Quick answers
- Which hospitals does Avinash K. Viswanathan work at?
- Medicare's official clinician data lists Avinash K. Viswanathan at 5 hospitals: Jacksonville Memorial Hospital, Memorial Medical Center, Sarah D Culbertson Memorial Hospital, St Johns Hospital and Taylorville Memorial Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Avinash K. Viswanathan see patients?
- Medicare's clinician data lists 1 practice location in Springfield, IL. Call before your visit to confirm the address.
- What is Avinash K. Viswanathan's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Avinash K. Viswanathan accept Medicare assignment?
- Yes. Medicare's clinician data says Avinash K. Viswanathan accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Avinash K. Viswanathan?
- (217) 862-0800, as listed in official Medicare / NPI Registry data.
- What is Avinash K. Viswanathan's NPI number?
- 1639487911. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Avinash K. Viswanathan works
Medicare's Facility Affiliation Data lists Avinash K. Viswanathan at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Jacksonville Memorial HospitalJacksonville, IL · Critical Access Hospital · CCN 141352
- Memorial Medical CenterSpringfield, IL · Acute Care Hospital · CCN 140148
- Sarah D Culbertson Memorial HospitalRushville, IL · Critical Access Hospital · CCN 141333
- St Johns HospitalSpringfield, IL · Acute Care Hospital · CCN 140053
- Taylorville Memorial HospitalTaylorville, IL · Critical Access Hospital · CCN 141339
Practice locations
Addresses where Avinash K. Viswanathan is enrolled with Medicare (CMS data updated 2026-10-02).
- 3132 Old Jacksonville Rd, Suite 200Springfield, IL 62704 (217) 862‑0800
Group practices
Medicare enrollment lists Avinash K. Viswanathan as a member of this group (CMS data updated 2026-10-02).
- Memorial Physician Services165 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Springfield
Clinicians with the same Medicare primary specialty in Springfield, IL — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2010 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1639487911 |
| 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 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- 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