David Solomon De Guzman Chua
NPI 1023268646ActiveIndividual· Internal Medicine· Hawarden, IA
Internal Medicine with Hawarden Regional Healthcare and 1 other group, practicing in Hawarden, Iowa. Their prescriptions cost Medicare Part D more than their services did: $235,697 for 3,466 claims, against $18,382 paid for services in 2024. Bayer Healthcare Pharmaceuticals Inc. was the largest of 7 companies reporting payments in 2025, $187.27 in all, mostly food and beverage. Lists Avera McKennan Hospital & University Health Center and 1 other hospital as hospital affiliations.
Overview
| NPI | 1023268646 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Sole proprietor | No |
| NPI issued | Sep 19, 2008 |
| Last updated in NPPES | Jun 15, 2022 |
| Certified by provider | Jun 15, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | MD-40680 | IA |
| Internal Medicine, Nephrology | 207RN0300X | 40680 | IA |
| Hospitalist | 208M00000X | 40680 | IA |
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 (IA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 87 |
|---|---|
| Services billed | 276 across 19 procedure codes |
| Paid by Medicare | $18,382 |
Part D prescriptions in 2024
| Prescriptions (claims) | 3,466 · 4,170 30-day fills |
|---|---|
| Patients | 262 |
| Total drug cost | $235,697 |
| Generic share | 89% of claims |
Education and affiliations
| Graduation year | 2013 |
|---|---|
| Medicare specialty | Nephrology |
Medical groups
- Hawarden Regional HealthcareHawarden, IA · 23 clinicians
- Hawarden Regional Healthcare Clinics LLCHawarden, IA · 21 clinicians
Hospital affiliations
- Avera McKennan Hospital & University Health CenterSioux Falls, SD
- Hawarden Regional HealthcareHawarden, IA
Other facilities
- Orange City Home HealthHome health agency · Orange City, IA
- Akron Care Center, IncNursing home · Akron, IA
Industry payments (Open Payments)
- 2025$187.27 · 10 payments from 7 companies
- 2024$276.59 · 17 payments from 9 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Bayer Healthcare Pharmaceuticals Inc. | $44.79 | 2 |
| Calliditas Therapeutics US Inc. | $38.13 | 2 |
| Lilly USA, LLC | $32.18 | 2 |
| Iti, Inc. (D/B/A Intra-Cellular Therapies, Inc.) | $25.10 | 1 |
| Viatris Specialty LLC | $16.82 | 1 |
What the 2025 payments were for
- Food and Beverage$187.27 · 10 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records