Alexander George Chamessian, MD PHD
NPI 1275194839ActiveIndividual· Physical Medicine & Rehabilitation· Creve Coeur, MO
Physical Medicine & Rehabilitation (MD PHD) with Washington University and 1 other group, practicing in Creve Coeur, Missouri. Their prescriptions cost Medicare Part D more than their services did: $13,705 for 568 claims, against $3,663 paid for services in 2024. Promega Corporation was the largest of 7 companies reporting payments in 2025, $34,348 in all, mostly food and beverage. Lists Barnes Jewish Hospital and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1275194839 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD PHD |
| Sole proprietor | No |
| NPI issued | Jun 25, 2019 |
| Last updated in NPPES | Nov 21, 2025 |
| Certified by provider | Nov 21, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Physical Medicine & Rehabilitation Primary | 208100000X | 2023022542 | MO |
| Physical Medicine & Rehabilitation, Pain Medicine | 2081P2900X | 2023022542 | MO |
| Anesthesiology, Pain Medicine | 207LP2900X | 2023022542 | 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 - Anesthesiology (MO) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 17 |
|---|---|
| Services billed | 48 across 13 procedure codes |
| Paid by Medicare | $3,663 |
Part D prescriptions in 2024
| Prescriptions (claims) | 568 · 822 30-day fills |
|---|---|
| Patients | 206 |
| Total drug cost | $13,705 |
| Generic share | 99% of claims |
Education and affiliations
| Graduation year | 2019 |
|---|---|
| Medicare specialty | Anesthesiology |
| Secondary specialties | Physical Medicine And Rehabilitation |
Medical groups
- Washington UniversitySaint Louis, MO · 3,029 clinicians
- Post-Acute Physicians of Missouri, PCLake Saint Louis, MO · 12 clinicians
Hospital affiliations
- Barnes Jewish HospitalSaint Louis, MO
- Barnes-Jewish West County HospitalCreve Coeur, MO
- Memorial HospitalBelleville, IL
- Missouri Baptist Medical CenterSaint Louis, MO
- Ssm St Joseph Hospital WestLake Saint Louis, MO
Industry payments (Open Payments)
- 2025$34,348 · 41 payments from 7 companies
- 2024$12,028 · 26 payments from 5 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Promega Corporation | $11,565 | 2 |
| Pacira Pharmaceuticals Incorporated | $10,483 | 14 |
| Spr Therapeutics, Inc | $8,603 | 2 |
| Boston Scientific Corporation | $2,442 | 11 |
| Medtronic, Inc. | $1,133 | 10 |
What the 2025 payments were for
- Food and Beverage$12,241 · 20 payments
- Consulting Fee$9,500 · 1 payment
- Charitable Contribution$8,500 · 1 payment
- Travel and Lodging$4,107 · 19 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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