MARGARET MAINA DNP, CRNP, FNP-BC
NPI 1881574820
Nurse Practitioner in Walnut Creek, CA
About Margaret Maina Dnp, Crnp, Fnp-bc NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARGARET MAINA DNP, CRNP, FNP-BC (NPI 1881574820) is an individual nurse practitioner in Walnut Creek, California, licensed in California (95040723) and active in the NPI registry since September 2025. She is enrolled in Medicare PECOS and is a graduate of Other (2024).
NPPES Registry Identity
Specialties & Licenses 2
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 Maina Dnp, Crnp, Fnp-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
4Medicare enrollment records show Margaret Maina reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Walnut Creek, CA 94595
- Reassigned Medicare billing, California enrollment
- 15 clinicians in this Medicare group
El Segundo, CA 90245
- Reassigned Medicare billing, California enrollment
- 56 clinicians in this Medicare group
Lakewood, WA 98499
- Reassigned Medicare billing, Washington enrollment
- 15 clinicians in this Medicare group
Baltimore, MD 21209
- Reassigned Medicare billing, Maryland enrollment
- 8 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94595 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 12
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
WALNUT CREEK, CA 94595
WALNUT CREEK, CA 94595
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 Maina's NPI number?
The NPI number for Margaret Maina is 1881574820. It was assigned to this individual provider in the NPPES registry on September 2, 2025.
Where is Margaret Maina located?
Margaret Maina practices at 1226 Rossmoor Pkwy, Walnut Creek, CA 94595. The listed phone number is (801) 215-9309.
What is Margaret Maina's specialty?
The primary specialty registered for this NPI is Nurse Practitioner with taxonomy code 363L00000X.
Is Margaret Maina enrolled in Medicare?
Yes. Margaret Maina 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 Maina's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Margaret Maina reassigns Medicare benefits to 4 organizations: Post Acute Rehabilitation Doctors PC (Walnut Creek, CA), Greater Good Health PC, Inc. (El Segundo, CA), Mso Washington, Inc. (Lakewood, WA) and Endeavour Healthcare LLC (Baltimore, MD). 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 Maina's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Margaret Maina was last updated on August 12, 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.
# Margaret Maina, DNP, CRNP, FNP-BC · NPI 1881574820
Nurse Practitioner physician in Walnut Creek, California. Individual provider, active in the CMS NPPES registry since September 2, 2025.
## Identity
- **NPI:** 1881574820 (Entity type: Individual)
- **Enumerated:** September 2, 2025
- **Primary specialty:** Nurse Practitioner · taxonomy 363L00000X
- **State license:** 95040723 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 1226 ROSSMOOR PKWY, Walnut Creek, CA 94595-2538
- **Phone:** (801) 215-9309
## 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:** 4 organizations under Medicare reassignment (form CMS-855R): Post Acute Rehabilitation Doctors PC (NPI 1164156931, Walnut Creek, CA); Greater Good Health PC, Inc. (NPI 1821673005, El Segundo, CA); Mso Washington, Inc. (NPI 1891116109, Lakewood, WA); Endeavour Healthcare LLC (NPI 1285422154, Baltimore, MD) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2024
## Record status
- **NPPES last updated:** August 12, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1881574820) · Data from the CMS NPPES public registry.