Medicare Enrolled
Dr. Ku-Juey Raymond Chang, M.D.
Nephrology · Lake Forest, CA
Practice pattern: Mixed Practice
— Diverse clinical practice across multiple procedure types
Speaking/Promotional
Very High
DATA COVERAGE
Data in 4 of 4 federal sources
Measures public federal data availability — not provider quality
Informational, not a quality rating.
This page presents federal public records about Dr. Chang from CMS (NPPES, Open Payments, Medicare Provider Utilization, PECOS). It is not medical advice, an endorsement, or a judgment of clinical quality. Always consult the provider directly and a licensed clinician for medical decisions. Read methodology →
Are you Dr. Chang?
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What this data tells you about Dr. Chang
Dr. Ku-Juey Raymond Chang is a nephrology specialist in Lake Forest, CA, with 19 years of NPI registration. Based on federal Medicare data, Dr. Chang performed 22,798 Medicare services across 11,021 unique beneficiaries.
Between the years covered by Open Payments, Dr. Chang received a total of $369,942 from 81 pharmaceutical and/or device companies across 1227 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in nephrology. The majority of payments are for speaking programs and promotional activities, reflecting participation in industry-sponsored events. Patients may wish to discuss these relationships with their provider.
The Data Coverage level for Dr. Chang is Very High — reflecting how much public federal data is available about this provider. Patients are encouraged to use this data as one of several factors when choosing a healthcare provider.
✓ 19 years in practice
▲ Top 1% volume in CA
$369,942 industry payments
Medicare Practice Summary
Medicare Utilization ↗22,798
Medicare services
Top 1% in CA for nephrology
11,021
Unique beneficiaries
$19
Avg. Medicare payment
Medicare patients only (65+ / disabled) · How to read this →
~1,200 Medicare services per year of practice
Top procedures by volume
Ranked by number of services performed for Medicare patients. Avg. submitted charge is what the provider billed; avg. Medicare payment is what CMS paid.
| Procedure | Volume | Avg. paid | Avg. submitted |
|---|---|---|---|
| Office visit, established patient (30-39 min) A follow-up office visit for an existing patient lasting between 30 and 39 minutes. The visit involves medical evaluation and management of the patient's condition. |
910 | $96 | $262 |
| Blood draw (venipuncture) Insertion of a needle into a vein to collect a blood sample. |
890 | $8 | $20 |
| Basic metabolic blood panel A blood test that measures a group of basic chemicals, including total calcium levels. |
872 | $8 | $42 |
| Magnesium level test A blood test to measure the amount of magnesium in your body. This helps check for magnesium deficiency or excess. |
869 | $7 | $38 |
| Phosphate level test A blood test that measures the amount of phosphate in your body. Phosphate is a mineral that helps keep bones and teeth strong. |
867 | $5 | $33 |
| Complete blood count (CBC) with differential An automated laboratory test that measures the levels of red blood cells, white blood cells, and platelets in the blood, including a breakdown of the different types of white blood cells. |
862 | $8 | $30 |
| Liver function blood test panel | 858 | $8 | $41 |
| Uric acid level test A blood test that measures the level of uric acid in your body. Uric acid is a waste product formed when the body breaks down purines. |
856 | $4 | $21 |
| Chronic care management, first 20 min/month This service covers the first 20 minutes of clinical staff time directed by a healthcare professional each calendar month to manage chronic conditions. |
851 | $51 | $124 |
| Cardiac enzyme level (CK-MB) test A blood test that measures the total level of creatine kinase, specifically the cardiac enzyme fraction, to help evaluate heart muscle damage. |
807 | $6 | $21 |
| Ferritin level test (iron stores) A blood test that measures the level of ferritin, a protein that stores iron in the body. |
784 | $13 | $45 |
| Iron level test | 784 | $6 | $21 |
| Iron binding capacity test A blood test that measures the amount of iron in the blood and the blood's ability to bind and transport iron. |
784 | $8 | $29 |
| Parathyroid hormone level test A blood test that measures the amount of parathyroid hormone in your body. This hormone helps regulate calcium levels in the blood and bones. |
762 | $40 | $132 |
| Vitamin D level test A blood test to measure the amount of Vitamin D-3 in your body. |
739 | $29 | $95 |
| Free thyroxine (T4) test A blood test that measures the level of free thyroxine, a thyroid hormone, in the bloodstream. |
739 | $9 | $60 |
| Total T3 thyroid hormone test A blood test that measures the total amount of triiodothyronine (T3) hormone in your body. T3 is a thyroid hormone that helps regulate metabolism and energy levels. |
739 | $14 | $45 |
| Hemoglobin A1c test (diabetes monitoring) A blood test that measures your average blood sugar levels over the past two to three months. |
738 | $9 | $32 |
| Thyroid stimulating hormone (TSH) test A blood test that measures the level of thyroid stimulating hormone to evaluate thyroid function. |
737 | $16 | $54 |
| Vitamin B-12 level test A blood test that measures the amount of vitamin B-12 in your body. |
717 | $15 | $53 |
| Folic acid level test A blood test that measures the amount of folic acid in the serum. |
706 | $14 | $47 |
| Microsomal antibody test A blood test that measures the level of microsomal antibodies, which are autoantibodies produced by the immune system. |
674 | $14 | $90 |
| C-peptide level test A blood test that measures the amount of C-peptide, a protein produced along with insulin, to help evaluate insulin production and diabetes management. |
610 | $20 | $66 |
| Total testosterone level test A blood test that measures the total amount of testosterone in your body. This hormone is important for various bodily functions in both men and women. |
568 | $25 | $83 |
| Sex hormone binding globulin level test A blood test that measures the level of sex hormone binding globulin, a protein that binds to sex hormones in the bloodstream. |
567 | $21 | $40 |
| Total cortisol level test A blood test that measures the total amount of cortisol hormone in your body. Cortisol is a hormone produced by the adrenal glands. |
405 | $16 | $60 |
| Total estradiol level test A blood test that measures the total amount of estradiol, a form of estrogen, in the body. |
395 | $27 | $85 |
| Follicle stimulating hormone (FSH) level A blood test to measure the level of follicle stimulating hormone, a reproductive hormone. |
394 | $18 | $83 |
| Luteinizing hormone level test A blood test that measures the level of luteinizing hormone, a reproductive hormone. This test helps evaluate hormonal balance and reproductive function. |
394 | $18 | $83 |
| Lipid panel (cholesterol and triglycerides) A blood test that measures cholesterol and triglyceride levels. |
327 | $13 | $51 |
| Urine microalbumin test (kidney screening) A laboratory test that measures the amount of microalbumin, a small protein, in a urine sample. This test is used to detect early signs of kidney damage. |
241 | $6 | $11 |
| Creatinine test (kidney function) A blood test that measures the amount of creatinine to assess kidney function or detect muscle injury. |
241 | $5 | $10 |
| Blood glucose test using hand-held instrument A test that measures the level of sugar in the blood using a portable device. The result helps monitor blood glucose levels. |
224 | $3 | $5 |
| COVID-19 antibody test A blood test that measures antibodies to severe acute respiratory syndrome coronavirus 2 (COVID-19). It detects the presence of immune response markers to the virus. |
187 | $41 | $76 |
| Flu vaccine administration This procedure involves the administration of the influenza virus vaccine. It covers the process of delivering the vaccine to the patient. |
103 | $23 | $24 |
| Chronic care management, additional 20 min/month This service covers an extra 20 minutes of clinical staff time directed by a healthcare professional for managing two or more chronic conditions each calendar month. |
96 | $40 | $101 |
| Quadrivalent influenza vaccine, cell-culture derived A flu shot containing four strains of influenza virus, produced using cell culture technology rather than eggs. This formulation is free from preservatives and antibiotics. |
95 | $33 | $112 |
| Urinalysis with microscopic exam A urine test performed manually that includes examining the sample under a microscope to check for abnormalities. |
78 | $3 | $10 |
| Progesterone level test A blood test that measures the amount of progesterone, a reproductive hormone, in your body. |
60 | $20 | $75 |
| Complete ultrasound of retroperitoneum An ultrasound examination of the structures located behind the abdominal cavity. |
55 | $90 | $244 |
| PSA test (prostate cancer screening) | 53 | $18 | $34 |
| Ultrasound of head and neck soft tissue This procedure uses sound waves to create images of the soft tissues in the head and neck area. It allows for the visualization of structures beneath the skin without using radiation. |
48 | $88 | $252 |
| New patient office visit (45-59 min) An initial office visit for a new patient lasting between 45 and 59 minutes. This code covers the total time spent by the physician or qualified healthcare professional on the date of the encounter. |
33 | $138 | $339 |
| Drug injection, under skin or into muscle A procedure involving the administration of a medication or substance via injection into the subcutaneous tissue or muscle. |
29 | $12 | $38 |
| Annual wellness visit, follow-up A follow-up annual wellness visit that includes a personalized prevention plan of service. |
25 | $140 | $280 |
| Vitamin B-12 injection An injection of vitamin B-12 (cyanocobalamin) with a dose of up to 1000 mcg. |
25 | $1 | $12 |
How to read this data: This reflects Medicare patients only (typically 65+). Payment amounts are what Medicare paid the provider, not your out-of-pocket cost. A higher procedure volume generally indicates more experience with that procedure.
Industry Payment Transparency
Open Payments through 2024 ↗$369,942
Total received (2018-2024)
Avg $52,849/year across 7 years
Top 1% in CA for nephrology
A higher payment rank reflects disclosed industry relationships (consulting, research, speaking) common among subspecialists — not wrongdoing.
81
Companies
1,227
Individual payments
All payments are legal and publicly reported · Not evidence of wrongdoing · How to interpret →
Payment profile
Industry payments classified by relationship type. Not all payments are equal — research and consulting reflect different relationships than speaking programs or meals.
Speaking / Promotional
Speaker programs, honoraria, and industry-sponsored educational events
$355,168 (96.0%)
Meals & Travel
Food, beverages, travel, and lodging — typically low-value
$13,874 (3.8%)
Consulting
Expert advisory fees, typically reflecting recognized clinical expertise
$900 (0.2%)
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
2024
$87,420
2023
$73,499
2022
$45,604
2021
$53,230
2020
$29,519
2019
$42,678
2018
$37,992
Payments by company (2024)
Consulting
Speaking
Meals & Travel
Research
Lilly USA, LLC
$50,444
Boehringer Ingelheim Pharmaceuticals, Inc.
$34,284
Amgen Inc.
$873
ABBVIE INC.
$303
Bayer Healthcare Pharmaceuticals Inc.
$238
Novartis Pharmaceuticals Corporation
$211
CeQur Corporation
$143
Dexcom, Inc.
$122
Corcept Therapeutics
$94
Embecta Corp.
$93
Novo Nordisk Inc
$90
SANOFI-AVENTIS U.S. LLC
$78
CALLIDITAS THERAPEUTICS US INC.
$76
Verity Pharmaceuticals Inc.
$65
Travere Therapeutics, Inc.
$57
Madrigal Pharmaceuticals
$43
Inari Medical, Inc.
$38
Otsuka America Pharmaceutical, Inc.
$36
Mallinckrodt Hospital Products Inc.
$35
SCILEX PHARMACEUTICALS INC.
$21
Alexion Pharmaceuticals, Inc.
$18
Mannkind Corporation
$16
Rhythm Pharmaceuticals, Inc.
$15
Antares Pharma, Inc.
$13
Currax Pharmaceuticals LLC
$13
Top 3 companies account for 97.9% of 2024 payments
All-time payments by company (2018-2024) ›
Boehringer Ingelheim Pharmaceuticals, Inc.
$189,048
Lilly USA, LLC
$148,037
Esperion Therapeutics, Inc.
$16,213
Amgen Inc.
$2,398
CeQur Corporation
$2,367
AbbVie Inc.
$1,307
AstraZeneca Pharmaceuticals LP
$873
ABBVIE INC.
$781
Novo Nordisk Inc
$603
SANOFI-AVENTIS U.S. LLC
$600
Corcept Therapeutics
$591
Janssen Pharmaceuticals, Inc
$579
Novartis Pharmaceuticals Corporation
$556
Bayer HealthCare Pharmaceuticals Inc.
$462
Bayer Healthcare Pharmaceuticals Inc.
$441
Biohaven Pharmaceutical Holding Company Ltd.
$409
Amarin Pharma Inc.
$364
Dexcom, Inc.
$313
AbbVie, Inc.
$253
Alexion Pharmaceuticals, Inc.
$230
Travere Therapeutics, Inc.
$217
Merck Sharp & Dohme Corporation
$177
OPKO Pharmaceuticals, LLC
$156
Abbott Laboratories
$150
CALLIDITAS THERAPEUTICS US INC.
$145
Calliditas Therapeutics US Inc.
$136
Valeritas, Inc.
$133
Bigfoot Biomedical Inc
$125
Endo Pharmaceuticals Inc.
$109
Zealand Pharma US, Inc.
$108
Embecta Corp.
$106
Otsuka America Pharmaceutical, Inc.
$96
Mannkind Corporation
$93
Mallinckrodt Hospital Products Inc.
$91
ZOLL Services LLC (A/K/A ZOLL LifeCor Corp)
$88
Relypsa, Inc.
$88
Exeltis, USA Inc.
$82
Xeris Pharmaceuticals, Inc.
$81
Insulet Corporation
$80
DEXCOM, INC.
$74
Aytu BioScience, Inc
$70
Verity Pharmaceuticals Inc.
$65
IBSA Pharma Inc.
$63
Acerus Pharmaceuticals Corporation
$58
Currax Pharmaceuticals LLC
$55
Horizon Pharma plc
$50
Alfasigma USA, Inc.
$43
Madrigal Pharmaceuticals
$43
Salix Pharmaceuticals, a division of Bausch Health US, LLC
$42
Gemini Laboratories, LLC
$42
Supernus Pharmaceuticals, Inc.
$42
Boston Scientific Corporation
$40
Merck Sharp & Dohme LLC
$39
Inari Medical, Inc.
$38
Kyowa Kirin, Inc.
$35
ARBOR PHARMACEUTICALS, INC.
$29
Alvogen Inc
$25
Nestle HealthCare Nutrition Inc.
$24
RECORDATI_RARE_DISEASES_INC.
$24
Daiichi Sankyo Inc.
$23
Ascendis Pharma Inc
$22
Tandem Diabetes Care, Inc.
$21
SCILEX PHARMACEUTICALS INC.
$21
EISAI INC.
$20
MannKind Corporation
$18
Ultragenyx Pharmaceutical Inc.
$18
Radius Health, Inc.
$18
Amryt Pharma Holdings Ltd
$17
Shield Therapeutics Inc
$16
Allergan, Inc.
$15
Rhythm Pharmaceuticals, Inc.
$15
Nabriva Therapeutics, plc
$14
Tolmar, Inc.
$14
Nalpropion Pharmaceuticals LLC
$14
Eisai Inc.
$13
Antares Pharma, Inc.
$13
VistaPharm, Inc.
$13
Seqirus USA Inc
$12
Vifor Pharma, Inc.
$12
Arbor Pharmaceuticals, Inc.
$12
Horizon Therapeutics plc
$11
Top 3 companies account for 95.5% of all-time payments
Associated products mentioned in payments ›
ACCRUFER · ACTHAR · AFREZZA · Aimovig · BAQSIMI · BASAGLAR · BD Nano 2nd Gen Pen Needle · BOTOX · CONTRAVE · CeQur Simplicity · Crysvita · DEXCOM G6 TRANSMITTER · DEXCOM G7 GSS (161) · Dayvigo · Dexcom CGM · Dexcom G6 Transmitter · ENTRESTO · EVENITY · Edarbi · FARXIGA · FLOWTRIEVER CATHETER · Fluad · FreeStyle Libre · FreeStyle Libre blood glucose Flash Monitoring System · GVOKE HYPOPEN · GVOKE PFS · HUMALOG · HUMULIN · IMCIVREE · INJECTAFER · INVOKANA · JANUVIA · JARDIANCE · JATENZO · JYNARQUE · KRYSTEXXA · Kerendia · Korlym · LEQVIO · LYUMJEV · LifeVest · MOUNJARO · MYCAPSSA · NASCOBAL · NEXLETOL · NEXLIZET · NURTEC ODT · Natesto · Omnipod · Otezla · Ozempic · PRALUENT · PURIFIED CORTROPHIN GEL · Prolia · QULIPTA · RAYALDEE · RESMETIROM · RYBELSUS · Rayaldee · Repatha · Rybelsus · S · SIGNIFOR LAR · SKYTROFA · SOLIQUA · SOLIQUA 100/33 · STEGLATRO · STRENSIQ · SYNJARDY · SYNTHROID · Sivextro · Strensiq · Synthroid · TAGRISSO · TARPEYO · TERIPARATIDE · TLANDO · TOUJEO · TRULICITY · TZIELD · Thyquidity · Tirosint · Tlando · Tresiba · Tymlos · UBRELVY · UNITHROID · UNITY DIABETES MANAGEMENT SYSTEM · V-GO · V-GO DISPOSABLE INSULIN DELIVERY · VRAYLAR · Vascepa · Veltassa · Victoza · WaveWriter Alpha Prime 16 · Wegovy · XIFAXAN · XYOSTED · ZEGALOGUE · ZENPEP · ZTLido · Zelnorm · t:slim X2 Insulin Pump with Control-IQ
Should you be concerned? Payments from pharmaceutical and device companies are legal and common — 57% of U.S. physicians receive at least one. They often reflect legitimate consulting, research, or education. What matters is whether a recommended drug or device appears in your doctor's payment records. If so, consider asking your doctor about it. How to interpret this data →
The majority of payments (96%) are for speaking programs and promotional activities, which reflect participation in industry-sponsored educational or marketing events. This is common in nephrology and does not inherently indicate bias, but patients may wish to be aware. Total industry engagement is in the top 1% for nephrology in CA.
Geographic Context
Nephrologists within 10 mi
119
Per 100K population
3.8
County median income
$113,702
Nearest hospital
PROVIDENCE MISSION HOSPITAL
2.5 mi
2.5 mi
Data Sources
| Provider Registry | ✓ NPPES | Weekly updates |
| Medicare Enrollment | ✓ PECOS | Monthly updates |
| Practice Data | ✓ Medicare Util. | Annual (CY lag) |
| Industry Payments | ✓ Open Payments | CY 2024 |
| Disciplinary History | — Not public | N/A |
This provider has data in 4 of 4 available federal datasets, with a Data Coverage level of Very High. This reflects how much public data is available about a provider. How we calculate this →
Summary
Dr. Chang is a mixed practice specialist, with above-average Medicare volume (top 1% in CA), with speaking/promotional industry engagement in the top 1% of CA peers, with 19 years of NPI registration.
This summary is auto-generated from federal data, describing data availability and patterns. Read our methodology →
Frequently Asked Questions
Is Dr. Chang experienced with office visit, established patient (30-39 min)?
Based on Medicare claims data, Dr. Chang performed 910 office visit, established patient (30-39 min) services. Research suggests that higher procedure volume is often associated with better outcomes, particularly for complex procedures. Note that Medicare data only captures patients aged 65 and older, so the total practice volume across all patients is likely higher.
Does Dr. Chang receive payments from pharmaceutical companies?
Yes. Dr. Chang received a total of $369,942 from 81 companies across 1,227 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common among physicians — 57% of all U.S. physicians receive at least one industry payment. Patients may wish to ask their doctor about these relationships, especially if a recommended drug or device appears in the payment records.
How do Dr. Chang's costs compare to other nephrologists in Lake Forest?
Dr. Chang's average Medicare payment per service is $19. Note that these figures represent what Medicare pays, not your out-of-pocket cost, which depends on your specific insurance plan and deductible. Procedure-level data above shows both what was submitted and what Medicare paid for each service type.
What does Data Coverage mean?
Data Coverage (currently Very High for Dr. Chang) measures how much public federal data is available about a provider. It is not a quality rating. A "Very High" or "High" level means the provider has data across multiple federal sources (NPPES, PECOS, Medicare Utilization, Open Payments), indicating a long track record of practice, Medicare participation, and industry disclosure. A "Low" or "Moderate" level may simply mean the provider is newer, does not see Medicare patients, or has not received any industry payments — none of which are inherently negative. Read our full methodology →
Is this data up to date?
Each data source has its own update cycle. Provider registry data (NPPES) is updated weekly. Medicare enrollment (PECOS) is updated monthly. Medicare practice data has a ~2 year lag — the most recent available is typically 2 years prior. Industry payment data (Open Payments) is published annually, usually in June, covering the prior calendar year. We display the data date prominently on each section so you always know how current it is. See our data freshness policy →
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About this page
All data on this page is sourced verbatim from public federal records published by the U.S. Centers for Medicare & Medicaid Services (CMS): NPPES ↗, Open Payments ↗, Medicare Provider Utilization ↗, and PECOS. Publication is mandated by the Physician Payments Sunshine Act (§6002 ACA, 42 U.S.C. §1320a-7h) and the Freedom of Information Act.
This page is not medical advice, an endorsement, a recommendation, or a quality rating. Data Coverage reflects data completeness — how much federal information exists for this provider — not clinical performance, patient outcomes, or quality of care. Always verify information directly with the provider and consult a licensed clinician before making medical decisions.
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