Medicare Part D Prescribers in Greeley, Colorado
5 flagged and high-volume prescribers across 3 medical specialties.
Data: CMS Medicare Part D, 2023 (most current available) · Updated March 2026
5
Providers
$3.4M
Total Drug Cost
0
High Risk
2.3%
Avg Opioid Rate
Top Prescribers by Drug Cost
| Provider | Claims | Drug Cost |
|---|---|---|
| Mark Berntsen | 25,391 | $2.8M |
| John Berger | 1,085 | $620K |
| Karla Ornelas | N/A | N/A |
| Michelle Williamson | N/A | N/A |
| Natalie Sheehan | N/A | N/A |
Specialties in Greeley
Nurse Practitioner
3 providers
Internal Medicine
1 provider
Pulmonary Disease
1 provider
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Data from CMS Medicare Part D Prescriber Public Use File, 2023. Only providers meeting CMS disclosure thresholds are included. Risk scores are statistical indicators based on prescribing pattern analysis — not allegations of fraud or wrongdoing.