Dr. Clark S. Tsai, MD
- Medicare services, 2024
- 12,665
- Medicare patients, 2024
- 1,002
- Part D claims, 2024
- 7,502
- Publications
- 13
- Clinical trials
- 2
- Practice address
- 2225 Port Chicago Hwy, Concord, CA 94520-2051
- Practice phone
- Call (925) 689-7744
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Clark S Tsai MD-Eye Center
Physician office · Concord, California
Find Dr. Tsai's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Clark S. Tsai is an ophthalmologist in Concord, California
Dr. Tsai practices at Clark S Tsai MD-Eye Center in Concord, California.
Dr. Tsai's NPI, 1720096829, was assigned on August 4, 2006. Dr. Tsai graduated from Albert Einstein College of Medicine in 1988. Dr. Tsai holds California license G76192.
- NPI
- 1720096829NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4688625528
- NPI enumeration date
- August 4, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (925) 689-7744
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 64
- Medical school graduation
- 1988
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Clark S. Tsai practices at Clark S Tsai MD-Eye Center in Concord, California
Dr. Tsai's primary practice is Clark S Tsai MD-Eye Center, at 2225 Port Chicago Hwy, Concord, CA 94520-2051. The practice phone is (925) 689-7744.
- Clark S Tsai MD-Eye Center2225 Port Chicago Hwy, Concord, CA 94520-2051Phone(925) 689-7744
Source: Dmand AI Affiliation Data
Dr. Clark S. Tsai is affiliated with 3 sites of care and 1 medical group
Dr. Tsai's primary practice is Clark S Tsai MD-Eye Center in Concord, California. Dr. Tsai is also affiliated with Alta Bates Summit Medical Center | Alta Bates Campus. The medical group on file is John Muir Health. Dmand AI also links Dr. Tsai to 1 more group practice or clinic, named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Clark S. Tsai's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Tsai practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Clark S Tsai MD-Eye 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. Clark S. Tsai is one of 2,621 ophthalmologists in California
Ophthalmology is Dr. Tsai's primary specialty in the NPI Registry, under taxonomy code 207W00000X. Dr. Tsai is board certified in ophthalmology by the American Board of Ophthalmology. Dmand AI has Dr. Tsai's licenses on file in 3 states: California, Florida and Michigan.
Specialties and state licenses
- Ophthalmology, CaliforniaPrimary
- Florida license
- Michigan license
Clinical focus
Dmand AI lists age-related macular degeneration, cataract, cataract surgery with lens implant, conjunctivitis, dry eye, eye infection or inflammation, glaucoma and glaucoma surgery among the conditions Dr. Tsai treats.
Ophthalmologists near Dr. Tsai
Counts of ophthalmologists 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. Clark S. Tsai billed Medicare for 12,665 services in 2024
CMS data shows 12,665 Medicare services from Dr. Tsai across 34 procedure codes in 2024, for 1,002 Medicare patients. Medicare paid $921,335 for them.
Dr. Tsai's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Tests and treatments
- 2023: 10,0292024: 9,4126%
- Imaging
- 2023: 1,8772024: 1,7377%
- Surgery
- 2023: 9752024: 1,25529%
- Drugs given in the office
- 2023: 1212024: 17645%
- Office and hospital visits
- 2023: 652024: 8531%
Where Dr. Tsai's Medicare services took place, 2024
- In an office12,36498%
- In a facility3012%
Dr. Tsai compared with the California median for ophthalmologists, 2024
- Dr. Tsai
- California median
- Medicare services
- 12,665vs 1,07911.7 times
- Medicare patients
- 1,002vs 4212.4 times
- Part D claims
- 7,371vs 61811.9 times
Medians across 2,568 ophthalmologists in California with Dmand AI profiles that report each measure.
Dr. Tsai'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 Dr. Tsai?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Tsai and other ophthalmologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Clark S. Tsai treated 1,002 Medicare patients in 2024, average age 76
CMS counts 1,002 Medicare patients who saw Dr. Tsai in 2024. The largest group is 65 to 74, with 409 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 61% are also on Medicaid. Their average risk score is 1.23, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Tsai's median patient age at 75, with 55% women.
Dr. Tsai's Medicare patients by age, 2024
Dr. Tsai's Medicare patients by sex, 2024
- Women60861%
- Men39439%
Chronic conditions among Dr. Tsai's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Diabetes41%
- Arthritis35%
- Chronic kidney disease25%
- Ischemic heart disease18%
- Mood disorders18%
- Osteoporosis18%
Share of Medicare patients with each condition. A patient can have several.
Dr. Tsai's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 75
Patient panel by sex, all payers
- Women55%
- Men40%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Clark S. Tsai wrote 7,502 Medicare Part D claims in 2024
In 2024, Dr. Tsai wrote 7,502 Medicare Part D claims for 1,191 patients. 65% of them were for generic drugs. CMS names the drug for 7,371 of them, across 30 drugs with 11 or more claims each, at $487,041 in total drug cost. In 2023, CMS named 6,692 claims across 34 drugs.
Dr. Tsai's Part D claims by kind of drug, 2024
- Generic4,896 claims65%
- Brand-name2,606 claims35%
Dr. Tsai'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. Tsai's Part D claims, 2024
- Antibiotics0%24 of 7,502 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: 6,6922024: 7,37110%
Drugs named by CMS: 30 in 2024, 34 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
Dr. Clark S. Tsai scored 93 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 93 out of 100 for Dr. Tsai for performance year 2024, reported individually. Dr. Tsai accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 196 procedures of cataract surgery by Dr. Tsai, more than 84% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Dr. Tsai's MIPS scores, performance year 2024
- 93of 100Final score
- 86of 100Quality
- 40of 100Improvement Activities
- 78of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Where Dr. Tsai ranks in Medicare procedure volume
- Cataract surgery
- 84th percentile196 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026; and Doctors and Clinicians Utilization Data (CMS)
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Dr. Clark S. Tsai has 13 publications on record
Dmand AI links 13 papers to Dr. Tsai. The most frequent topics are Optic Disk, Glaucoma, Open-Angle and Image Processing, Computer-Assisted. Dr. Tsai has published most often in Ophthalmology. Dr. Tsai's most frequent co-authors are Kyle A. Parrow, MD and Talya H. Kupin, MD.
Topics Dr. Tsai writes about most
- Optic Disk
- Glaucoma, Open-Angle
- Image Processing, Computer-Assisted
- Intraocular Pressure
- Trabeculectomy
- Tonometry, Ocular
- Analysis of Variance
- Glaucoma
Dr. Tsai's most frequent co-authors
Recent publications by Dr. Tsai
Graefes Arch Clin Exp Ophthalmol
Ophthalmology
Am J Ophthalmol
See who Dr. Tsai researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Tsai works with, so you can find a warm path to the right ophthalmologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Clark S. Tsai has worked on 2 clinical trials
Dmand AI links Dr. Tsai to 2 clinical trials. Conditions studied include Conjunctivitis, Bacterial and Eye Infections, Bacterial. Shire sponsors the most, 2.
Conditions in Dr. Tsai's trials
- Conjunctivitis, Bacterial
- Eye Infections, Bacterial
Investigators on the most trials with Dr. Tsai
- Frank W. Bowden, MD2 shared trials
- Carlos A. Gonzales, MD2 shared trials
- David Carl Klein, MD2 shared trials
Recent clinical trials with Dr. Tsai
Treatment of Adenoviral Conjunctivitis With SHP640 Compared to Placebo (opens in a new tab)
Sources: Dmand AI Research Linkage; and ClinicalTrials.gov (National Library of Medicine)
Dr. Clark S. Tsai received $7,883 in industry payments from 2016 to 2025
CMS Open Payments shows 101 general payments to Dr. Tsai from 27 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 55% of the total. MacuLogix, Inc. paid the most, $1,696.
General payments to Dr. Tsai by program year, 2016 to 2025
General payments to Dr. Tsai by kind, 2016 to 2025
- Food and beverage$4,34355%
- Gifts$1,69922%
- Speaker and faculty fees$1,16515%
- Honoraria$5006%
- Other$1612%
Companies that paid Dr. Tsai the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Clark S. Tsai has 2 awards and honors on record
Dmand AI lists 2 awards for Dr. Tsai, most recently CMS Stage 1 EHR in 2013.
Awards and honors for Dr. Tsai
- 2013
- CMS Stage 1 EHR
- Undated
- AAO Fellow
Source: Dmand AI Professional Profile Data
Dr. Clark S. Tsai graduated from Albert Einstein College of Medicine
Dr. Tsai graduated from Albert Einstein College of Medicine in 1988. Dr. Tsai is a member of AAO.
- Medical school
- Board certified in ophthalmology
Source: Dmand AI Professional Profile Data
Dr. Clark S. Tsai accepts plans from 15 insurance carriers
Dr. Tsai is in network with 15 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. Medicare plans come from the most carriers, 9. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Michigan
- United Healthcare
- Blue Cross Blue Shield of Massachusetts
- Elevance
- HCSC
- Humana
- Regence Health Plans
- +7 more carriersWith a free account
Plan types Dr. Tsai accepts, by number of carriers
- Medicare9
- PPO9
- HMO8
- EPO4
- POS4
Source: Dmand AI Insurance Network Data
Sources for Dr. Clark S. Tsai'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 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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Clinical trials and co-investigators | Dmand AI Research LinkageClinicalTrials.gov (National Library of Medicine) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| 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. Clark S. Tsai
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. Clark S. Tsai's NPI number?
Dr. Clark S. Tsai's NPI number is 1720096829. It was assigned on August 4, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Clark S. Tsai?
Dr. Clark S. Tsai is an ophthalmologist in Concord, California. The primary specialty in the NPI Registry is Ophthalmology Physician (taxonomy code 207W00000X).
Where does Dr. Clark S. Tsai practice?
Dr. Tsai practices at 2225 Port Chicago Hwy, Concord, CA 94520-2051. Dr. Tsai's primary practice is Clark S Tsai MD-Eye Center in Concord, California. Dmand AI also links Dr. Tsai to 1 group practice or clinic.
What is Dr. Clark S. Tsai's office phone number?
The practice phone on file for Dr. Tsai is (925) 689-7744.
What is Dr. Clark S. Tsai's medical license number?
Dr. Tsai holds California license G76192, one of the licenses on file in 3 states.
Which states has Dr. Clark S. Tsai been licensed in?
Dmand AI has state licenses on file for Dr. Tsai in California (1993 to 2026), Florida (1996 to 1998) and Michigan (1990 to 1993).
Which hospitals is Dr. Clark S. Tsai affiliated with?
Dr. Tsai is affiliated with Alta Bates Summit Medical Center | Alta Bates Campus.
What medical group is Dr. Clark S. Tsai part of?
Dr. Tsai is linked to John Muir Health.
Does Dr. Clark S. Tsai accept Medicare?
Yes. CMS data shows Dr. Tsai billed Medicare for 12,665 services in 2024, and Dr. Tsai accepts Medicare assignment.
What is Dr. Clark S. Tsai's MIPS score?
Dr. Tsai's MIPS final score for performance year 2024 is 93 out of 100, reported individually.
Show 10 more questionsShow fewer questions
How many Medicare patients does Dr. Clark S. Tsai see?
CMS counts 1,002 Medicare patients who saw Dr. Tsai in 2024, with an average age of 76.
Is Dr. Clark S. Tsai board certified?
Yes. Dr. Tsai is board certified in ophthalmology by the American Board of Ophthalmology.
What services does Dr. Clark S. Tsai bill to Medicare?
In 2024, Dr. Tsai's most billed Medicare services were eye exam or test (92014), eye exam or test (92100) and eye exam or test (92250).
Where did Dr. Clark S. Tsai go to medical school?
Dr. Tsai graduated from Albert Einstein College of Medicine in 1988.
What drugs does Dr. Clark S. Tsai prescribe most?
In 2024 Medicare Part D data, Dr. Tsai's most prescribed drugs by claims were Latanoprost, Brimonidine Tartrate and Timolol Maleate.
Has Dr. Clark S. Tsai received payments from drug or device companies?
CMS Open Payments shows $7,883 in general payments to Dr. Tsai from 27 companies from 2016 to 2025. The largest total came from MacuLogix, Inc.
How long has Dr. Clark S. Tsai been practicing?
Dr. Tsai graduated from medical school in 1988, 38 years ago.
Does Dr. Clark S. Tsai do research?
Dmand AI links 13 publications to Dr. Tsai. Dr. Tsai has worked on 2 clinical trials.
Who does Dr. Clark S. Tsai publish with?
Dr. Tsai's most frequent co-authors are Kyle A. Parrow, MD (3 shared papers) and Talya H. Kupin, MD (1 shared paper).
What insurance does Dr. Clark S. Tsai accept?
Dr. Tsai is in network with 15 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. Medicare plans come from the most carriers, 9. Check the plan with the practice before a visit.
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