Riaz Ahmed Sirajuddin, M.D.
NPI 1235186099ActiveIndividual· Internal Medicine, Cardiovascular Disease· Oklahoma City, OK
Internal Medicine, Cardiovascular Disease (M.D.) in Oklahoma City, Oklahoma, trained at Indiana University School of Medicine (class of 1991). Their prescriptions cost Medicare Part D more than their services did: $1,039,649 for 4,005 claims, against $144,893 paid for services in 2024. Novo Nordisk Inc was the largest of 19 companies reporting payments in 2025, $35,836 in all, mostly speaking and faculty fees.
Overview
| NPI | 1235186099 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | May 27, 2006 |
| Last updated in NPPES | Feb 24, 2026 |
| Certified by provider | Feb 24, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Cardiovascular Disease Primary | 207RC0000X | 22726 | OK |
| Internal Medicine, Cardiovascular Disease | 207RC0000X | 35.071247 | OH |
| Specialist | 174400000X | 22726 | OK |
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 - Cardiovascular Disease (Cardiology) (OH); Practitioner - Cardiovascular Disease (Cardiology) (OK); Practitioner - Cardiovascular Disease (Cardiology) (VT) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 342 |
|---|---|
| Services billed | 1,885 across 47 procedure codes |
| Paid by Medicare | $144,893 |
Part D prescriptions in 2024
| Prescriptions (claims) | 4,005 · 6,954 30-day fills |
|---|---|
| Patients | 470 |
| Total drug cost | $1,039,649 |
| Generic share | 67% of claims |
Education and affiliations
| Medical school | Indiana University School of Medicine |
|---|---|
| Graduation year | 1991 |
| Medicare specialty | Cardiovascular Disease (Cardiology) |
Medical groups
- Adena Medical Group LLCChillicothe, OH · 386 clinicians
- Riaz A. Sirajuddin MD PCOklahoma City, OK · 3 clinicians
Hospital affiliations
- Adena Pike Medical CenterWaverly, OH
- Adena Regional Medical CenterChillicothe, OH
- Carnegie Tri-County Municipal HospitalCarnegie, OK
- Ssm Health St Anthony Hospital - Oklahoma CityOklahoma City, OK
- The Physicians' Hospital in AnadarkoAnadarko, OK
Industry payments (Open Payments)
- 2025$35,836 · 116 payments from 19 companies
- 2024$37,934 · 126 payments from 23 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Novo Nordisk Inc | $34,001 | 26 |
| Medtronic, Inc. | $357.02 | 11 |
| Pfizer Inc. | $287.78 | 17 |
| Astrazeneca Pharmaceuticals LP | $254.90 | 15 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $147.30 | 9 |
What the 2025 payments were for
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$28,859 · 5 payments
- Travel and Lodging$4,253 · 7 payments
- Food and Beverage$2,724 · 104 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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