Maria Catalina Merrick, DO
NPI 1629361829ActiveIndividual· Internal Medicine, Infectious Disease· Springfield, IL
Internal Medicine, Infectious Disease (DO) with Zion Specialty PLLC, practicing in Springfield, Illinois. Their prescriptions cost Medicare Part D more than their services did: $3,285,607 for 3,535 claims, against $4,261 paid for services in 2024. Gilead Sciences, Inc. reported $105.37 in payments in 2025, mostly food and beverage. Lists St Josephs Hospital and Medical Center as a hospital affiliation.
Overview
| NPI | 1629361829 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | DO |
| Sole proprietor | No |
| NPI issued | May 20, 2011 |
| Last updated in NPPES | Feb 24, 2020 |
| Certified by provider | Feb 24, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Infectious Disease Primary | 207RI0200X | 036140950 | IL |
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 - Infectious Disease (AZ) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 36 |
|---|---|
| Services billed | 74 across 8 procedure codes |
| Paid by Medicare | $4,261 |
Part D prescriptions in 2024
| Prescriptions (claims) | 3,535 · 4,492 30-day fills |
|---|---|
| Patients | 130 |
| Total drug cost | $3,285,607 |
| Generic share | 63% of claims |
Education and affiliations
| Graduation year | 2011 |
|---|---|
| Medicare specialty | Infectious Disease |
| Secondary specialties | Internal Medicine |
Medical group
- Zion Specialty PLLCPhoenix, AZ · 12 clinicians
Hospital affiliation
- St Josephs Hospital and Medical CenterPhoenix, AZ
Industry payments (Open Payments)
- 2025$105.37 · 1 payment from 1 company
- 2024$113.68 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Gilead Sciences, Inc. | $105.37 | 1 |
What the 2025 payments were for
- Food and Beverage$105.37 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 18 infectious disease specialists in Springfield · All infectious disease specialists in Illinois