MARK TWAIN MEDICAL CENTER
NPI 1508968819
General Acute Care Hospital - Critical Access in San Andreas, CA
About Mark Twain Medical Center NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARK TWAIN MEDICAL CENTER (NPI 1508968819) is a healthcare organization registered as a critical access in San Andreas, California and active in the NPI registry since September 2006. The organization lists John Chivers, Chief Financial Officer, as its authorized official.
NPPES Registry Identity
Specialties & Licenses 2
Other Identifiers 5
Medicare Participation & PECOS CMS
Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Mark Twain Medical Center is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
39Medicare enrollment records show 39 clinicians reassign Medicare billing to Mark Twain Medical Center, which bills Medicare for the services they deliver. Of these, 5 practice within 10 miles. Listed here are the 20 practicing nearest to this location.
Clinicians by Medicare Specialty 16
Nearest to this location (20)
See all 39Stockton, CA 95204
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Hospital Quality Ratings CMS Care Compare
Quality and patient-experience ratings for Mark Twain Medical Center (CMS certification number 051332), from CMS Care Compare.
Mark Twain Medical Center
Critical Access Hospitals · San Andreas, CAPatient Experience
HCAHPS patient survey · Jan 2023 – Dec 2023Complications & Deaths 6
Unplanned Hospital Visits 13
Timely & Effective Care 15
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Mark Twain Medical Center's NPI number?
The NPI number for Mark Twain Medical Center is 1508968819. It was assigned to this organization in the NPPES registry on September 5, 2006.
Where is Mark Twain Medical Center located?
Mark Twain Medical Center is located at 768 Mountain Ranch Rd, San Andreas, CA 95249. The listed phone number is (209) 754-3521.
What is Mark Twain Medical Center's specialty?
The primary specialty registered for this NPI is General Acute Care Hospital, specializing in Critical Access, with taxonomy code 282NC0060X.
Is Mark Twain Medical Center enrolled in Medicare?
Yes. Mark Twain Medical Center is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through Mark Twain Medical Center?
According to the CMS Revalidation Reassignment List (October 2026 release), 39 clinicians in 16 Medicare specialties reassign their Medicare billing to Mark Twain Medical Center. A reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for the clinician's services. The largest specialties are Family Practice (7), Hematology/Oncology (5) and Nurse Practitioner (5). Of these, 5 practice within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Is Mark Twain Medical Center a Medicare-certified hospital?
Yes. Mark Twain Medical Center is a Medicare-certified hospital (Critical Access Hospitals).
What quality rating does Mark Twain Medical Center have?
CMS rates Mark Twain Medical Center 3 out of 5 stars overall on Care Compare, based on measures of safety, patient experience and outcomes. The full measure detail is in the Hospital Quality Ratings section above.
When was this NPI record last updated?
The NPPES record for Mark Twain Medical Center was last updated on April 15, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Mark Twain Medical Center · NPI 1508968819
Critical Access organization in San Andreas, California. Organization record, active in the CMS NPPES registry since September 5, 2006.
## Identity
- **NPI:** 1508968819 (Entity type: Organization)
- **Enumerated:** September 5, 2006
- **Primary specialty:** General Acute Care Hospital - Critical Access · taxonomy 282NC0060X
- **Organization subpart:** No
- **Authorized official:** John Chivers, CHIEF FINANCIAL OFFICER
## Practice location
- **Address:** 768 MOUNTAIN RANCH RD, San Andreas, CA 95249-9707
- **Phone:** (209) 754-3521 · **Fax:** (209) 754-2675
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Clinicians billing through this organization:** 39 clinicians in 16 Medicare specialties reassign Medicare billing to this organization (form CMS-855R); largest: Family Practice (7), Hematology/Oncology (5), Nurse Practitioner (5); 5 practice within 10 miles; [full list](https://npiprofile.com/npi/1508968819/clinicians) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** April 15, 2021
- **Other identifiers:** Medicaid LTC30366G (CA); Other ZZZC0502Z; Medicaid HSP40366G (CA); and 2 more
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Source: [NPI Profile](https://npiprofile.com/npi/1508968819) · Data from the CMS NPPES public registry.