Quick answers
- Does Karthik S. Sivashanker accept Medicare assignment?
- Yes. Medicare's clinician data says Karthik S. Sivashanker 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.
- What is Karthik S. Sivashanker's NPI number?
- 1912140054. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Karthik S. Sivashanker works
Medicare's Facility Affiliation Data lists Karthik S. Sivashanker 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.
- UMass Memorial Healthalliance HospitalsLeominster, MA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 220001
Practice locations
Addresses where Karthik S. Sivashanker is enrolled with Medicare (CMS data updated October 2, 2026).
- 103 Garland StEverett, MA 02149 (617) 389‑6270
- 1493 Cambridge StCambridge, MA 02139 (617) 665‑1000
- 380 Massachusetts AveActon, MA 01720 (978) 264‑3619
- 45 Dimock StRoxbury, MA 02119 (617) 442‑8800
- 85 Patton RdDevens, MA 01434 (978) 615‑5200
Group practices
Medicare enrollment lists Karthik S. Sivashanker as a member of these groups (CMS data updated October 2, 2026).
- Cambridge Public Health Commission656 clinicians in the group
- Dimock Community Health Center, Inc.42 clinicians in the group
- Devens Treatment and Recovery Center LLC30 clinicians in the group
- Justice Resource Institute, Inc26 clinicians in the group
Specialties
- Psychiatryprimary
Other psychiatrists in Everett
Clinicians with the same Medicare primary specialty in Everett, MA — not a recommendation.
Other clinicians in Cambridge Public Health Commission
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2009 (17 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1912140054 |
| 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
- 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