Doctor profile · Federal record
Dr. Robert Chang, MD
Glaucoma Specialist (Ophthalmology) Physician (CMS: Ophthalmology) · Ophthalmology Physician · Ophthalmology Physician · Ophthalmology Physician · Stanford, CA
- NPI 1417044280
- Accepts Medicare
- MIPS 75.5 / 100 · 2023
- 24 yrs in practice
- Licensed in 3 states
- Male
- Group practice
- No sanctions
Practice & contact
Operates at 2 locations .
- Primary practice
-
300 Pasteur Dr
Stanford, CA 943052200
(650) 723-4000 - Additional location
-
900 Blake Wilbur Dr, Rm W3002
Palo Alto, CA 943042201
(650) 723-6995
Credentials & registration
- NPI registered
- October 2006 — 20 yrs on file
- Profile last updated
- March 18, 2024
- Year of graduation
- 2002 — 24 yrs since
- Specialty taxonomy
- 207WX0009X — NUCC code
- State licenses (3)
- California #A108857 · Missouri #2004011762 · Florida #ME99224
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1417044280. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
2,356
Distinct HCPCS
10
Medicare allowed
$299,430
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 377 | 283 | $113 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 366 | 261 | $76 | |
92083 |
Exam of visual field with extended testing | 340 | 295 | $32 | |
92133 |
Imaging of optic nerve | 327 | 320 | $25 | |
92025 |
Ct scan of cornea | 117 | 110 | $23 | |
92136 |
Measurement of corneal curvature and depth of eye | 102 | 100 | $36 | |
99215 |
Established patient office or other outpatient visit, 40-54 minutes | 95 | 86 | $165 | |
92014 |
Established patient complete exam of visual system | 80 | 79 | $91 | |
92134 |
Imaging of retina | 77 | 66 | $30 | |
66984 |
Removal of cataract with insertion of prosthetic lens | 71 | 57 | $655 |
In context: peer comparison
Among 3 peers in Stanford Glaucoma Specialist (Ophthalmology) Physician, average services per provider: 82. This provider delivers 29× the peer median.Open Payments
Industry payments received
All-time total
$38,390
Transactions
76
Manufacturers
11
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Alcon Vision LLC | 48 | $18,461.31 | |
| Alcon Research LLC | 7 | $11,728.10 | |
| Sight Sciences, INC. | 5 | $3,364.46 | |
| Carl Zeiss Meditec, INC. | 1 | $2,600.00 | |
| Glaukos Corporation | 5 | $1,523.86 | |
| Tarsus Pharmaceuticals, INC. | 2 | $203.96 | |
| Carl Zeiss Meditec USA, INC. | 2 | $157.27 | |
| Bausch & Lomb Americas INC. | 1 | $139.28 | |
| Oyster Point Pharma, INC. | 1 | $81.36 | |
| Abbvie INC. | 3 | $76.89 | |
| Biogen, INC. | 1 | $53.89 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
1,324
Patients
518
Total drug cost
$250,046
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Latanoprost | Generic | 398 | 119 | $6,519 |
| Prednisolone Acetate | Generic | 143 | 110 | $6,426 |
| Timolol Maleate | Generic | 124 | 54 | $2,777 |
| Restasis (Cyclosporine) | Brand | 102 | 33 | $83,230 |
| Dorzolamide-Timolol (Dorzolamide Hcl/Timolol Maleat) | Brand | 73 | 22 | $2,254 |
| Lumigan (Bimatoprost) | Brand | 63 | 17 | $27,664 |
| Brimonidine Tartrate | Generic | 55 | 22 | $1,818 |
| Rhopressa (Netarsudil Mesylate) | Brand | 54 | 17 | $27,626 |
| Tafluprost (Tafluprost/Pf) | Brand | 52 | 12 | $7,384 |
| Rocklatan (Netarsudil Mesylat/Latanoprost) | Brand | 47 | 12 | $28,906 |
Hospital affiliations
Frequently asked questions
What is Dr. Robert Chang's medical specialty?
Dr. Robert Chang practices Glaucoma Specialist (Ophthalmology) Physician in Stanford, CA.
Where does Dr. Robert Chang practice?
Dr. Robert Chang practices at 300 Pasteur Dr, Stanford, CA 943052200. Office phone: 6507234000.
What is Dr. Robert Chang's NPI?
Dr. Robert Chang's National Provider Identifier (NPI) is 1417044280, issued by NPPES.
Does Dr. Robert Chang accept Medicare assignment?
Yes. Dr. Robert Chang accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Robert Chang commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99214); Established patient office or other outpatient visit (HCPCS 99213); Exam of visual field with extended testing (HCPCS 92083). Source: CMS Medicare Physician & Other Practitioners file.