James Pierre, MD, MPH
James Pierre, MD, MPH is an Addiction Medicine (Preventive Medicine) Physician in Simi Valley, CA, registered under NPI 1003194309. This provider registers 3 separate taxonomy codes, which usually means they practise across more than one recognised specialty. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
Here is what surrounds this office in Simi Valley, based on OpenStreetMap data collected Sep 10, 2026. Parking is available about 460 ft away. There is EV charging 0.24 mi from the office (Simi Valley Supercharger) — useful if you are driving in from out of town. The nearest transit stop is 0.40 mi away, served by Simi Valley Civic Center SE. If you arrive early, there is a coffee shop 0.35 mi away.
Getting here and what is nearby
Parking 237 ft ~1 min
Parking 265 ft ~2 min
Parking 460 ft ~2 min
EV charging Simi Valley Supercharger 0.24 mi ~5 min
Restaurant California Fish Grill 0.27 mi ~6 min
2920 Tapo Canyon Road, Simi Valley 93063
Mo-We,Su 11:00-21:00; Th-Sa 11:00-21:30
Restaurant Urbane Cafe 0.27 mi ~6 min
2920 Tapo Canyon Road, Simi Valley 93063
Mo-Sa 10:30-21:00; Sa 10:30-20:00
Restaurant TGI Fridays 0.28 mi ~6 min
2795 Tapo Canyon Road, Simi Valley 93063
Su-Th 11:00-24:00; Fr-Sa 11:00-02:00
Coffee It's Boba Time 0.34 mi ~7 min
2679 Tapo Canyon Road, Simi Valley 93063
Su-Th 09:30-22:30; Fr-Sa 09:30-23:00
Convenience 7-Eleven 0.34 mi ~7 min
Coffee Starbucks 0.35 mi ~7 min
Coffee Starbucks 0.35 mi ~7 min
2938 Tapo Canyon Road, Simi Valley 93063
Mo-Su 05:30-21:00
Grocery Vons 0.37 mi ~8 min
2938 Tapo Canyon Road, Simi Valley 93063
Mo-Su 05:30-24:00
Transit Simi Valley Civic Center SW 0.40 mi ~8 min
Transit Simi Valley Civic Center SE 0.40 mi ~8 min
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| C180637 | CA | Addiction Medicine (Preventive Medicine)… primary |
| 287401 | MA | Public Health & General Preventive… |
| 4301501025 | MI | General Practice Physician |
Licences are recorded in 3 states: CA, MA, MI. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
- Status
- Approved
- Provider type
- Practitioner - Addiction Medicine
- PAC ID
- 8729499223
- Enrollment ID
- I20221018002821
Medicare enrolment is recorded as approved under the provider type Practitioner - Addiction Medicine. 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.
Licensed in 3 states
This provider holds licences in 3 states: California, Massachusetts and Michigan. The practice address on file is in Simi Valley, CA, but a licence in another state usually means they see patients there too — either at a second location or by telehealth. If the address above is far from you, it is worth calling to ask whether they practise closer to where you live.
- Licence
- C180637
- Specialty
- Addiction Medicine (Preventive…
- Licence
- 287401
- Specialty
- Public Health & General Preventive…
Licence numbers are self-reported to NPPES at registration. They do not confirm a licence is currently active, in good standing, or valid for the specialty shown — only the state board can tell you that, which is why we link to each one.
What Addiction Medicine covers
A physician engaged in the subspecialty practice of Addiction Medicine who specializes in the prevention, evaluation, diagnosis, treatment, and recovery of persons with the disease of addiction. NUCC Health Care Provider Taxonomy, code 2083A0300X
All registered taxonomy codes
This provider registers 3 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 2083A0300X | Addiction Medicine (Preventive Medicine) Physician Addiction Medicine | C180637 | CA | primary |
| 2083P0901X | Public Health & General Preventive Medicine Physician Public Health & General Preventive Medicine | 287401 | MA | |
| 208D00000X | General Practice Physician | 4301501025 | MI |
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 | 1003194309 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Aug 3, 2011 |
| Last updated | Jan 19, 2023 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Male |
| Credential | MD, MPH |
| Practice address |
3855 ALAMO ST STE A Simi Valley, CA 93063 (504) 813-3864 |
| Mailing address |
8500 W SUNSET BLVD APT E509 West Hollywood, CA 90069 |
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 | 0 | 0 | 3 | 1 | 9 | 4 | 3 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 2 | 9 | 8 | 3 | 0 |
Sum = 51 · next multiple of 10 = 60 · check digit = 9 · actual last digit = 9
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.