Total Payments
$107,945
2024 Payments
$38,390
Companies
28
Transactions
288
Medicare Patients
7,840
Medicare Billing
$841,494
Payment Breakdown by Category
Consulting$63,827 (59.1%)
Food & Beverage$15,225 (14.1%)
Research$12,819 (11.9%)
Other$8,923 (8.3%)
Travel$7,152 (6.6%)
Payments by Nature
| Nature of Payment | Amount | Transactions | Share |
|---|---|---|---|
| Consulting Fee | $63,827 | 38 | 59.1% |
| Food and Beverage | $15,225 | 218 | 14.1% |
| Unspecified | $12,819 | 3 | 11.9% |
| Travel and Lodging | $7,152 | 23 | 6.6% |
| Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program | $6,150 | 3 | 5.7% |
| Honoraria | $2,773 | 3 | 2.6% |
Payments by Type
General
$95,127
285 transactions
Research
$12,819
3 transactions
Top Paying Companies
| Company | Total | Records | Latest Year |
|---|---|---|---|
| Alcon Vision LLC | $27,795 | 124 | $0 (2024) |
| Alcon Research LLC | $13,723 | 9 | $0 (2024) |
| F. Hoffmann-La Roche AG | $12,819 | 3 | $0 (2022) |
| Sight Sciences, Inc. | $12,782 | 32 | $0 (2024) |
| Allergan, Inc. | $10,693 | 19 | $0 (2020) |
| Aerie Pharmaceuticals, Inc. | $5,653 | 14 | $0 (2021) |
| Carl Zeiss Meditec, Inc. | $3,381 | 3 | $0 (2024) |
| Iridex Corporation | $3,324 | 7 | $0 (2022) |
| Alcon Laboratories Inc | $3,010 | 10 | $0 (2018) |
| Ivantis, Inc | $2,949 | 7 | $0 (2021) |
Payment History by Year
| Year | Amount | Transactions | Top Company |
|---|---|---|---|
| 2024 | $38,390 | 76 | Alcon Vision LLC ($18,461) |
| 2023 | $11,988 | 49 | Alcon Vision LLC ($5,441) |
| 2022 | $17,190 | 49 | F. Hoffmann-La Roche AG ($8,909) |
| 2021 | $14,528 | 42 | F. Hoffmann-La Roche AG ($3,910) |
| 2020 | $4,214 | 11 | Aerie Pharmaceuticals, Inc. ($3,792) |
| 2019 | $11,524 | 20 | Allergan Inc. ($6,212) |
| 2018 | $5,173 | 23 | Allergan Inc. ($4,206) |
| 2017 | $4,938 | 18 | Alcon Laboratories Inc ($2,885) |
All Payment Transactions
288 individual payment records from CMS Open Payments — Page 1 of 12
| Date | Company | Product | Nature | Form | Amount | Type |
|---|---|---|---|---|---|---|
| 12/24/2024 | Sight Sciences, Inc. | OMNI SURGICAL SYSTEM (Device) | Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program | Cash or cash equivalent | $3,000.00 | General |
| Category: Ophthalmology | ||||||
| 12/12/2024 | Alcon Vision LLC | HYDRUS Microstent (Device) | Food and Beverage | In-kind items and services | $9.08 | General |
| Category: Ophthalmology | ||||||
| 12/11/2024 | Glaukos Corporation | iDose (Device) | Food and Beverage | Cash or cash equivalent | $83.25 | General |
| Category: Glaucoma | ||||||
| 11/16/2024 | ABBVIE INC. | XEN GLAUCOMA TREATMENT SYSTEM (Device) | Food and Beverage | In-kind items and services | $32.73 | General |
| Category: EYE CARE | ||||||
| 11/15/2024 | Alcon Vision LLC | — | Food and Beverage | In-kind items and services | $140.06 | General |
| Category: Ophthalmology | ||||||
| 11/12/2024 | Alcon Vision LLC | HYDRUS Microstent (Device) | Food and Beverage | In-kind items and services | $10.94 | General |
| Category: Ophthalmology | ||||||
| 11/07/2024 | Alcon Vision LLC | — | Consulting Fee | Cash or cash equivalent | $1,000.00 | General |
| Category: Ophthalmology | ||||||
| 10/30/2024 | Glaukos Corporation | — | Consulting Fee | Cash or cash equivalent | $1,200.00 | General |
| 10/30/2024 | Alcon Vision LLC | Rocklatan (Drug) | Food and Beverage | In-kind items and services | $11.79 | General |
| Category: Ophthalmology | ||||||
| 10/24/2024 | Alcon Research LLC | NGENUITY (Device) | Consulting Fee | Cash or cash equivalent | $1,000.00 | General |
| Category: Ophthalmology | ||||||
| 10/19/2024 | Tarsus Pharmaceuticals, Inc. | — | Food and Beverage | In-kind items and services | $184.78 | General |
| 10/17/2024 | Sight Sciences, Inc. | OMNI SURGICAL SYSTEM (Device) | Food and Beverage | In-kind items and services | $123.93 | General |
| Category: Ophthalmology | ||||||
| 10/16/2024 | Alcon Vision LLC | Clareon (Device) | Food and Beverage | In-kind items and services | $12.70 | General |
| Category: Ophthalmology | ||||||
| 10/09/2024 | Glaukos Corporation | iStent Trabecular Micro-Bypass System Model iS3 (Device) | Food and Beverage | Cash or cash equivalent | $92.88 | General |
| Category: Glaucoma | ||||||
| 10/09/2024 | Glaukos Corporation | iStent Trabecular Micro-Bypass System Model iS3 (Device) | Food and Beverage | Cash or cash equivalent | $25.10 | General |
| Category: Glaucoma | ||||||
| 10/09/2024 | Alcon Vision LLC | HYDRUS Microstent (Device) | Food and Beverage | In-kind items and services | $17.54 | General |
| Category: Ophthalmology | ||||||
| 10/09/2024 | Alcon Vision LLC | Rocklatan (Drug) | Food and Beverage | In-kind items and services | $5.55 | General |
| Category: Ophthalmology | ||||||
| 09/25/2024 | Alcon Vision LLC | ARGOS (Device) | Food and Beverage | In-kind items and services | $11.05 | General |
| Category: Ophthalmology | ||||||
| 08/28/2024 | Carl Zeiss Meditec USA, Inc. | CIRRUS HD-OCT (Device) | Food and Beverage | In-kind items and services | $122.97 | General |
| Category: Optical Tomography | ||||||
| 08/27/2024 | Sight Sciences, Inc. | OMNI SURGICAL SYSTEM (Device) | Food and Beverage | In-kind items and services | $45.58 | General |
| Category: Ophthalmology | ||||||
| 08/22/2024 | Alcon Vision LLC | HYDRUS Microstent (Device) | Food and Beverage | In-kind items and services | $130.71 | General |
| Category: Ophthalmology | ||||||
| 08/14/2024 | Alcon Vision LLC | HYDRUS Microstent (Device) | Food and Beverage | In-kind items and services | $68.07 | General |
| Category: Ophthalmology | ||||||
| 07/24/2024 | Alcon Vision LLC | HYDRUS Microstent (Device) | Food and Beverage | In-kind items and services | $43.14 | General |
| Category: Ophthalmology | ||||||
| 07/17/2024 | Biogen, Inc. | BYOOVIZ (Biological) | Food and Beverage | In-kind items and services | $53.89 | General |
| Category: Ophthalmology | ||||||
| 07/12/2024 | Alcon Vision LLC | HYDRUS Microstent (Device) | Food and Beverage | In-kind items and services | $136.23 | General |
| Category: Ophthalmology | ||||||
Research Studies & Clinical Trials
| Study Name | Company | Amount | Records |
|---|---|---|---|
| MANAGEMENT OF OCULAR ADVERSE EVENTS OF SPECIAL INTEREST IN PATIENTS IMPLANTED WITH THE PORT DELIVERY SYSTEM WITH RANIBIZUMAB PDS | F. Hoffmann-La Roche AG | $12,819 | 3 |
Medicare Billing by Year
| Year | Procedures | Beneficiaries | Services | Submitted | Medicare Paid |
|---|---|---|---|---|---|
| 2023 | 22 | 2,034 | 2,356 | $1.4M | $227,544 |
| 2022 | 21 | 1,866 | 2,223 | $1.2M | $190,895 |
| 2021 | 22 | 2,266 | 2,720 | $1.5M | $252,797 |
| 2020 | 18 | 1,674 | 2,090 | $1.1M | $170,258 |
Total Patients
7,840
Total Services
9,389
Medicare Billing
$841,494
Procedure Codes
83
All Medicare Procedures & Services
83 procedure records from CMS Medicare Utilization — Page 1 of 4
| HCPCS | Description | Setting | Year | Patients | Services | Charges | Medicare Paid | Ratio |
|---|---|---|---|---|---|---|---|---|
| 66984 | Removal of cataract with insertion of prosthetic lens | Facility | 2023 | 57 | 71 | $366,786 | $36,276 | 9.9% |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | Office | 2023 | 283 | 377 | $44,332 | $30,289 | 68.3% |
| 66982 | Complex removal of cataract with insertion of prosthetic lens | Facility | 2023 | 30 | 40 | $255,000 | $29,065 | 11.4% |
| 66180 | Creation of shunt to improve eye fluid flow using tissue graft | Facility | 2023 | 19 | 21 | $157,500 | $23,191 | 14.7% |
| 66991 | Extracapsular removal of cataract with insertion of artificial lens and insertion of drainage device in front chamber of eye | Facility | 2023 | 26 | 34 | $281,476 | $22,804 | 8.1% |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | Office | 2023 | 261 | 366 | $29,409 | $19,677 | 66.9% |
| 66821 | Removal of recurring cataract in lens capsule using a laser | Office | 2023 | 43 | 45 | $55,796 | $14,033 | 25.1% |
| 99215 | Established patient office or other outpatient visit, 40-54 minutes | Office | 2023 | 86 | 95 | $17,113 | $11,278 | 65.9% |
| 92083 | Exam of visual field with extended testing | Office | 2023 | 295 | 340 | $62,089 | $8,172 | 13.2% |
| 92133 | Imaging of optic nerve | Office | 2023 | 320 | 327 | $23,986 | $6,180 | 25.8% |
| 92014 | Established patient complete exam of visual system | Office | 2023 | 79 | 80 | $18,800 | $5,521 | 29.4% |
| 99204 | New patient office or other outpatient visit, 45-59 minutes | Office | 2023 | 50 | 50 | $9,100 | $5,520 | 60.7% |
| 65855 | Laser repair to improve eye fluid flow | Office | 2023 | 16 | 21 | $21,000 | $3,952 | 18.8% |
| 92136 | Measurement of corneal curvature and depth of eye | Office | 2023 | 100 | 102 | $14,352 | $2,880 | 20.1% |
| 92025 | Ct scan of cornea | Office | 2023 | 110 | 117 | $9,440 | $2,139 | 22.7% |
| 92004 | New patient complete exam of visual system | Office | 2023 | 22 | 22 | $7,138 | $1,744 | 24.4% |
| 92134 | Imaging of retina | Office | 2023 | 66 | 77 | $5,980 | $1,672 | 28.0% |
| 92020 | Exam of the internal drainage system of eye | Office | 2023 | 67 | 67 | $6,432 | $1,216 | 18.9% |
| 92012 | Established patient problem focused exam of visual system | Office | 2023 | 23 | 23 | $3,611 | $1,026 | 28.4% |
| 76514 | Ultrasound scan of cornea to determine thickness | Office | 2023 | 54 | 54 | $2,723 | $382.72 | 14.1% |
| 92250 | Photography of the retina | Office | 2023 | 15 | 15 | $4,364 | $281.40 | 6.4% |
| 92286 | Imaging of front third of eye using a special microscope | Office | 2023 | 12 | 12 | $1,592 | $245.76 | 15.4% |
| 66984 | Removal of cataract with insertion of prosthetic lens | Facility | 2022 | 65 | 89 | $459,774 | $44,876 | 9.8% |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | Office | 2022 | 283 | 408 | $50,420 | $31,095 | 61.7% |
| 66982 | Complex removal of cataract with insertion of prosthetic lens | Facility | 2022 | 29 | 31 | $197,625 | $21,585 | 10.9% |
About Dr. Robert Chang, MD
Dr. Robert Chang, MD is a Ophthalmology healthcare provider based in Stanford, California. This provider has been registered with the National Plan and Provider Enumeration System (NPPES) since 10/05/2006. The National Provider Identifier (NPI) number assigned to this provider is 1417044280.
According to the Centers for Medicare & Medicaid Services (CMS) Open Payments database, Dr. Robert Chang, MD has received a total of $107,945 in payments from pharmaceutical and medical device companies, with $38,390 received in 2024. These payments were reported across 288 transactions from 28 companies. The most common payment nature is "Consulting Fee" ($63,827).
As a Medicare-enrolled provider, Chang has provided services to 7,840 Medicare beneficiaries, totaling 9,389 services with total Medicare billing of $841,494. Data is available for 4 years (2020–2023), covering 83 distinct procedure/service records.
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Practice Information
- Specialty Ophthalmology
- Other Specialties Ophthalmology, Ophthalmology
- Location Stanford, CA
- Active Since 10/05/2006
- Last Updated 03/18/2024
- Taxonomy Code 207W00000X
- Entity Type Individual
- NPI Number 1417044280
Products in Payments
- HYDRUS Microstent (Device) $21,572
- Lucentis (Biological) $12,819
- NGENUITY (Device) $11,892
- OMNI SURGICAL SYSTEM (Device) $7,397
- XEN (Device) $6,491
- OMNI(R) SURGICAL SYSTEM (US) (Device) $4,625
- ALPHAGAN P (Drug) $3,928
- rhopressa (Drug) $3,781
- CIRRUS HD-OCT (Device) $3,315
- Hydrus Microstent (Device) $2,949
- ORA (Device) $2,308
- OMIDRIA (Drug) $1,564
- GENERAL FEMALE SUI (Device) $1,547
- ARTEVO 800 (Device) $1,345
- Rhopressa (Drug) $962.62
- Rocklatan (Drug) $760.80
- OMNI (Device) $678.10
- Centurion (Device) $595.20
- AcrySof IQ PanOptix (Device) $589.59
- DEXTENZA (Drug) $397.96
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Data Sources
Provider data from NPPES. Payment data from CMS Open Payments. Medicare data from CMS Medicare Provider Utilization. All data is public and updated periodically.
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