John Sy, M.D.
NPI 1639435738 · Nephrology Physician · Long Beach, CA
Enrolled with Medicare as Practitioner - Nephrology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Sy, M.D. is a Nephrology Physician provider in Long Beach, CA (NPI 1639435738).
Provider details
- NPI number
- 1639435738
- Entity type
- Individual
- Primary specialty
- Nephrology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A128347 (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
14 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
1,323 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 312 | $130 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 305 | $87 |
| Dialysis Services, 4 Or More Physician Visits Per Month (20 Years Or Older)90960 | 194 | $393 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 180 | $107 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 127 | $144 |
| Telephone Medical Discussion With Physician, 11-20 Minutes99442 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 26 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Losartan Potassium | 79 | 25 |
| Sucroferric Oxyhydroxidebrand: Velphoro | 52 | — |
| Sodium Zirconium Cyclosilicatebrand: Lokelma | 52 | 14 |
| Amlodipine Besylate | 47 | 16 |
| Furosemide | 38 | 18 |
| Carvedilol | 38 | 12 |
| Semaglutidebrand: Ozempic | 32 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$306 across 11 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
- 2012-04-03
- Last updated
- 2018-06-21
Frequently asked questions
- What is John Sy's NPI number?
- John Sy's National Provider Identifier (NPI) is 1639435738, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Sy's specialty?
- John Sy is listed in the NPPES registry with a primary specialty of Nephrology Physician (Allopathic & Osteopathic Physicians).
- Where is John Sy located?
- John Sy's practice location on file with NPPES is 5901 E 7th St, Long Beach, CA 90822.
- What is John Sy's phone number?
- The practice phone number listed in the NPPES registry for John Sy is (562) 826-8000.
- Does John Sy accept Medicare?
- John Sy is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Sy's NPI active?
- Yes — John Sy's NPI (1639435738) is active in the NPPES registry as of the last update on 2018-06-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.