Karen Chang, DO - Medicare Internal Medicine in Rialto, CA

Karen Chang, DO is a medicare enrolled "Internal Medicine - Gastroenterology" physician in Rialto, California. Her current practice location is 2006 N Riverside Ave Ste B, Rialto, California. You can reach out to her office (for appointments etc.) via phone at (909) 644-4035.

Karen Chang is licensed to practice in California (license number 20A16468) and she also participates in the medicare program. She does not accept medicare assignments directly but she may accept medicare through third-party (refer to Reassignment section below) and may also prescribe medicare part D drugs. Her NPI Number is 1861855439.

Contact Information

Karen Chang, DO
2006 N Riverside Ave Ste B,
Rialto, CA 92377-4697
(909) 644-4035
(909) 881-0668

Map and Direction




Physician's Profile

Full NameKaren Chang
GenderFemale
SpecialityInternal Medicine - Gastroenterology
Location2006 N Riverside Ave Ste B, Rialto, California
Accepts Medicare AssignmentsMedicare enrolled and may accept medicare through third-party reassignment. May prescribe medicare part D drugs.
  NPI Data:
  • NPI Number: 1861855439
  • Provider Enumeration Date: 03/31/2016
  • Last Update Date: 01/18/2024
  Medicare PECOS Information:
  • PECOS PAC ID: 6204257462
  • Enrollment ID: I20200527000683

Medical Identifiers

Medical identifiers for Karen Chang such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1861855439NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207RG0100XInternal Medicine - Gastroenterology 20A16468 (California)Primary

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Karen Chang allows following entities to bill medicare on her behalf.
Entity NameSan Bernardino Gastroenterology Associates Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1265982375
PECOS PAC ID: 7214218726
Enrollment ID: O20161221000716

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Karen Chang is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Karen Chang, DO
2006 N Riverside Ave Ste B,
Rialto, CA 92377-4697

Ph: () -
Karen Chang, DO
2006 N Riverside Ave Ste B,
Rialto, CA 92377-4697

Ph: (909) 644-4035

Reviews and Comments


Internal Medicine Doctors in Rialto, CA

Dr. Rogelio Tan Toh, M.D.
Gastroenterology
Medicare: Not Enrolled in Medicare
Practice Location: 1850 N Riverside Ave, Suite 240, Rialto, CA 92376
Phone: 909-421-2700    
Dr. Kumaravelu Balasubramaniam, MD
Gastroenterology
Medicare: Accepting Medicare Assignments
Practice Location: 2006 N Riverside Ave, Ste B, Rialto, CA 92377
Phone: 909-881-3032    Fax: 909-881-0668
Hedyeh Mohajerin Golshan, M.D.
Gastroenterology
Medicare: May Accept Medicare Assignments
Practice Location: 1850 N Riverside Ave, Suite 230, Rialto, CA 92376
Phone: 909-875-1199    Fax: 909-875-1166
Dr. Natasha Alexander, MD
Gastroenterology
Medicare: Medicare Enrolled
Practice Location: 1851 N Riverside Ave, Rialto, CA 92376
Phone: 909-874-2371    
Dr. Sun Chung Soung, M.D.
Gastroenterology
Medicare: Not Enrolled in Medicare
Practice Location: 1734 N Riverside Ave, Suite 2, Rialto, CA 92376
Phone: 909-875-3595    Fax: 909-875-1029
Dr. Victor Guharoy, MD
Gastroenterology
Medicare: Accepting Medicare Assignments
Practice Location: 2006 N Riverside Ave, Rialto, CA 92377
Phone: 909-644-4033    
Zeid K Kayali, M.D.
Gastroenterology
Medicare: Accepting Medicare Assignments
Practice Location: 2006 N Riverside Ave Ste A, Rialto, CA 92377
Phone: 909-883-2999    Fax: 909-883-2997

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

Our Data: Information on www.medicarelist.com is built using data sources published by Centers for Medicare & Medicaid Services (CMS) under Freedom of Information Act (FOIA). The information disclosed on the NPI Registry are FOIA-disclosable and are required to be disclosed under the FOIA and the eFOIA amendments to the FOIA. There is no way to 'opt out' or 'suppress' the NPPES record data for health care providers with active NPIs.