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
OLYMPIA, WA 98501
OLYMPIA, WA 98501
OLYMPIA, WA 98501
OLYMPIA, WA 98501
OLYMPIA, WA 98501
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 Margaret Ngumi's NPI number?
The NPI number for Margaret Ngumi is 1558701458. It was assigned to this individual provider in the NPPES registry on June 25, 2013.
Where is Margaret Ngumi located?
Margaret Ngumi practices at 400 Union Ave SE Ste 200, Olympia, WA 98501. The listed phone number is (833) 351-8255.
What is Margaret Ngumi's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Psychiatric/Mental Health, with taxonomy code 363LP0808X.
Is Margaret Ngumi enrolled in Medicare?
Yes. Margaret Ngumi 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 Margaret Ngumi's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Margaret Ngumi reassigns Medicare benefits to 3 organizations: Floyd Healthcare Management Inc (Rome, GA), Wellstar Medical Group, LLC (Cartersville, GA) and Mccd Fl Psychiatry Services PA (Jacksonville, FL). 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 Margaret Ngumi's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Margaret Ngumi accept?
Health plans from Cigna HealthCare of Arizona, Inc, Oscar Health, Oscar Insurance Company and UnitedHealthcare list Margaret Ngumi 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.
When was this NPI record last updated?
The NPPES record for Margaret Ngumi was last updated on August 1, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.
# Margaret Muthoni Ngumi, FNP-C PMHNP-BC · NPI 1558701458
Psychiatric/Mental Health physician in Olympia, Washington. Individual provider, active in the CMS NPPES registry since June 25, 2013.
## Identity
- **NPI:** 1558701458 (Entity type: Individual)
- **Enumerated:** June 25, 2013
- **Primary specialty:** Nurse Practitioner - Psychiatric/Mental Health · taxonomy 363LP0808X
- **State license:** RN203586 (Georgia)
- **Sole proprietor:** No
## Practice location
- **Address:** 400 UNION AVE SE STE 200, Olympia, WA 98501-2060
- **Phone:** (833) 351-8255 · **Fax:** (770) 704-2765
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Floyd Healthcare Management Inc (NPI 1154377166, Rome, GA); Wellstar Medical Group, LLC (NPI 1588059653, Cartersville, GA); Mccd Fl Psychiatry Services PA (NPI 1659003457, Jacksonville, FL) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2022
## Record status
- **NPPES last updated:** August 1, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1558701458) · Data from the CMS NPPES public registry.