Quick answers
- Does Mahalingam Sivakumar accept Medicare assignment?
- Medicare's clinician data says Mahalingam Sivakumar may accept Medicare assignment (as of October 2, 2026). Ask the office whether they accept it for your visit.
- How many Medicare patients does Mahalingam Sivakumar see?
- In 2024, CMS data shows 362 Original Medicare patients and 775 services for Mahalingam Sivakumar. This counts Original Medicare only and measures volume, not quality.
- What is Mahalingam Sivakumar's NPI number?
- 1013901172. 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 Mahalingam Sivakumar, 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 | 362 |
|---|---|
| Services billed to Medicare | 775 |
| Different services or procedures | 54 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Ultrasound study of arm or leg veins with compression and maneuvers (93970)300 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)145 services
- Complete ultrasound study of arm and leg arteries (93923)49 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)29 services
- Ultrasound of both sides of head and neck blood flow (93880)17 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%
- Diabetes68%
- Arthritis53%
- Chronic kidney disease53%
- Ischemic heart disease48%
Hospitals where Mahalingam Sivakumar works
Medicare's Facility Affiliation Data lists Mahalingam Sivakumar 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.
- Brooklyn Hospital Center - Downtown CampusBrooklyn, NY · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 330056
Practice locations
Addresses where Mahalingam Sivakumar is enrolled with Medicare (CMS data updated October 2, 2026).
- 240 Willoughby St, Suite 6dBrooklyn, NY 11201
Specialties
- Vascular Surgeryprimary
Other vascular surgeons in Brooklyn
Clinicians with the same Medicare primary specialty in Brooklyn, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1983 (43 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1013901172 |
| 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