Dr. Chee Hian Tan, MD, PhD
- Medicare services, 2024
- 2,914
- Medicare patients, 2024
- 721
- Part D claims, 2024
- 1,568
- MIPS score, 2024
- 100
- Industry payments
- $911
- Practice address
- 8940 N Reseda Blvd, Northridge, CA 91324
- Practice phone
- Call (818) 993-5410
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Richard H. Yook, M.D, Inc.
Northridge, California
Find Dr. Tan'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. Chee Hian Tan is an ophthalmologist in Northridge, California
Dr. Tan practices at Richard H. Yook, M.D, Inc. in Northridge, California.
Dr. Tan's NPI, 1346263357, was assigned on July 25, 2006. Dr. Tan graduated from University of Sydney Faculty of Medicine in 1994. Dr. Tan holds California license A111014.
- NPI
- 1346263357NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8022144237
- NPI enumeration date
- July 25, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (818) 993-5410
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 59
- Medical school graduation
- 1994
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Chee Hian Tan practices at Richard H. Yook, M.D, Inc. in Northridge, California
Dr. Tan's primary practice is Richard H. Yook, M.D, Inc., at 8940 N Reseda Blvd, Northridge, CA 91324 in Los Angeles County. The practice phone is (818) 993-5410.
- Richard H. Yook, M.D, Inc.8940 N Reseda Blvd, Northridge, CA 91324 · Los Angeles CountyPhone(818) 993-5410
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Chee Hian Tan is affiliated with 2 sites of care and 1 medical group
Dr. Tan's primary practice is Richard H. Yook, M.D, Inc. in Northridge, California. Dmand AI also links Dr. Tan to 1 group practice or clinic and 1 medical group, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Chee Hian Tan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Tan practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Richard H. Yook, M.D, Inc. | Available with a free account |
| +1 more site and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Chee Hian Tan is one of 2,621 ophthalmologists in California
Ophthalmology is Dr. Tan's primary specialty in the NPI Registry, under taxonomy code 207W00000X. Dr. Tan is board certified in ophthalmology by the American Board of Ophthalmology. Dmand AI has Dr. Tan's licenses on file in 2 states: California and Wisconsin.
Specialties and state licenses
- Ophthalmology, CaliforniaPrimary
- Wisconsin license
Clinical focus
Dmand AI lists age-related macular degeneration, cataract, cataract surgery with lens implant, cold sores or genital herpes, conjunctivitis, dry eye, eyelid inflammation and glaucoma among the conditions Dr. Tan treats.
Ophthalmologists near Dr. Tan
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. Chee Hian Tan billed Medicare for 2,914 services in 2024
CMS data shows 2,914 Medicare services from Dr. Tan across 13 procedure codes in 2024, for 721 Medicare patients. Medicare paid $243,103 for them.
Dr. Tan's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Tests and treatments
- 2023: 2,0052024: 2,71736%
- Surgery
- 2023: 1482024: 19733%
Where Dr. Tan's Medicare services took place, 2024
- In an office2,82797%
- In a facility873%
Dr. Tan compared with the California median for ophthalmologists, 2024
- Dr. Tan
- California median
- Medicare services
- 2,914vs 1,0792.7 times
- Medicare patients
- 721vs 42171% above
- Part D claims
- 1,477vs 6182.4 times
Medians across 2,568 ophthalmologists in California with Dmand AI profiles that report each measure.
Dr. Tan'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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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Chee Hian Tan treated 721 Medicare patients in 2024, average age 77
CMS counts 721 Medicare patients who saw Dr. Tan in 2024. The largest group is 75 to 84, with 308 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 5% are also on Medicaid. Their average risk score is 1.01, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Tan's median patient age at 74, with 58% women.
Dr. Tan's Medicare patients by age, 2024
Dr. Tan's Medicare patients by sex, 2024
- Women43260%
- Men28940%
Chronic conditions among Dr. Tan's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis48%
- Diabetes34%
- Ischemic heart disease32%
- Osteoporosis21%
- Chronic kidney disease20%
- Cancer17%
Share of Medicare patients with each condition. A patient can have several.
Dr. Tan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 74
Patient panel by sex, all payers
- Women58%
- Men40%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Chee Hian Tan wrote 1,568 Medicare Part D claims in 2024
In 2024, Dr. Tan wrote 1,568 Medicare Part D claims for 303 patients. 64% of them were for generic drugs. CMS names the drug for 1,477 of them, across 14 drugs with 11 or more claims each, at $60,156 in total drug cost. In 2023, CMS named 1,208 claims across 12 drugs.
Dr. Tan's Part D claims by kind of drug, 2024
- Generic1,008 claims64%
- Brand-name560 claims36%
Dr. Tan'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. Tan's Part D claims, 2024
- Antibiotics1%15 of 1,568 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: 1,2082024: 1,47722%
Drugs named by CMS: 14 in 2024, 12 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. Chee Hian Tan scored 100 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 100 out of 100 for Dr. Tan for performance year 2024, reported individually. Dr. Tan accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 188 procedures of cataract surgery by Dr. Tan, more than 83% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Dr. Tan's MIPS scores, performance year 2024
- 100of 100Final score
- 100of 100Quality
- 40of 100Improvement Activities
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Where Dr. Tan ranks in Medicare procedure volume
- Cataract surgery
- 83rd percentile188 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. Chee Hian Tan received $911 in industry payments from 2017 to 2025
CMS Open Payments shows 16 general payments to Dr. Tan from 8 drug and device companies from 2017 to 2025. Food and beverage make up the largest share, 100% of the total. Alcon Laboratories Inc paid the most, $220.
General payments to Dr. Tan by program year, 2017 to 2025
Companies that paid Dr. Tan the most, 2017 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Chee Hian Tan graduated from University of Sydney Faculty of Medicine
Dr. Tan graduated from University of Sydney Faculty of Medicine in 1994.
- Medical school
- Board certified in ophthalmology
Source: Dmand AI Professional Profile Data
Dr. Chee Hian Tan accepts plans from 15 insurance carriers
Dr. Tan is in network with 15 carriers, including United Healthcare, Elevance and HCSC. PPO plans come from the most carriers, 9. Check the plan with the practice before a visit.
- United Healthcare
- Elevance
- HCSC
- Aetna
- Blue Cross Blue Shield of Massachusetts
- Blue Cross Blue Shield of Michigan
- Humana
- Alliant Health Plans
- +7 more carriersWith a free account
Plan types Dr. Tan accepts, by number of carriers
- PPO9
- HMO6
- Medicare6
- EPO3
- POS2
Source: Dmand AI Insurance Network Data
Sources for Dr. Chee Hian Tan'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand 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) |
| 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 Dr. Chee Hian Tan
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. Chee Hian Tan's NPI number?
Dr. Chee Hian Tan's NPI number is 1346263357. It was assigned on July 25, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Chee Hian Tan?
Dr. Chee Hian Tan is an ophthalmologist in Northridge, California. The primary specialty in the NPI Registry is Ophthalmology Physician (taxonomy code 207W00000X).
Where does Dr. Chee Hian Tan practice?
Dr. Tan practices at 8940 N Reseda Blvd, Northridge, CA 91324. Dr. Tan's primary practice is Richard H. Yook, M.D, Inc. in Northridge, California. Dmand AI also links Dr. Tan to 1 group practice or clinic and 1 medical group.
What is Dr. Chee Hian Tan's office phone number?
The practice phone on file for Dr. Tan is (818) 993-5410.
What is Dr. Chee Hian Tan's medical license number?
Dr. Tan holds California license A111014, one of the licenses on file in 2 states.
Which states has Dr. Chee Hian Tan been licensed in?
Dmand AI has state licenses on file for Dr. Tan in California (2010 to 2027) and Wisconsin (2008 to 2025).
Does Dr. Chee Hian Tan accept Medicare?
Yes. CMS data shows Dr. Tan billed Medicare for 2,914 services in 2024, and Dr. Tan accepts Medicare assignment.
What is Dr. Chee Hian Tan's MIPS score?
Dr. Tan's MIPS final score for performance year 2024 is 100 out of 100, reported individually.
How many Medicare patients does Dr. Chee Hian Tan see?
CMS counts 721 Medicare patients who saw Dr. Tan in 2024, with an average age of 77.
Is Dr. Chee Hian Tan board certified?
Yes. Dr. Tan is board certified in ophthalmology by the American Board of Ophthalmology.
Show 6 more questionsShow fewer questions
What services does Dr. Chee Hian Tan bill to Medicare?
In 2024, Dr. Tan's most billed Medicare services were eye exam or test (92014), eye exam or test (92012) and eye exam or test (92134).
Where did Dr. Chee Hian Tan go to medical school?
Dr. Tan graduated from University of Sydney Faculty of Medicine in 1994.
What drugs does Dr. Chee Hian Tan prescribe most?
In 2024 Medicare Part D data, Dr. Tan's most prescribed drugs by claims were Latanoprost, Dorzolamide-Timolol and Prednisolone Acetate.
Has Dr. Chee Hian Tan received payments from drug or device companies?
CMS Open Payments shows $911 in general payments to Dr. Tan from 8 companies from 2017 to 2025. The largest total came from Alcon Laboratories Inc.
How long has Dr. Chee Hian Tan been practicing?
Dr. Tan graduated from medical school in 1994, 32 years ago.
What insurance does Dr. Chee Hian Tan accept?
Dr. Tan is in network with 15 carriers, including United Healthcare, Elevance and HCSC. PPO plans come from the most carriers, 9. Check the plan with the practice before a visit.
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