Dr James Cs Hahn, MD - Medicare Internal Medicine in Los Angeles, CA

Dr James Cs Hahn, MD is a medicare enrolled "Internal Medicine" physician in Los Angeles, California. He graduated from medical school in 1975 and has 49 years of diverse experience with area of expertise as Internal Medicine. His current practice location is 1245 Wilshire Blvd, Suite 790, Los Angeles, California. You can reach out to his office (for appointments etc.) via phone at (323) 735-1111.

Dr James Cs Hahn is licensed to practice in California (license number A36933) and he also participates in the medicare program. He accepts medicare assignments (which means he accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and his NPI Number is 1033293634.

Contact Information

Dr James Cs Hahn, MD
1245 Wilshire Blvd, Suite 790,
Los Angeles, CA 90017-4810
(323) 735-1111
(323) 735-3306

Map and Direction




Physician's Profile

Full NameDr James Cs Hahn
GenderMale
SpecialityInternal Medicine
Experience49 Years
Location1245 Wilshire Blvd, Los Angeles, California
Accepts Medicare AssignmentsYes. He accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Dr James Cs Hahn graduated from medical school in 1975
  NPI Data:
  • NPI Number: 1033293634
  • Provider Enumeration Date: 10/24/2006
  • Last Update Date: 10/11/2023
  Medicare PECOS Information:
  • PECOS PAC ID: 4587822382
  • Enrollment ID: I20120224000663

Medical Identifiers

Medical identifiers for Dr James Cs Hahn such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1033293634NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207R00000XInternal Medicine A36933 (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. Dr James Cs Hahn allows following entities to bill medicare on his behalf.
Entity NameJames Cs Hahn, Md Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1023893435
PECOS PAC ID: 8628415197
Enrollment ID: O20240319003375

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. Dr James Cs Hahn 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
Dr James Cs Hahn, MD
1245 Wilshire Blvd, Suite 790,
Los Angeles, CA 90017-4810

Ph: (323) 735-1111
Dr James Cs Hahn, MD
1245 Wilshire Blvd, Suite 790,
Los Angeles, CA 90017-4810

Ph: (323) 735-1111

Reviews and Comments


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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.