Tejaswini R. Nayak, M.D.
NPI 1609841303ActiveIndividual· Internal Medicine· Saint Charles, MO
Internal Medicine (M.D.) with Mercy Clinic East Communities, practicing in Saint Charles, Missouri. Their prescriptions cost Medicare Part D more than their services did: $558,880 for 7,777 claims, against $52,857 paid for services in 2024. Novo Nordisk Inc was the largest of 12 companies reporting payments in 2025, $333.87 in all, mostly food and beverage. Lists Mercy Hospital South and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1609841303 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Feb 17, 2006 |
| Last updated in NPPES | Sep 5, 2012 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 2002015974 | MO |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Internal Medicine (MO) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 124 |
|---|---|
| Services billed | 677 across 27 procedure codes |
| Paid by Medicare | $52,857 |
Part D prescriptions in 2024
| Prescriptions (claims) | 7,777 · 18,301 30-day fills |
|---|---|
| Patients | 431 |
| Total drug cost | $558,880 |
| Generic share | 88% of claims |
Education and affiliations
| Graduation year | 1997 |
|---|---|
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Mercy Clinic East CommunitiesSaint Louis, MO · 571 clinicians
Hospital affiliations
- Mercy Hospital SouthSaint Louis, MO
- Mercy Hospital St LouisSaint Louis, MO
- St Lukes HospitalChesterfield, MO
Industry payments (Open Payments)
- 2025$333.87 · 18 payments from 12 companies
- 2024$120.37 · 6 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Novo Nordisk Inc | $71.75 | 4 |
| Lilly USA, LLC | $65.25 | 3 |
| Pfizer Inc. | $35.06 | 2 |
| Hologic Sales and Service, LLC | $23.38 | 1 |
| E.R. Squibb & Sons, L.L.C. | $21.85 | 1 |
What the 2025 payments were for
- Food and Beverage$333.87 · 18 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other internal medicine physicians in Saint Charles
- 1184042855
- 1275594046
- 1356349609
- 1447508874
- 1588818777
- 1609079409
- 1609338656
- 1629384136
- 1689771875
- 1780645960
- 1841251048
- 1851738769
All 38 internal medicine physicians in Saint Charles · All internal medicine physicians in Missouri