Melissa Johnston, PA-C
NPI 1578264982 · Physician Assistant · Orange, CA
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Melissa Johnston, PA-C is a Physician Assistant provider in Orange, CA (NPI 1578264982).
Provider details
- NPI number
- 1578264982
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA-C
- Sex
- Female
- Sole proprietor
- Yes
- License
- PA62285 (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 tenure33% of score
3 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 · 66 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 273 | 96 |
| Levothyroxine Sodium | 159 | 57 |
| Amlodipine Besylate | 154 | 57 |
| Metformin Hcl | 107 | 43 |
| Losartan Potassium | 105 | 34 |
| Omeprazole | 93 | 34 |
| Rosuvastatin Calcium |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$617 across 22 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2023-03-13
- Last updated
- 2024-11-14
- Certified
- 2024-11-14
Frequently asked questions
- What is Melissa Johnston's NPI number?
- Melissa Johnston's National Provider Identifier (NPI) is 1578264982, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Melissa Johnston's specialty?
- Melissa Johnston is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Melissa Johnston located?
- Melissa Johnston's practice location on file with NPPES is 1310 W Stewart Dr Ste 602, Orange, CA 92868-3857.
- What is Melissa Johnston's phone number?
- The practice phone number listed in the NPPES registry for Melissa Johnston is (714) 639-0414.
- Does Melissa Johnston accept Medicare?
- Melissa Johnston is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Melissa Johnston's NPI active?
- Yes — Melissa Johnston's NPI (1578264982) is active in the NPPES registry as of the last update on 2024-11-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.