NPPES file of Aug 9, 2026

Mark Twain Medical Center

Mark Twain Medical Center holds 6 active organization NPIs in the federal registry, with practice locations in 4 California cities. 5 list rural health clinic/center as their primary taxonomy; each location can bill under its own NPI.

CMS NPPES registry, file of Aug 9, 2026 · legal names grouped after punctuation and "LLC" are removed · method · Verify with CMS →

Which NPI is yours?

Search the organization with your city to find the NPI for the location you visit or bill.

Find a location's NPI

San Andreas has the most NPIs, 3

  1. San Andreas3
  2. Angels Camp1
  3. Arnold1
  4. Copperopolis1

Source: CMS NPPES monthly file of Aug 9, 2026, organization NPIs by practice city.

Most NPIs were issued in 2006 and 2008

Mark Twain Medical Center NPIs by year issued2006: 4, 2007: 0, 2008: 1, 2009: 0, 2010: 0, 2011: 0, 2012: 0, 2013: 0, 2014: 101234200620072008200920102011201220132014411
Mark Twain Medical Center NPIs by year issued2006: 4, 2007: 0, 2008: 1, 2009: 0, 2010: 0, 2011: 0, 2012: 0, 2013: 0, 2014: 101234200620072008200920102011201220132014411
Mark Twain Medical Center NPIs by year issued2006: 4, 2007: 0, 2008: 1, 2009: 0, 2010: 0, 2011: 0, 2012: 0, 2013: 0, 2014: 101234200620072008200920102011201220132014411

Source: CMS NPPES, enumeration dates.

4 NPIs were issued in 2006 alone, more than in any other year; none in 6 of the years between.

San Andreas locations

The city with the most Mark Twain Medical Center NPIs. The full list of all 6 follows.

NPILocationPrimary taxonomyIssued
1508968819768 MOUNTAIN RANCH RD, San AndreasCritical Access HospitalSep 5, 2006
1205002938704 MOUNTAIN RANCH RD, San AndreasRural Health Clinic/CenterMay 2, 2008
1255730545768 MOUNTAIN RANCH RD, San AndreasRural Health Clinic/CenterAug 22, 2014
All 6 locations, by city
NPILocationPrimary taxonomyIssued
1942362561590 STANISLAUS AVENUE, Angels CampRural Health Clinic/CenterDec 14, 2006
17908463012182 HIGHWAY 4 SUITE A-100, ArnoldRural Health Clinic/CenterDec 13, 2006
1588725196430 SAWMILL CREEK RD, CopperopolisRural Health Clinic/CenterDec 13, 2006
1508968819768 MOUNTAIN RANCH RD, San AndreasCritical Access HospitalSep 5, 2006
1205002938704 MOUNTAIN RANCH RD, San AndreasRural Health Clinic/CenterMay 2, 2008
1255730545768 MOUNTAIN RANCH RD, San AndreasRural Health Clinic/CenterAug 22, 2014

Checking an organization

  1. Match the NPI to the exact location you will visit or bill; each location can have its own.
  2. Confirm the business entity with the secretary of state.
  3. Check the HHS-OIG exclusion list for the organization and its owners.
  4. Verify each clinician you will see on their own record and with the state license search.

Common questions

Why does Mark Twain Medical Center have 6 NPIs?

An organization may obtain more than one Type 2 NPI, for example for separate locations or units that bill on their own. Mark Twain Medical Center's NPIs list practice locations in 4 cities.

Is an organization NPI a license?

No. An NPI identifies who bills. Facilities and the clinicians who work there are licensed separately by the state.

Source: CMS National Plan and Provider Enumeration System (NPPES), monthly file of Aug 9, 2026 (NPPES files on CMS.gov). An NPI identifies who bills; it is not a license.