Margaret Johnstone, RN NP
NPI 1134229347 · Psychiatric/Mental Health Nurse Practitioner · Concord, CA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Margaret Johnstone, RN NP is a Psychiatric/Mental Health Nurse Practitioner provider in Concord, CA (NPI 1134229347).
Provider details
- NPI number
- 1134229347
- Entity type
- Individual
- Primary specialty
- Psychiatric/Mental Health Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- RN NP
- Sex
- Female
- Sole proprietor
- No
- License
- 14501 (CA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 2 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Buspirone Hcl | 13 |
| Escitalopram Oxalate | 11 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-09-25
- Last updated
- 2013-04-30
Frequently asked questions
- What is Margaret Johnstone's NPI number?
- Margaret Johnstone's National Provider Identifier (NPI) is 1134229347, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Margaret Johnstone's specialty?
- Margaret Johnstone is listed in the NPPES registry with a primary specialty of Psychiatric/Mental Health Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Margaret Johnstone located?
- Margaret Johnstone's practice location on file with NPPES is 2740 Grant St, Concord, CA 94520-2265.
- What is Margaret Johnstone's phone number?
- The practice phone number listed in the NPPES registry for Margaret Johnstone is (925) 285-5431.
- Does Margaret Johnstone accept Medicare?
- Margaret Johnstone is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Margaret Johnstone's NPI active?
- Yes — Margaret Johnstone's NPI (1134229347) is active in the NPPES registry as of the last update on 2013-04-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.