Dr. Chang S. Joo, MD
- Medicare services, 2024
- 1,306
- Medicare patients, 2024
- 436
- Part D claims, 2024
- 1,889
- MIPS score, 2024
- 100
- Hospital affiliations
- 4
- Practice address
- 305 East Granger, Modesto, CA 95350
- Practice phone
- Call (209) 574-6800
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
U.S. Renal Care Modesto Dialysis
Dialysis Center - Independent · Modesto, California
Find Dr. Joo's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Chang S. Joo is a nephrologist in Modesto, California
Dr. Joo practices at U.S. Renal Care Modesto Dialysis in Modesto, California.
Dr. Joo's NPI, 1508868787, was assigned on June 1, 2005. Dr. Joo graduated from Yonsei University College of Medicine in 1980. Dr. Joo's California license number on file is A481920.
- NPI
- 1508868787NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6507832201
- NPI enumeration date
- June 1, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (209) 574-6800
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 72
- Medical school graduation
- 1980
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Chang S. Joo practices at U.S. Renal Care Modesto Dialysis in Modesto, California
Dr. Joo's primary practice is U.S. Renal Care Modesto Dialysis, at 305 East Granger, Modesto, CA 95350 in Stanislaus County. The practice phone is (209) 574-6800.
- U.S. Renal Care Modesto Dialysis305 East Granger, Modesto, CA 95350 · Stanislaus CountyPhone(209) 574-6800
Source: Dmand AI Affiliation Data
Dr. Chang S. Joo is affiliated with 9 sites of care and 1 medical group
Dr. Joo's primary practice is U.S. Renal Care Modesto Dialysis in Modesto, California. Dr. Joo is also affiliated with Memorial Medical Center. The medical group on file is Modesto Kidney Medical Group. Dmand AI also links Dr. Joo to 3 more hospitals and 4 dialysis centers, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Chang S. Joo's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Joo practices, 9 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| U.S. Renal Care Modesto Dialysis | Available with a free account |
| +8 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Chang S. Joo is one of 1,401 nephrologists in California
Nephrology is Dr. Joo's primary specialty in the NPI Registry, under taxonomy code 207RN0300X. Dr. Joo is board certified in nephrology by the American Board of Internal Medicine. Dmand AI has Dr. Joo's licenses on file in 3 states: California, Colorado and New York.
Specialties and state licenses
- Nephrology, CaliforniaPrimary
- Colorado license
- New York license
Clinical focus
Dmand AI lists acute kidney failure, chronic kidney disease, fluid and electrolyte imbalances and kidney cysts among the conditions Dr. Joo treats.
Nephrologists near Dr. Joo
Counts of nephrologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Chang S. Joo billed Medicare for 1,306 services in 2024
CMS data shows 1,306 Medicare services from Dr. Joo across 11 procedure codes in 2024, for 436 Medicare patients. Medicare paid $168,082 for them.
Dr. Joo's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 9602024: 9224%
- Tests and treatments
- 2023: 3752024: 3682%
- Lab and pathology
- 2023: 212024: 1624%
Where Dr. Joo's Medicare services took place, 2024
- In an office80962%
- In a facility49738%
Dr. Joo compared with the California median for nephrologists, 2024
- Dr. Joo
- California median
- Medicare services
- 1,306vs 1,08420% above
- Medicare patients
- 436vs 30742% above
- Part D claims
- 1,684vs 95576% above
Medians across 1,355 nephrologists in California with Dmand AI profiles that report each measure.
Dr. Joo's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Joo and other nephrologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Chang S. Joo treated 436 Medicare patients in 2024, average age 73
CMS counts 436 Medicare patients who saw Dr. Joo in 2024. The largest group is 75 to 84, with 167 patients. 75% of them have chronic kidney disease, and 75% have high blood pressure. 48% are also on Medicaid. Their average risk score is 3.15, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Joo's median patient age at 76, with 54% women.
Dr. Joo's Medicare patients by age, 2024
Dr. Joo's Medicare patients by sex, 2024
- Women21650%
- Men22050%
Chronic conditions among Dr. Joo's Medicare patients, 2024
- Chronic kidney disease75%
- High blood pressure75%
- High cholesterol75%
- Diabetes64%
- Arthritis50%
- Ischemic heart disease43%
- Heart failure42%
- Atrial fibrillation30%
Share of Medicare patients with each condition. A patient can have several.
Dr. Joo's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 76
Patient panel by sex, all payers
- Women54%
- Men45%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Chang S. Joo wrote 1,889 Medicare Part D claims in 2024
In 2024, Dr. Joo wrote 1,889 Medicare Part D claims for 364 patients. 83% of them were for generic drugs. CMS names the drug for 1,684 of them, across 32 drugs with 11 or more claims each, at $190,386 in total drug cost. In 2023, CMS named 1,548 claims across 31 drugs.
Dr. Joo's Part D claims by kind of drug, 2024
- Generic1,576 claims83%
- Brand-name313 claims17%
Dr. Joo's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Joo's Part D claims, 2024
- Antibiotics2%37 of 1,889 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1,5482024: 1,6849%
Drugs named by CMS: 32 in 2024, 31 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Chang S. Joo scored 100 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 100 out of 100 for Dr. Joo for performance year 2024, reported individually. Dr. Joo accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Joo's MIPS scores, performance year 2024
- 100of 100Final score
- 100of 100Quality
- 40of 100Improvement Activities
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Chang S. Joo received $2,950 in industry payments from 2016 to 2025
CMS Open Payments shows 184 general payments to Dr. Joo from 23 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 94% of the total. Relypsa, Inc. paid the most, $724.
General payments to Dr. Joo by program year, 2016 to 2025
General payments to Dr. Joo by kind, 2016 to 2025
- Food and beverage$2,76694%
- Education$1856%
Companies that paid Dr. Joo the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Chang S. Joo has 1 award and honors on record
Dmand AI lists 1 award for Dr. Joo, most recently CMS Stage 1 EHR in 2013.
Awards and honors for Dr. Joo
- 2013
- CMS Stage 1 EHR
Source: Dmand AI Professional Profile Data
Dr. Chang S. Joo graduated from Yonsei University College of Medicine
Dr. Joo graduated from Yonsei University College of Medicine in 1980.
- Medical school
- Board certified in nephrology
Source: Dmand AI Professional Profile Data
Dr. Chang S. Joo accepts plans from 16 insurance carriers
Dr. Joo is in network with 16 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. PPO plans come from the most carriers, 9. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Michigan
- United Healthcare
- Elevance
- HCSC
- Blue Cross Blue Shield of Massachusetts
- Regence Health Plans
- Alliant Health Plans
- +8 more carriersWith a free account
Plan types Dr. Joo accepts, by number of carriers
- PPO9
- Medicare8
- HMO7
- EPO4
- POS4
Source: Dmand AI Insurance Network Data
Sources for Dr. Chang S. Joo's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Chang S. Joo
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Chang S. Joo's NPI number?
Dr. Chang S. Joo's NPI number is 1508868787. It was assigned on June 1, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Chang S. Joo?
Dr. Chang S. Joo is a nephrologist in Modesto, California. The primary specialty in the NPI Registry is Nephrology Physician (taxonomy code 207RN0300X).
Where does Dr. Chang S. Joo practice?
Dr. Joo practices at 305 East Granger, Modesto, CA 95350. Dr. Joo's primary practice is U.S. Renal Care Modesto Dialysis in Modesto, California. Dmand AI also links Dr. Joo to 3 hospitals and 4 dialysis centers.
What is Dr. Chang S. Joo's office phone number?
The practice phone on file for Dr. Joo is (209) 574-6800.
What is Dr. Chang S. Joo's medical license number?
Dr. Joo's California license number on file is A481920, one of the licenses on file in 3 states.
Which states has Dr. Chang S. Joo been licensed in?
Dmand AI has state licenses on file for Dr. Joo in California (1990 to 2025), Colorado (1993 to 1999) and New York (1991 to 1997).
Which hospitals is Dr. Chang S. Joo affiliated with?
Dr. Joo is affiliated with Memorial Medical Center. Dmand AI links Dr. Joo to 3 more hospitals.
What medical group is Dr. Chang S. Joo part of?
Dr. Joo is linked to Modesto Kidney Medical Group.
Does Dr. Chang S. Joo accept Medicare?
Yes. CMS data shows Dr. Joo billed Medicare for 1,306 services in 2024, and Dr. Joo accepts Medicare assignment.
What is Dr. Chang S. Joo's MIPS score?
Dr. Joo's MIPS final score for performance year 2024 is 100 out of 100, reported individually.
Show 8 more questionsShow fewer questions
How many Medicare patients does Dr. Chang S. Joo see?
CMS counts 436 Medicare patients who saw Dr. Joo in 2024, with an average age of 73.
Is Dr. Chang S. Joo board certified?
Yes. Dr. Joo is board certified in nephrology by the American Board of Internal Medicine.
What services does Dr. Chang S. Joo bill to Medicare?
In 2024, Dr. Joo's most billed Medicare services were office visit, established patient (99214), hospital inpatient care (99232) and dialysis (90960).
Where did Dr. Chang S. Joo go to medical school?
Dr. Joo graduated from Yonsei University College of Medicine in 1980.
What drugs does Dr. Chang S. Joo prescribe most?
In 2024 Medicare Part D data, Dr. Joo's most prescribed drugs by claims were Calcitriol, Amlodipine Besylate and Prosol.
Has Dr. Chang S. Joo received payments from drug or device companies?
CMS Open Payments shows $2,950 in general payments to Dr. Joo from 23 companies from 2016 to 2025. The largest total came from Relypsa, Inc.
How long has Dr. Chang S. Joo been practicing?
Dr. Joo graduated from medical school in 1980, 46 years ago.
What insurance does Dr. Chang S. Joo accept?
Dr. Joo is in network with 16 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. PPO plans come from the most carriers, 9. Check the plan with the practice before a visit.
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