MARK TWAIN MEDICAL CENTER
MARK TWAIN MEDICAL CENTER is an organization registered with the National Plan and Provider Enumeration System (NPPES) under NPI 1790846301, based in Arnold, CA. It is classified under Rural Health Clinic/Center.
Getting there
The practice address on file is 2182 HIGHWAY 4 SUITE A-100, Arnold, CA 95223. 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 |
|---|---|---|
| 030000058 | CA | Rural Health Clinic/Center primary |
This provider holds licence 030000058 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
- Part A Provider - Rural Health Clinic
- PAC ID
- 8820073711
- Enrollment ID
- O20100713000214
Medicare enrolment is recorded as approved under the provider type Part A Provider - Rural Health Clinic. 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 Rural Health covers
Definition to come... NUCC Health Care Provider Taxonomy, code 261QR1300X
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-2 identifies an organization — a clinic, hospital, group practice, laboratory, or supplier. Individual clinicians working there hold their own NPI-1 numbers separately, so a bill may reference both.
| NPI | 1790846301 valid check digit |
|---|---|
| Entity type | Organization (NPI-2) |
| Enumeration date | Dec 13, 2006 |
| Last updated | May 12, 2016 |
| Status | Active |
| Practice address |
2182 HIGHWAY 4 SUITE A-100 Arnold, CA 95223 (209) 795-4193 Fax (209) 795-0828 |
| Mailing address |
768 MOUNTAIN RANCH RD San Andreas, CA 95249 |
| Other identifiers |
RHM18573F
· Medicaid (CA) ZZZ61266Z · Other |
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 | 7 | 9 | 0 | 8 | 4 | 6 | 3 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 7 | 9 | 0 | 7 | 4 | 3 | 3 | 0 |
Sum = 59 · next multiple of 10 = 60 · check digit = 1 · actual last digit = 1
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.