Dr. Clark S. Tsai, MD

  • Concord, CA
  • Ophthalmologist
NPI1720096829PAC ID4688625528
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
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Personal email
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Mobile number
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Social profiles

Primary practice

Clark S Tsai MD-Eye Center

Physician office · Concord, California

See all 4 affiliations

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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 and contact details
Medicare PAC ID
4688625528
NPI enumeration date
August 4, 2006
NPI status
Active
Accepts Medicare assignment
Yes
Practice phone
(925) 689-7744
Professional email
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Personal email
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Mobile number
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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 Center
    2225 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.

See all 4 affiliations for Dr. Tsai

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.

EHR by site
SiteEHR vendor and product
Clark S Tsai MD-Eye CenterAvailable with a free account
+2 more affiliated sitesAvailable 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, CaliforniaPrimaryLicense G76192 · 1993 to 2026 · taxonomy 207W00000X
  • Florida license1996 to 1998
  • Michigan license1990 to 1993

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.

Medicare services, 202412,665
Medicare patients1,002
Paid by Medicare$921,335
Procedure codes34

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.

See all procedures by Dr. Tsai

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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.

Medicare patients, 20241,002
Average age76
Average risk score1.23
Also on Medicaid61%

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

  1. High blood pressure75%
  2. High cholesterol75%
  3. Diabetes41%
  4. Arthritis35%
  5. Chronic kidney disease25%
  6. Ischemic heart disease18%
  7. Mood disorders18%
  8. 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.

Part D claims, 20247,502
Drugs named by CMS30
Total drug cost$487,041
Part D patients1,191

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.

See all prescribing by Dr. Tsai

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.

Papers13

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

See all 13 publications and co-authors

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.

How network discovery works

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

Recent clinical trials with Dr. Tsai

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

$7.9Kin total
  • 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.

See all payments to Dr. Tsai

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

  1. 2013
    • CMS Stage 1 EHR
  2. 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.

  1. Medical schoolAlbert Einstein College of Medicine
  2. Board certified in ophthalmologyAmerican Board of 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

  1. Medicare9
  2. PPO9
  3. HMO8
  4. EPO4
  5. POS4

Source: Dmand AI Insurance Network Data

Sources for Dr. Clark S. Tsai's profile data

Sources for the data on this page
Data on this pageSource
NPI, name, sex, specialty and licensesNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data
Practice locations and phoneDmand AI Affiliation Data
Primary practice, affiliations and health systemDmand AI Affiliation Data
Medicare services and procedure codesMedicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab)
State medians for the same specialtyDmand AI Peer Benchmarks
Medicare patients and the all-payer patient panelDmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab)
Part D prescribingMedicare 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 percentilesDoctors 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-authorsPubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage
Clinical trials and co-investigatorsDmand AI Research LinkageClinicalTrials.gov (National Library of Medicine) (opens in a new tab)
Industry paymentsOpen Payments (CMS) (opens in a new tab)
Awards and committee rolesDmand AI Professional Profile Data
Training, board certification and membershipsDmand AI Professional Profile Data
Insurance carriers and plan typesDmand AI Insurance Network Data
EHR at each practice siteDmand AI Technology Install Data
Similar physiciansDmand 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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