Dr. Tom Hong-Chih Sun, MD
- Medicare services, 2024
- 4,683
- Medicare patients, 2024
- 1,789
- Part D claims, 2024
- 5,145
- MIPS score, 2024
- 75
- Hospital affiliations
- 1
- Practice address
- 4615 Southwest Fwy, Houston, TX 77027
- Practice phone
- Call (713) 877-0600
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Isurg of Spring
Houston, Texas
Find Dr. Sun's professional email, personal email and mobile number
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Dr. Tom Hong-Chih Sun is an ophthalmologist in Houston, Texas
Dr. Sun practices at Isurg of Spring in Houston, Texas.
Dr. Sun's NPI, 1306803283, was assigned on April 26, 2006. Dr. Sun graduated from Rutgers R W Johnson Medical School (Cam/New Bruns/Pisc) in 1990. Dr. Sun holds Texas license J6258.
- NPI
- 1306803283NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3678562782
- NPI enumeration date
- April 26, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (713) 877-0600
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 62
- Medical school graduation
- 1990
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Tom Hong-Chih Sun practices at Isurg of Spring in Houston, Texas
Dr. Sun's primary practice is Isurg of Spring, at 4615 Southwest Fwy, Houston, TX 77027 in Harris County. The practice phone is (713) 877-0600.
- Isurg of Spring4615 Southwest Fwy, Houston, TX 77027 · Harris CountyPhone(713) 877-0600
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Tom Hong-Chih Sun is affiliated with 3 sites of care and 1 medical group
Dr. Sun's primary practice is Isurg of Spring in Houston, Texas. Dr. Sun is also affiliated with HCA Houston Healthcare Tomball. Dmand AI also links Dr. Sun to 1 more 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. Tom Hong-Chih Sun's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Sun practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Isurg of Spring | Available with a free account |
| +2 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Tom Hong-Chih Sun is one of 1,311 ophthalmologists in Texas
Ophthalmology is Dr. Sun's primary specialty in the NPI Registry, under taxonomy code 207W00000X. Dr. Sun is licensed in Texas.
Specialties and state licenses
- Ophthalmology, TexasPrimary
Ophthalmologists near Dr. Sun
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. Tom Hong-Chih Sun billed Medicare for 4,683 services in 2024
CMS data shows 4,683 Medicare services from Dr. Sun across 13 procedure codes in 2024, for 1,789 Medicare patients. Medicare paid $422,981 for them.
Dr. Sun's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Tests and treatments
- 2023: 4,4202024: 4,1775%
- Surgery
- 2023: 4822024: 42312%
- Imaging
- 2023: 582024: 8343%
Where Dr. Sun's Medicare services took place, 2024
- In an office4,35193%
- In a facility3327%
Dr. Sun compared with the Texas median for ophthalmologists, 2024
- Dr. Sun
- Texas median
- Medicare services
- 4,683vs 1,3533.5 times
- Medicare patients
- 1,789vs 4923.6 times
- Part D claims
- 5,069vs 6138.3 times
Medians across 1,290 ophthalmologists in Texas with Dmand AI profiles that report each measure.
Dr. Sun'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. Sun and other ophthalmologists in Texas.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Tom Hong-Chih Sun treated 1,789 Medicare patients in 2024, average age 77
CMS counts 1,789 Medicare patients who saw Dr. Sun in 2024. The largest group is 75 to 84, with 818 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 2% are also on Medicaid. Their average risk score is 1.15, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Sun's median patient age at 75, with 59% women.
Dr. Sun's Medicare patients by age, 2024
Dr. Sun's Medicare patients by sex, 2024
- Women1,08060%
- Men70940%
Chronic conditions among Dr. Sun's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis48%
- Ischemic heart disease37%
- Diabetes35%
- Chronic kidney disease28%
- Atrial fibrillation21%
- Osteoporosis19%
Share of Medicare patients with each condition. A patient can have several.
Dr. Sun'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
- Women59%
- Men39%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Tom Hong-Chih Sun wrote 5,145 Medicare Part D claims in 2024
In 2024, Dr. Sun wrote 5,145 Medicare Part D claims for 1,145 patients. 63% of them were for generic drugs. CMS names the drug for 5,069 of them, across 26 drugs with 11 or more claims each, at $266,481 in total drug cost. In 2023, CMS named 4,268 claims across 28 drugs.
Dr. Sun's Part D claims by kind of drug, 2024
- Generic3,228 claims63%
- Brand-name1,917 claims37%
Dr. Sun'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. Sun's Part D claims, 2024
- Antibiotics1%39 of 5,145 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: 4,2682024: 5,06919%
Drugs named by CMS: 26 in 2024, 28 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. Tom Hong-Chih Sun scored 75 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 75 out of 100 for Dr. Sun for performance year 2024, reported as part of a group. Dr. Sun accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 558 procedures of cataract surgery by Dr. Sun, more than 96% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
- MIPS final score, 2024
- 75 of 100
Where Dr. Sun ranks in Medicare procedure volume
- Cataract surgery
- 96th percentile558 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. Tom Hong-Chih Sun received $47,686 in industry payments from 2016 to 2025
CMS Open Payments shows 152 general payments to Dr. Sun from 24 drug and device companies from 2016 to 2025. Consulting fees make up the largest share, 84% of the total. RxSight Inc paid the most, $40,181.
General payments to Dr. Sun by program year, 2016 to 2025
General payments to Dr. Sun by kind, 2016 to 2025
- Consulting fees$40,00084%
- Food and beverage$6,98815%
- Travel and lodging$6401%
- Honoraria$390%
- Gifts$190%
Companies that paid Dr. Sun 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. Tom Hong-Chih Sun graduated from Rutgers R W Johnson Medical School (Cam/New Bruns/Pisc)
Dr. Sun graduated from Rutgers R W Johnson Medical School (Cam/New Bruns/Pisc) in 1990.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Tom Hong-Chih Sun'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 |
| 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. Tom Hong-Chih Sun
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. Tom Hong-Chih Sun's NPI number?
Dr. Tom Hong-Chih Sun's NPI number is 1306803283. It was assigned on April 26, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Tom Hong-Chih Sun?
Dr. Tom Hong-Chih Sun is an ophthalmologist in Houston, Texas. The primary specialty in the NPI Registry is Ophthalmology Physician (taxonomy code 207W00000X).
Where does Dr. Tom Hong-Chih Sun practice?
Dr. Sun practices at 4615 Southwest Fwy, Houston, TX 77027. Dr. Sun's primary practice is Isurg of Spring in Houston, Texas. Dmand AI also links Dr. Sun to 1 group practice or clinic and 1 medical group.
What is Dr. Tom Hong-Chih Sun's office phone number?
The practice phone on file for Dr. Sun is (713) 877-0600.
What is Dr. Tom Hong-Chih Sun's medical license number?
Dr. Sun holds Texas license J6258.
Which hospitals is Dr. Tom Hong-Chih Sun affiliated with?
Dr. Sun is affiliated with HCA Houston Healthcare Tomball.
Does Dr. Tom Hong-Chih Sun accept Medicare?
Yes. CMS data shows Dr. Sun billed Medicare for 4,683 services in 2024, and Dr. Sun accepts Medicare assignment.
What is Dr. Tom Hong-Chih Sun's MIPS score?
Dr. Sun's MIPS final score for performance year 2024 is 75 out of 100, reported as part of a group.
How many Medicare patients does Dr. Tom Hong-Chih Sun see?
CMS counts 1,789 Medicare patients who saw Dr. Sun in 2024, with an average age of 77.
What services does Dr. Tom Hong-Chih Sun bill to Medicare?
In 2024, Dr. Sun's most billed Medicare services were eye exam or test (92014), eye exam or test (92012) and eye exam or test (92134).
Show 4 more questionsShow fewer questions
Where did Dr. Tom Hong-Chih Sun go to medical school?
Dr. Sun graduated from Rutgers R W Johnson Medical School (Cam/New Bruns/Pisc) in 1990.
What drugs does Dr. Tom Hong-Chih Sun prescribe most?
In 2024 Medicare Part D data, Dr. Sun's most prescribed drugs by claims were Latanoprost, Prednisolone Acetate and Neomycin-Polymyxin-Dexameth.
Has Dr. Tom Hong-Chih Sun received payments from drug or device companies?
CMS Open Payments shows $47,686 in general payments to Dr. Sun from 24 companies from 2016 to 2025. The largest total came from RxSight Inc.
How long has Dr. Tom Hong-Chih Sun been practicing?
Dr. Sun graduated from medical school in 1990, 36 years ago.
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