TARA I-HSIN CHANG (MD) – Nephrology Physician, NPI 1437166592
Nephrology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
1,404 NEPHROLOGY in CA
Provider Addresses for TARA I-HSIN CHANG (MD)
300 Pasteur Drive A160
Stanford Medical Specialties - Kidney Clinic
Palo Alto, CA 943041613
Phone: (650) 723-6961
Type: Location
300 PASTEUR DR
STANFORD, CA 943052200
Phone: (650) 725-4000
Type: Mailing
777, Welch Road, Palo Alto, Santa Clara County, California, 94305, United States
SUITE DE ROOM D100
PALO ALTO, CA 943041613
Phone: (650) 725-4738
Fax: (650) 721-1443
Type: Mailing
Pasteur Drive, Palo Alto, Santa Clara County, California, 94305, United States
STANFORD MEDICAL SPECIALTIES - KIDNEY CLINIC
PALO ALTO, CA 943041613
Phone: (650) 723-6961
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 56 Open Payments records for all available years, with a total value of $39,038.
Total Amount is formed as General ($8,413) + Research ($30,625) + Ownership ($0) = $39,038.
Last reported payment date: 2024-10-24 • Largest payer in this snapshot: Novo Nordisk AS ($30,625).
Total Amount
$39,038
General + Research + Ownership
Payments
56
Total payment records
General Amount
$8,413
General payments
Research Amount
$30,625
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-10-24
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Novo Nordisk AS | $30,625 |
| AstraZeneca UK Limited | $6,595 |
| Alexion Pharmaceuticals, Inc. | $1,819 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2006-08-23
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20060823000224 | I | Nephrology | CA | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99232 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 112 | 67 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 95 | 77 | $0 |
| 99231 | Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes | 83 | 55 | $0 |
| 90945 | Dialysis procedure including 1 evaluation | 50 | 16 | $0 |
| 99222 | Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 39 | 39 | $0 |
Insurance plans in this area (ZIP 94304)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| NEPHROLOGY | CA | 90935 | Hemodialysis procedure with one physician evaluation | 33 | 21 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| O B S T E T R I C S/ G Y N E C O L O G Y | TX | |
| - | CA | |
| - | CA | |
| - | CA | |
| O B S T E T R I C S/ G Y N E C O L O G Y | CA | |
| Hematology, Medical Oncology | NY | |
| Certified Registered Nurse Anesthetist (Crna) | TX | |
| Nurse Practitioner | CA | |
| Nurse Practitioner | CA | |
| Neuropsychiatry, Neurology | CA |
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