Why are Medicare and Medicaid shown separately instead of combined?

They come from two different CMS data sources with no shared claim identifier, so they can't be reconciled into one number without double-counting or guessing. Every table and chart on this page keeps them fully separate.

Why is there no private/commercial revenue figure?

Private and commercial payer data comes from Transparency in Coverage files, which only publish negotiated rates — not claims or utilization volume. Without a volume figure, no revenue number can be computed for any provider from that data.

What does "Rank" mean in the Competitive Analysis & Benchmarks tables?

For a given CPT/HCPCS code, it's this provider's position by claims volume among all providers billing that same code at that geography level (State, National, or California for Medicaid) — rank 1 means the highest claims volume for that code.

Why is the Medicaid comparison limited to California only?

Medicaid is administered per-state with no single national fee schedule, so a state or national comparison the way Medicare has one isn't available. California (this provider's own state) is the only grouping that's conceptually meaningful.

Why are the numbers rounded to the nearest 10?

To avoid implying more precision than the underlying data supports at a single-provider level. Ratios are kept precise since they're a relative comparison, not a volume or dollar figure.

How current is this data?

The Medicare and Medicaid tables are both single current snapshots, not refreshed on a recurring schedule yet.

David Chang (NPI 1316966138)

Field	Value
Entity Type	Individual
Organization	David Chang
Address	762 Altos Oaks Dr
City	Los Altos
State	CA
ZIP	94024
Taxonomy	Ophthalmology Physician
NPI Enumerated	July 19, 2006

Payer Source	Total Paid
Medicare	$755.7K
Medicaid	$0

Medicare: Complete Services Breakdown

The CPT/HCPCS codes generating the most Medicare revenue for this provider.

8 rows

CPT/HCPCS Code	Description	Claims	Avg Paid	Revenue
66984	The provider inserts an artificial lens after removing an extracapsular cataract by aspiration or use of ultrasonic waves. This procedure is done without the use of an endoscopic laser probe to…	970	$500	$485.4K
92004	The provider performs a comprehensive level ophthalmological evaluation of a new patient and initiates a diagnostic and treatment program for one or more visits.	700	$130	$88.9K
66982	The provider inserts an intraocular lens prosthesis after extracapsular cataract extraction using complex techniques and devices. He may perform this by means of an iris expansion device, providing…	110	$680	$75.8K
92136	The provider uses a noninvasive method to measure the patient’s eye or eyes to get information that the provider then uses to calculate the appropriate power for an intraocular lens (IOL). Selecting…	1,210	$40	$43.5K
66821	The provider removes the haziness from the capsule of the eye using a laser for a patient with a secondary membranous cataract.	110	$300	$32.7K
92014	An ophthalmologist sees an established patient for a comprehensive level eye examination. Generally, a patient is considered to be "established" if the same physician, or any physician in the group…	160	$110	$16.3K
66991	The provider inserts an intraocular lens prosthesis during the same session as extracapsular cataract extraction. The provider also inserts one or more anterior segment aqueous drainage devices in…	20	$620	$10.6K
92134	The provider performs computerized diagnostic imaging of the retina in the posterior segment (back part) of the eye, interprets the data, and provides a report. The service may be on one or both eyes.	70	$30	$2.2K

Medicare: Competitive Analysis & Benchmarks

How this provider's Medicare billing volume and revenue compare to other providers nationally and within its state, across 8 CPT/HCPCS codes.

View: State1 / 2

Claims Volume vs. California Distribution

David Chang — 4 of 8 codes billed far more than typical (above p95)

p5–p95 (all providers)p25–p75MedianThis providerOutlier

Rank Distribution — California

Full comparison — all codes billed, vs. state median

8 rows

CPT/HCPCS Code	Rank	Provider Count	Median Claims	Avg Paid	Average Revenue
66984	27	1,250	90	$690	$122.8K
66991	157	180	30	$1,940	$77.7K
66982	25	510	30	$800	$32K
92014	1,211	2,890	110	$100	$28.7K
66821	145	950	40	$270	$18.4K
92134	1,251	2,150	90	$30	$12.6K
92004	21	1,950	50	$110	$9.7K
92136	2	920	100	$30	$4.8K

Related Providers

Other providers that share a Tax Identification Number (TIN) with David Chang, ranked by combined Medicare and Medicaid revenue.

Provider	State	Taxonomy	Medicare Revenue	Medicaid Revenue
Thomas Schlesinger	CA	Retina Specialist (Ophthalmology) Physician	$4.3M	$7.9M
Shalini Yalamanchi	CA	Ophthalmology Physician	$4.6M	$7.2M
Stephen Meffert	CA	Retina Specialist (Ophthalmology) Physician	$3.2M	$5.5M
Louis Chang	CA	Ophthalmology Physician	$2.2M	$5.9M
Matthew Powers	CA	Retina Specialist (Ophthalmology) Physician	$3.7M	$4.3M
Ira Schachar	CA	Retina Specialist (Ophthalmology) Physician	$3.9M	$4.1M
Alok Bansal	CA	Ophthalmology Physician	$3M	$4.7M
Khosrow Mehrany	CA	Specialist	$7.7M	$0
Jon Keller	CA	Anatomic Pathology & Clinical Pathology Physician	$6.4M	$0
Min-wei Lee	CA	Dermatology Physician	$390.1K	$5.1M

Nearby Providers

Other providers in the same ZIP code as David Chang, ranked by combined Medicare and Medicaid revenue.

Provider	State	Taxonomy	Medicare Revenue	Medicaid Revenue
Hardeep Ahluwalia	CA	Vascular Surgery Physician	$2.7M	$0
Bryan Lee	CA	Ophthalmology Physician	$445.4K	$0
Jeffrey Kliman	CA	Orthopaedic Surgery Physician	$264.5K	$0
Sutter Bay Medical Foundation	CA	Ambulatory Surgical Clinic/Center	$81.7K	$0

David Chang — Billing Profile & Reimbursement Data

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David Chang — Billing Profile & Reimbursement Data

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Medicare: Total Revenue Breakdown by CPT/HCPCS Code

Medicare: Complete Services Breakdown

Medicare: Competitive Analysis & Benchmarks

Related Providers

Nearby Providers

Frequently Asked Questions

References