Gary S. Chan
- Medicare services, 2024
- 192
- Medicare patients, 2024
- 318
- Hospital affiliations
- 2
- Industry payments
- $160
- Medical group
- 1
- Practice address
- 215 W Janss Rd, Thousand Oaks, CA 91360
- Practice phone
- Call (805) 497-2727
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Gary Chan's professional email, personal email and mobile number
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Gary S. Chan is an anesthesiologist in Thousand Oaks, California
Gary Chan practices at Los Robles Regional Medical Center in Thousand Oaks, California, part of HCA Healthcare.
Gary Chan's NPI, 1346694536, was assigned on April 14, 2016. Gary Chan graduated from Ohio State College of Medicine in 2016. Gary Chan's California license number on file is A166343.
- NPI
- 1346694536NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3476899352
- NPI enumeration date
- April 14, 2016
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (805) 497-2727
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 36
- Medical school graduation
- 2016
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Gary S. Chan practices at Los Robles Regional Medical Center in Thousand Oaks, California
Gary Chan's primary practice is Los Robles Regional Medical Center, at 215 W Janss Rd, Thousand Oaks, CA 91360 in Ventura County. The practice phone is (805) 497-2727.
- Los Robles Regional Medical Center215 W Janss Rd, Thousand Oaks, CA 91360 · Ventura CountyPhone(805) 497-2727
Source: Dmand AI Affiliation Data
Gary S. Chan is affiliated with 2 sites of care and 1 medical group
Gary Chan's primary practice is Los Robles Regional Medical Center in Thousand Oaks, California, part of HCA Healthcare. Gary Chan is also affiliated with Ronald Reagan UCLA Medical Center. The medical group on file is Conejo Los Robles Anesthesiology Medical Group (CLRAMG).
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Gary S. Chan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Gary Chan practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Los Robles Regional Medical Center | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Gary S. Chan is one of 6,593 anesthesiologists in California
Anesthesiology is Gary Chan's primary specialty in the NPI Registry, under taxonomy code 207L00000X. Gary Chan is board certified in anesthesiology by the American Board of Anesthesiology. Gary Chan has a license on file in California.
Specialties and state licenses
- Anesthesiology, CaliforniaPrimary
Anesthesiologists near Gary Chan
Counts of anesthesiologists 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
Gary S. Chan billed Medicare for 192 services in 2024
CMS data shows 192 Medicare services from Gary Chan across 10 procedure codes in 2024, for 318 Medicare patients. Medicare paid $28,409 for them. Every service was in a facility, such as a hospital, rather than an office.
Gary Chan's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Anesthesia
- 2023: 1402024: 18129%
- Surgery
- 2023: 162024: 1131%
Gary Chan compared with the California median for anesthesiologists, 2024
- Gary Chan
- California median
- Medicare services
- 192vs 722.7 times
- Medicare patients
- 318vs 1432.2 times
Medians across 5,562 anesthesiologists in California with Dmand AI profiles that report each measure.
Gary Chan'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.
Need commercial claims for Gary Chan?
Medicare shows one payer. Book a meeting to get commercial claims data for Gary Chan and other anesthesiologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Gary S. Chan treated 318 Medicare patients in 2024, average age 76
CMS counts 318 Medicare patients who saw Gary Chan in 2024. The largest group is 65 to 74, with 144 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 7% are also on Medicaid. Their average risk score is 1.41, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Gary Chan's median patient age at 55, with 62% women.
Gary Chan's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Gary Chan's Medicare patients by sex, 2024
- Women18157%
- Men13743%
Chronic conditions among Gary Chan's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis64%
- Ischemic heart disease34%
- Atrial fibrillation30%
- Anxiety29%
- Diabetes29%
- Cancer27%
Share of Medicare patients with each condition. A patient can have several.
Gary Chan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 55
Patient panel by sex, all payers
- Women62%
- Men37%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
How Gary S. Chan takes part in Medicare
Gary Chan accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Gary S. Chan received $160 in industry payments from 2021 to 2023
CMS Open Payments shows 4 general payments to Gary Chan from 2 drug and device companies from 2021 to 2023. Food and beverage make up the largest share, 100% of the total. Halyard Health, Inc. paid the most, $103.
General payments to Gary Chan by program year, 2021 to 2023
Companies that paid Gary Chan the most, 2021 to 2023
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Gary S. Chan graduated from Ohio State College of Medicine
Gary Chan graduated from Ohio State College of Medicine in 2016.
- Medical school
- Board certified in anesthesiology
Source: Dmand AI Professional Profile Data
Gary S. Chan accepts plans from 6 insurance carriers
Gary Chan is in network with 6 carriers, including Elevance, Blue Cross Blue Shield of Michigan and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 6. Check the plan with the practice before a visit.
- Elevance
- Blue Cross Blue Shield of Michigan
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Regence Health Plans
- CMS Medicare
Plan types Gary Chan accepts, by number of carriers
- Medicare6
- PPO5
- HMO2
- POS2
- EPO1
Source: Dmand AI Insurance Network Data
Sources for Gary S. Chan'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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (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 Gary S. Chan
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Gary S. Chan's NPI number?
Gary S. Chan's NPI number is 1346694536. It was assigned on April 14, 2016, and it is active in the NPI Registry.
What does Gary S. Chan specialize in?
Gary S. Chan is an anesthesiologist in Thousand Oaks, California. The primary specialty in the NPI Registry is Anesthesiology Physician (taxonomy code 207L00000X).
Where does Gary S. Chan practice?
Gary Chan practices at 215 W Janss Rd, Thousand Oaks, CA 91360. Gary Chan's primary practice is Los Robles Regional Medical Center in Thousand Oaks, California, part of HCA Healthcare.
What is Gary S. Chan's office phone number?
The practice phone on file for Gary Chan is (805) 497-2727.
What is Gary S. Chan's medical license number?
Gary Chan's California license number on file is A166343.
Which hospitals is Gary S. Chan affiliated with?
Gary Chan practices at Los Robles Regional Medical Center in Thousand Oaks, California. Gary Chan is also affiliated with Ronald Reagan UCLA Medical Center.
What medical group is Gary S. Chan part of?
Gary Chan is linked to Conejo Los Robles Anesthesiology Medical Group (CLRAMG).
Does Gary S. Chan accept Medicare?
Yes. CMS data shows Gary Chan billed Medicare for 192 services in 2024, and Gary Chan accepts Medicare assignment.
How many Medicare patients does Gary S. Chan see?
CMS counts 318 Medicare patients who saw Gary Chan in 2024, with an average age of 76.
Is Gary S. Chan board certified?
Yes. Gary Chan is board certified in anesthesiology by the American Board of Anesthesiology.
Show 5 more questionsShow fewer questions
What services does Gary S. Chan bill to Medicare?
In 2024, Gary Chan's most billed Medicare services were anesthesia (00731), anesthesia (00813) and anesthesia (00811).
Where did Gary S. Chan go to medical school?
Gary Chan graduated from Ohio State College of Medicine in 2016.
Has Gary S. Chan received payments from drug or device companies?
CMS Open Payments shows $160 in general payments to Gary Chan from 2 companies from 2021 to 2023. The largest total came from Halyard Health, Inc.
How long has Gary S. Chan been practicing?
Gary Chan graduated from medical school in 2016, 10 years ago.
What insurance does Gary S. Chan accept?
Gary Chan is in network with 6 carriers, including Elevance, Blue Cross Blue Shield of Michigan and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 6. Check the plan with the practice before a visit.
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