Chang Joo, MD
NPI 1508868787 · Nephrology Physician · Modesto, CA
Enrolled with Medicare as Practitioner - Nephrology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Chang Joo, MD is a Nephrology Physician provider in Modesto, CA (NPI 1508868787).
Provider details
- NPI number
- 1508868787
- Entity type
- Individual
- Primary specialty
- Nephrology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A481920 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
21 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
1,306 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 374 | $129 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 238 | $76 |
| Dialysis Services, 4 Or More Physician Visits Per Month (20 Years Or Older)90960 | 190 | $349 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 163 | $116 |
| Dialysis Services, 2-3 Physician Visits Per Month (20 Years Or Older)90961 | 117 | $291 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 32 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Calcitriol | 331 | 102 |
| Amlodipine Besylate | 252 | 85 |
| Parenteral Amino Acid 20% No.1brand: Prosol | 127 | — |
| Losartan Potassium | 126 | 47 |
| Furosemide | 97 | 36 |
| Hydralazine Hcl | 83 | 27 |
| Sevelamer Carbonate | 71 | 29 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$45 across 2 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-06-01
- Last updated
- 2008-02-22
Frequently asked questions
- What is Chang Joo's NPI number?
- Chang Joo's National Provider Identifier (NPI) is 1508868787, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Chang Joo's specialty?
- Chang Joo is listed in the NPPES registry with a primary specialty of Nephrology Physician (Allopathic & Osteopathic Physicians).
- Where is Chang Joo located?
- Chang Joo's practice location on file with NPPES is 305 E Granger Ave, Modesto, CA 95350-4344.
- What is Chang Joo's phone number?
- The practice phone number listed in the NPPES registry for Chang Joo is (209) 526-1606.
- Does Chang Joo accept Medicare?
- Chang Joo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Chang Joo's NPI active?
- Yes — Chang Joo's NPI (1508868787) is active in the NPPES registry as of the last update on 2008-02-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.