MS. MARGARET A JOHNSTONE RN NP
NPI 1134229347
Nurse Practitioner - Psychiatric/Mental Health in Concord, CA
About Ms. Margaret A Johnstone Rn Np NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MS. MARGARET A JOHNSTONE RN NP (NPI 1134229347) is an individual psychiatric/mental health provider in Concord, California, licensed in California (14501) and active in the NPI registry since September 2006. She is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Ms. Margaret A Johnstone Rn Np is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Margaret Johnstone reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Walnut Creek, CA 94597
- Reassigned Medicare billing, California enrollment
- 650 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 94520 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 16
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
CONCORD, CA 94520
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 Johnstone's NPI number?
The NPI number for Margaret Johnstone is 1134229347. It was assigned to this individual provider in the NPPES registry on September 25, 2006.
Where is Margaret Johnstone located?
Margaret Johnstone practices at 2740 Grant St, Concord, CA 94520. The listed phone number is (925) 285-5431.
What is Margaret Johnstone's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Psychiatric/Mental Health, with taxonomy code 363LP0808X.
Is Margaret Johnstone enrolled in Medicare?
Yes. Margaret Johnstone is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Margaret Johnstone's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Margaret Johnstone reassigns Medicare benefits to John Muir Physician Network (Walnut Creek, CA). 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 Margaret Johnstone'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 Johnstone was last updated on April 30, 2013. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.
# Ms. Margaret A Johnstone, RN NP · NPI 1134229347
Psychiatric/Mental Health physician in Concord, California. Individual provider, active in the CMS NPPES registry since September 25, 2006.
## Identity
- **NPI:** 1134229347 (Entity type: Individual)
- **Enumerated:** September 25, 2006
- **Primary specialty:** Nurse Practitioner - Psychiatric/Mental Health · taxonomy 363LP0808X
- **State license:** 14501 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 2740 GRANT ST, Concord, CA 94520-2265
- **Phone:** (925) 285-5431 · **Fax:** (925) 847-5599
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** John Muir Physician Network (NPI 1841407665, Walnut Creek, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** April 30, 2013
- **Other identifiers:** Medicare UPIN 6694246 (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1134229347) · Data from the CMS NPPES public registry.