Quick answers
- Does Kartik K. Viswanathan accept Medicare assignment?
- Yes. Medicare's clinician data says Kartik K. Viswanathan 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 Kartik K. Viswanathan see?
- In 2024, CMS data shows 283 Original Medicare patients and 803 services for Kartik K. Viswanathan. This counts Original Medicare only and measures volume, not quality.
- What is Kartik K. Viswanathan's NPI number?
- 1629150974. 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 Kartik K. Viswanathan, 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 | 283 |
|---|---|
| Services billed to Medicare | 803 |
| Different services or procedures | 26 |
| Participating Medicare provider | Yes |
| Average age of these patients | 72 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)306 services
- Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's (G2211)178 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)151 services
- Hemoglobin a1c level (83036)58 services
- Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)15 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 pressure71%
- High cholesterol58%
- Arthritis41%
- Anxiety32%
- Diabetes25%
- Depression23%
Hospitals where Kartik K. Viswanathan works
Medicare's Facility Affiliation Data lists Kartik K. Viswanathan 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.
- Baystate Medical CenterSpringfield, MA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 220077
- Holyoke Medical CenterHolyoke, MA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 220024
- The Cooley Dickinson Hospital IncNorthampton, MA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 220015
Practice locations
Addresses where Kartik K. Viswanathan is enrolled with Medicare (CMS data updated October 2, 2026).
- 10 Hospital DrHolyoke, MA 01040 (413) 535‑4714
- 2 Hospital Dr, Suite 101Holyoke, MA 01040 (413) 536‑8924
Group practices
Medicare enrollment lists Kartik K. Viswanathan as a member of this group (CMS data updated October 2, 2026).
- Western Mass Physician Associates Inc71 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Holyoke
Clinicians with the same Medicare primary specialty in Holyoke, MA — not a recommendation.
Other clinicians in Western Mass Physician Associates Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1991 (35 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1629150974 |
| 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