What is Louis Chang's specialty?

Louis Chang (NPI 1538295720) is a Medicare-billing provider whose primary specialty is Ophthalmology in Los Angeles, CA.

Where does Louis Chang practice?

Louis Chang practices in Los Angeles, CA, based on the location reported in the CMS Medicare provider datasets for NPI 1538295720.

How much does Medicare pay Louis Chang?

Louis Chang (NPI 1538295720) received approximately $2.3M in total Medicare Part B payments, serving 660 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1538295720

Louis ChangM.D., PH.D.

PRACTICEJULES STEIN EYE INSTITUTE MEDICAL GROUPSee all providers at this practice →

OphthalmologyLos Angeles, CAI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

2,497

Unique beneficiaries

—

Total services

23,553

Distinct HCPCS

Medicare payment

$2.3M

Peer benchmark

Total Medicare services vs. 2,144 Ophthalmology providers in CA — top quintile (cohort median 1,859).

PRESCRIBING · PART D · 2024

Total Rx claims

169

Beneficiaries

—

Total drug cost

$4K

Distinct drugs

Brand share

14.8%

Top prescribed drugs

Prednisolone Acetate63 claims

Ketorolac Tromethamine34 claims

Diclofenac Sodium31 claims

Neomycin/Polymyxin B/Dexametha25 claims

Brimonidine Tartrate16 claims

QUALITY · MIPS · 2024

Final MIPS score

100.0

Quality

100.0

Cost

0.0

Improvement activities

40.0

Promoting interop.

0.0

Payment adjustment

1.05%

Group

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2024

Total received

$89

Payment records

By payment type

Food and Beverage$89

Top paying entities

Food and Beverage$89

REFERRAL NETWORK

Where Louis Chang's patients come from & go

Directional shared-patient flow from Medicare claims — who sends patients to this provider (inbound) and where this provider's patients go next (outbound). 6 inbound referrers · 0 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
SETON MEDICAL CENTER	17	58
Jon Keller Pathology · Palo Alto, CA	17	75
Claudio Contreras Ophthalmology · San Jose, CA	15	49
Edmund Tai Hematology-Oncology · Mountain View, CA	13	47
EL CAMINO HOSPITAL	12	18
GOOD SAMARITAN HOSPITAL, L.P.	11	26

Refers patients to

Outbound — where patients go next

No outbound pairs above the suppression threshold.

Source: CMS Physician Shared Patient Patterns (30-day window, Medicare FFS). Direction = a beneficiary seen by the first provider, then the second, within 30 days; a proxy for referral, not a documented referral. Pairs with fewer than 11 shared beneficiaries are suppressed.

CROSS-REFERENCE

Related data on other Healthparse brands

ProviderScore

OIG/SAM exclusion screening, sanctions history