Quick answers
- Does Karleung S. Siu accept Medicare assignment?
- Yes. Medicare's clinician data says Karleung S. Siu accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Karleung S. Siu see?
- In 2024, CMS data shows 393 Original Medicare patients and 15,215 services for Karleung S. Siu. This counts Original Medicare only and measures volume, not quality.
- What is Karleung S. Siu's NPI number?
- 1649417437. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Karleung S. Siu, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 393 |
|---|---|
| Services billed to Medicare | 15,215 |
| Different services or procedures | 146 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)600 services
- Insertion of needle into vein for collection of blood sample (36415)510 services
- Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count (85025)486 services
- Blood test, comprehensive group of blood chemicals (80053)276 services
- Lactate dehydrogenase (enzyme) level (83615)261 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)50%
- Arthritis47%
- Ischemic heart disease35%
- Anxiety30%
Hospitals where Karleung S. Siu works
Medicare's Facility Affiliation Data lists Karleung S. Siu at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Clara Maass Medical CenterBelleville, NJ · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 310009
- Cooperman Barnabas Medical CenterLivingston, NJ · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 310076
- Morristown Medical CenterMorristown, NJ · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 310015
Practice locations
Addresses where Karleung S. Siu is enrolled with Medicare (CMS data updated October 2, 2026).
- 94 Old Short Hills RdLivingston, NJ 07039 (973) 322‑2916
Group practices
Medicare enrollment lists Karleung S. Siu as a member of this group (CMS data updated October 2, 2026).
- Barnabas Health Medical Group PC1,070 clinicians in the group
Specialties
- Hematology/Oncologyprimary
- Hospice/Palliative Carealso
- Internal Medicinealso
Other hematologist-oncologists in Livingston
Clinicians with the same Medicare primary specialty in Livingston, NJ — not a recommendation.
Other clinicians in Barnabas Health Medical Group PC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | State University Of New York Downstate Medical Center |
| Graduation year | 2005 (21 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1649417437 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians