Thomas Joseph Diamant, MD
NPI 1952310872ActiveIndividual· Internal Medicine, Pulmonary Disease· Costa Mesa, CA
Internal Medicine, Pulmonary Disease (MD) with Mesa Pulmonary Group Inc, practicing in Costa Mesa, California. Their prescriptions cost Medicare Part D more than their services did: $1,311,827 for 2,211 claims, against $299,060 paid for services in 2024. Verona Pharma, Inc. was the largest of 27 companies reporting payments in 2025, $3,731 in all, mostly food and beverage. Lists Hoag Memorial Hospital Presbyterian as a hospital affiliation.
Overview
| NPI | 1952310872 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Aug 7, 2006 |
| Last updated in NPPES | Aug 6, 2024 |
| Certified by provider | Aug 6, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Pulmonary Disease Primary | 207RP1001X | G43620 | CA |
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 - Pulmonary Disease (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 470 |
|---|---|
| Services billed | 3,716 across 37 procedure codes |
| Paid by Medicare | $299,060 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,211 · 3,327 30-day fills |
|---|---|
| Patients | 399 |
| Total drug cost | $1,311,827 |
| Generic share | 57% of claims |
Education and affiliations
| Graduation year | 1979 |
|---|---|
| Medicare specialty | Pulmonary Disease |
| Telehealth | Offers telehealth |
Medical group
- Mesa Pulmonary Group IncCosta Mesa, CA · 6 clinicians
Hospital affiliation
- Hoag Memorial Hospital PresbyterianNewport Beach, CA
Industry payments (Open Payments)
- 2025$3,731 · 167 payments from 27 companies
- 2024$3,012 · 131 payments from 25 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Verona Pharma, Inc. | $496.69 | 19 |
| Genzyme Corporation | $398.77 | 13 |
| Astrazeneca Pharmaceuticals LP | $382.01 | 31 |
| Glaxosmithkline, LLC. | $360.49 | 17 |
| Viatris Specialty LLC | $314.64 | 16 |
What the 2025 payments were for
- Food and Beverage$3,697 · 166 payments
- Education$34.00 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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