Merle L. Diamond, MD
NPI 1780676668ActiveIndividual· Internal Medicine· Chicago, IL
Internal Medicine (MD) in Chicago, Illinois, trained at Northwestern University Feinberg Medical School (class of 1980). Their prescriptions cost Medicare Part D more than their services did: $1,320,598 for 5,580 claims, against $347,997 paid for services in 2024. Abbvie Inc. was the largest of 13 companies reporting payments in 2025, $50,699 in all, mostly consulting fees.
Overview
| NPI | 1780676668 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Aug 17, 2005 |
| Last updated in NPPES | Oct 31, 2025 |
| Certified by provider | Oct 31, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 036063282 | IL |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Internal Medicine (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 438 |
|---|---|
| Services billed | 30,660 across 37 procedure codes |
| Paid by Medicare | $347,997 |
Part D prescriptions in 2024
| Prescriptions (claims) | 5,580 · 8,160 30-day fills |
|---|---|
| Patients | 362 |
| Total drug cost | $1,320,598 |
| Generic share | 83% of claims |
Education and affiliations
| Medical school | Northwestern University Feinberg Medical School |
|---|---|
| Graduation year | 1980 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Endeavor Health Medical GroupEvanston, IL · 3,350 clinicians
Hospital affiliations
- Northwest Community Hospital 1Arlington Heights, IL
- Presence Saint Joseph Hospital - ChicagoChicago, IL
Industry payments (Open Payments)
- 2025$50,699 · 140 payments from 13 companies
- 2024$97,307 · 198 payments from 15 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $21,529 | 51 |
| Lundbeck LLC | $10,573 | 18 |
| Pfizer Inc. | $7,752 | 20 |
| Impel Pharmaceuticals LLC | $5,258 | 12 |
| Axsome Therapeutics, Inc. | $4,974 | 14 |
What the 2025 payments were for
- Consulting Fee$23,597 · 17 payments
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$12,035 · 4 payments
- Honoraria$11,188 · 7 payments
- Food and Beverage$3,346 · 107 payments
- Travel and Lodging$533.61 · 5 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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