Quick answers
- Which hospitals does Karthik V. Iyer work at?
- Medicare's official clinician data lists Karthik V. Iyer at 1 hospital: Mercy Hospital Jefferson. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Karthik V. Iyer see patients?
- Medicare's clinician data lists 1 practice location in Festus, MO. Call before your visit to confirm the address.
- What is Karthik V. Iyer's specialty?
- Medicare lists Internal Medicine as the primary specialty, and also Critical Care (Intensivists).
- Does Karthik V. Iyer accept Medicare assignment?
- Yes. Medicare's clinician data says Karthik V. Iyer 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 Karthik V. Iyer?
- (636) 933-5337, as listed in official Medicare / NPI Registry data.
- What is Karthik V. Iyer's NPI number?
- 1013203454. 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 V. Iyer works
Medicare's Facility Affiliation Data lists Karthik V. Iyer at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Mercy Hospital JeffersonCrystal City, MO · Acute Care Hospital · CCN 260023
Practice locations
Addresses where Karthik V. Iyer is enrolled with Medicare (CMS data updated 2026-10-02).
- 1400 US Hwy 61, Suite 250Festus, MO 63028 (636) 933‑5337
Group practices
Medicare enrollment lists Karthik V. Iyer as a member of this group (CMS data updated 2026-10-02).
- Mercy Clinic Adult Critical Care LLC60 clinicians in the group
Specialties
Other internal medicine doctors in Festus
Clinicians with the same Medicare primary specialty in Festus, MO — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2004 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1013203454 |
| 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