Dr. Gigi Qiqi Chen, MD

Dr. Chen practices at Concord Medical Center in Concord, California, part of John Muir Health.

Dr. Chen's NPI, 1821073636, was assigned on December 14, 2005. Dr. Chen graduated from UC Irvine School of Medicine in 2002. Dr. Chen holds California license A84387.

Dr. Chen's primary practice is Concord Medical Center, at 2540 East St, Concord, CA 94520 in Contra Costa County. The practice phone is (925) 682-8200.

Dr. Chen's primary practice is Concord Medical Center in Concord, California, part of John Muir Health. Dr. Chen is also affiliated with John Muir Medical Center, Walnut Creek. The medical group on file is John Muir Health. Dmand AI also links Dr. Chen to 1 more hospital, 3 group practices and clinics, 2 medical groups and 1 home health agency, each named with a free account.

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chen practices, 7 sites in all. Vendor and product names are available with a free account.

Hematology and oncology is Dr. Chen's primary specialty in the NPI Registry, under taxonomy code 207RH0003X. Dr. Chen is board certified in hematology by the American Board of Internal Medicine. Dr. Chen is licensed in California.

Dmand AI lists breast cancer, chronic anemia, chronic leukemia, colorectal cancer, deep vein thrombosis (DVT), fluid and electrolyte imbalances, immune deficiency disease and lung cancer among the conditions Dr. Chen treats.

CMS data shows 23,125 Medicare services from Dr. Chen across 30 procedure codes in 2024, for 760 Medicare patients. Medicare paid $629,476 for them.

CMS counts 760 Medicare patients who saw Dr. Chen in 2024. The largest group is 75 to 84, with 329 patients. 75% of them have high cholesterol, and 72% have high blood pressure. 11% are also on Medicaid. Their average risk score is 1.90, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.

Across all payers, Dmand AI patient panel data puts Dr. Chen's median patient age at 73, with 66% women.

In 2024, Dr. Chen wrote 800 Medicare Part D claims for 218 patients. 76% of them were for generic drugs. CMS names the drug for 557 of them, across 22 drugs with 11 or more claims each, at $500,829 in total drug cost. In 2023, CMS named 258 claims across 12 drugs.

CMS publishes a Merit-based Incentive Payment System (MIPS) score of 90 out of 100 for Dr. Chen for performance year 2024, reported as part of a group. Dr. Chen accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Chen as offering telehealth.

Dmand AI links 1 paper to Dr. Chen in 2009. Dr. Chen's most frequent co-authors are Minh Tue Huynh, MD, Primo Nery Lara, MD and Derick Hon Man Lau, MD, PhD.

CMS Open Payments shows 834 general payments to Dr. Chen from 78 drug and device companies from 2016 to 2025. Consulting fees make up the largest share, 48% of the total. TESARO, Inc. paid the most, $45,058.

Dmand AI lists 1 award for Dr. Chen, most recently CMS Stage 1 EHR in 2014.

Dr. Chen graduated from UC Irvine School of Medicine in 2002. Dr. Chen is a member of ASCO.

Dr. Chen is in network with 13 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.