Quick answers
- Does Amitabha Mazumder accept Medicare assignment?
- Yes. Medicare's clinician data says Amitabha Mazumder 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 Amitabha Mazumder see?
- In 2024, CMS data shows 114 Original Medicare patients and 16,220 services for Amitabha Mazumder. This counts Original Medicare only and measures volume, not quality.
- What is Amitabha Mazumder's NPI number?
- 1881682318. 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 Amitabha Mazumder, 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 | 114 |
|---|---|
| Services billed to Medicare | 16,220 |
| Different services or procedures | 47 |
| Participating Medicare provider | Yes |
| Average age of these patients | 70 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)150 services
- Enhancing oncology model (eom) monthly enhanced oncology services (meos) payment for eom enhanced services (M0010)117 services
- Telephone medical discussion with physician, 21-30 minutes (99443)63 services
- Infusion into a vein for therapy, prevention, or diagnosis, additional sequential infusion, 1 hour or less (96367)23 services
- New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)11 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 cholesterol72%
- Arthritis58%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)48%
- Diabetes36%
- Depression27%
Practice locations
Addresses where Amitabha Mazumder is enrolled with Medicare (CMS data updated October 2, 2026).
- 50 Bellefontaine StPasadena, CA 91105 (626) 486‑9447
Group practices
Medicare enrollment lists Amitabha Mazumder as a member of this group (CMS data updated October 2, 2026).
- The Oncology Institute Ca, a Professional Corporation113 clinicians in the group
Specialties
- Medical Oncologyprimary
Other oncologists in Pasadena
Clinicians with the same Medicare primary specialty in Pasadena, CA — not a recommendation.
Other clinicians in The Oncology Institute Ca, a Professional Corporation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Johns Hopkins University School Of Medicine |
| Graduation year | 1977 (49 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1881682318 |
| 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
- 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