Marie Johnston, FNP-BC
Marie Johnston, FNP-BC is a Family Nurse Practitioner in Montclair, CA, registered under NPI 1528505377. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
The practice address on file is 9635 MONTE VISTA AVE STE 205, Montclair, CA 91763. We have not yet mapped what surrounds this office — parking, transit, and nearby pharmacies are added as our data collection reaches each location.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| 95004376 | CA | Family Nurse Practitioner primary |
This provider holds licence 95004376 issued in CA. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
- Status
- Approved
- Provider type
- Practitioner - Nurse Practitioner
- PAC ID
- 0547539330
Enrolled in Medicare 8 times, across 8 states:
| State | Enrollment ID | Provider type |
|---|---|---|
| California | I20170711001542 | Practitioner - Nurse Practitioner |
| New York | I20240328002541 | Practitioner - Nurse Practitioner |
| Texas | I20251018000449 | Practitioner - Nurse Practitioner |
| Arizona | I20251021004674 | Practitioner - Nurse Practitioner |
| Florida | I20251114001886 | Practitioner - Nurse Practitioner |
| Nevada | I20251114001939 | Practitioner - Nurse Practitioner |
| Virginia | I20260208000252 | Practitioner - Nurse Practitioner |
| Washington | I20260424002981 | Practitioner - Nurse Practitioner |
Medicare enrolment is recorded as approved under the provider type Practitioner - Nurse Practitioner. There are 8 separate enrolment records across 8 states (CA, NY, TX, AZ, FL, NV, VA, WA). Multiple enrolments usually mean the provider bills Medicare from more than one practice location, or has kept an earlier enrolment after moving. Each record carries its own enrolment ID, listed above. Being enrolled means the provider can bill Medicare; it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
What Family covers
Definition to come... NUCC Health Care Provider Taxonomy, code 363LF0000X
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1528505377 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jan 31, 2017 |
| Last updated | Aug 28, 2023 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Female |
| Credential | FNP-BC |
| Practice address |
9635 MONTE VISTA AVE STE 205 Montclair, CA 91763 (909) 449-9328 Fax (310) 362-0313 |
| Mailing address |
3895 BILBERRY RD San Bernardino, CA 92407 |
| Other names |
Marie Madamba Former Legal Business Name |
| Other identifiers |
95004376
· Other (CA) |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 5 | 2 | 8 | 5 | 0 | 5 | 3 | 7 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 5 | 4 | 8 | 1 | 0 | 1 | 3 | 5 |
Sum = 53 · next multiple of 10 = 60 · check digit = 7 · actual last digit = 7
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.