Dr. Louis T. Chau, MD
- Medicare services, 2024
- 28
- Medicare patients, 2024
- 30
- Part D claims, 2024
- 126
- Hospital affiliations
- 2
- Medical group
- 1
- Practice address
- 9333 Imperial Highway, Downey, CA 90242
- Practice phone
- Call (562) 461-6007
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Chau's professional email, personal email and mobile number
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Dr. Louis T. Chau is an emergency medicine physician in Downey, California
Dr. Chau practices at Downey Medical Center in Downey, California, part of Kaiser Permanente.
Dr. Chau's NPI, 1225144918, was assigned on August 22, 2006. Dr. Chau graduated from UC Irvine School of Medicine in 1996. Dr. Chau's California license number on file is A64423.
- NPI
- 1225144918NPI Registry (opens in a new tab)
- NPI enumeration date
- August 22, 2006
- NPI status
- Active
- Practice phone
- (562) 461-6007
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Medical school graduation
- 1996
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Louis T. Chau practices at Downey Medical Center in Downey, California
Dr. Chau's primary practice is Downey Medical Center, at 9333 Imperial Highway, Downey, CA 90242 in Los Angeles County. The practice phone is (562) 461-6007.
- Downey Medical Center9333 Imperial Highway, Downey, CA 90242 · Los Angeles CountyPhone(562) 461-6007
Source: Dmand AI Affiliation Data
Dr. Louis T. Chau is affiliated with 3 sites of care and 1 medical group
Dr. Chau's primary practice is Downey Medical Center in Downey, California, part of Kaiser Permanente. Dr. Chau is also affiliated with Corona Regional Medical Center. The medical group on file is Southern California Permanente Medical Group. Dmand AI also links Dr. Chau to 1 more breast imaging center, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Louis T. Chau's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chau practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Downey Medical Center | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Louis T. Chau is one of 7,423 emergency medicine physicians in California
Emergency medicine is Dr. Chau's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. Chau is board certified in emergency medicine by the American Board of Emergency Medicine. Dr. Chau has a license on file in California.
Specialties and state licenses
- Emergency medicine, CaliforniaPrimary
Emergency medicine physicians near Dr. Chau
Counts of emergency medicine physicians with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Louis T. Chau billed Medicare for 28 services in 2024
CMS data shows 28 Medicare services from Dr. Chau across 1 procedure code in 2024, for 30 Medicare patients. Medicare paid $2,229 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Chau's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 112024: 28155%
Dr. Chau compared with the California median for emergency medicine physicians, 2024
- Dr. Chau
- California median
- Medicare services
- 28vs 26589% below
- Medicare patients
- 30vs 24388% below
- Part D claims
- 50vs 6219% below
Medians across 7,079 emergency medicine physicians in California with Dmand AI profiles that report each measure.
Dr. Chau's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Chau and other emergency medicine physicians in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Louis T. Chau treated 30 Medicare patients in 2024, average age 69
CMS counts 30 Medicare patients who saw Dr. Chau in 2024. The largest group is 65 to 74, with 13 patients. 73% of them have high blood pressure, and 60% have high cholesterol. Their average risk score is 1.82, 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. Chau's median patient age at 46, with 58% women.
Dr. Chau's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Chau's Medicare patients by sex, 2024
- Women1963%
- Men1137%
Chronic conditions among Dr. Chau's Medicare patients, 2024
- High blood pressure73%
- High cholesterol60%
- Diabetes50%
- Mood disorders43%
- Arthritis40%
- Chronic kidney disease40%
- Depression40%
Share of Medicare patients with each condition. A patient can have several.
Dr. Chau's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 46
Patient panel by sex, all payers
- Women58%
- Men42%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Louis T. Chau wrote 126 Medicare Part D claims in 2024
In 2024, Dr. Chau wrote 126 Medicare Part D claims for 101 patients. 89% of them were for generic drugs. CMS names the drug for 50 of them, across 3 drugs with 11 or more claims each, at $424 in total drug cost. In 2023, CMS named 32 claims across 2 drugs.
Dr. Chau's Part D claims by kind of drug, 2024
- Generic112 claims89%
- Brand-name14 claims11%
Dr. Chau's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Chau's Part D claims, 2024
- Opioids11%14 of 126 claims
- Antibiotics46%58 of 126 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 322024: 5056%
Drugs named by CMS: 3 in 2024, 2 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
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Dr. Louis T. Chau graduated from UC Irvine School of Medicine
Dr. Chau graduated from UC Irvine School of Medicine in 1996.
- Medical school
- Board certified in emergency medicine
Source: Dmand AI Professional Profile Data
Dr. Louis T. Chau accepts plans from 1 insurance carrier
Dr. Chau is in network with 1 carrier, including Kaiser Permanente. HMO plans come from the most carriers, 1. Check the plan with the practice before a visit.
- Kaiser Permanente
Source: Dmand AI Insurance Network Data
Sources for Dr. Louis T. Chau's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Louis T. Chau
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Louis T. Chau's NPI number?
Dr. Louis T. Chau's NPI number is 1225144918. It was assigned on August 22, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Louis T. Chau?
Dr. Louis T. Chau is an emergency medicine physician in Downey, California. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Louis T. Chau practice?
Dr. Chau practices at 9333 Imperial Highway, Downey, CA 90242. Dr. Chau's primary practice is Downey Medical Center in Downey, California, part of Kaiser Permanente. Dmand AI also links Dr. Chau to 1 breast imaging center.
What is Dr. Louis T. Chau's office phone number?
The practice phone on file for Dr. Chau is (562) 461-6007.
What is Dr. Louis T. Chau's medical license number?
Dr. Chau's California license number on file is A64423.
Which hospitals is Dr. Louis T. Chau affiliated with?
Dr. Chau practices at Downey Medical Center in Downey, California. Dr. Chau is also affiliated with Corona Regional Medical Center.
What medical group is Dr. Louis T. Chau part of?
Dr. Chau is linked to Southern California Permanente Medical Group.
Does Dr. Louis T. Chau accept Medicare?
Yes. CMS data shows Dr. Chau billed Medicare for 28 services in 2024.
How many Medicare patients does Dr. Louis T. Chau see?
CMS counts 30 Medicare patients who saw Dr. Chau in 2024, with an average age of 69.
Is Dr. Louis T. Chau board certified?
Yes. Dr. Chau is board certified in emergency medicine by the American Board of Emergency Medicine.
Show 5 more questionsShow fewer questions
What services does Dr. Louis T. Chau bill to Medicare?
In 2024, Dr. Chau's most billed Medicare services were emergency department visit (99284).
Where did Dr. Louis T. Chau go to medical school?
Dr. Chau graduated from UC Irvine School of Medicine in 1996.
What drugs does Dr. Louis T. Chau prescribe most?
In 2024 Medicare Part D data, Dr. Chau's most prescribed drugs by claims were Cephalexin, Prednisone and Hydrocodone-Acetaminophen.
How long has Dr. Louis T. Chau been practicing?
Dr. Chau graduated from medical school in 1996, 30 years ago.
What insurance does Dr. Louis T. Chau accept?
Dr. Chau is in network with 1 carrier, including Kaiser Permanente. HMO plans come from the most carriers, 1. Check the plan with the practice before a visit.
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