Christopher Hemmer, ANP
NPI 1700802659ActiveIndividual· Nurse Practitioner· Saint Peters, MO
Nurse Practitioner (ANP) with Mercy Clinic Surgical Specialists LLC, practicing in Saint Peters, Missouri. 239 Medicare patients in 2024, $24,820 paid; nearly all of their 366 Part D prescriptions were generic (95%). Vertex Pharmaceuticals Incorporated was the largest of 5 companies reporting payments in 2025, $1,510 in all, mostly travel and lodging. Lists Mercy Hospital Jefferson and 3 other hospitals as hospital affiliations.
Overview
| NPI | 1700802659 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | ANP |
| Sole proprietor | No |
| NPI issued | Jul 14, 2006 |
| Last updated in NPPES | Dec 9, 2015 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Nurse Practitioner Primary | 363L00000X | 138546 | MO |
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 - Nurse Practitioner (MO); Practitioner - Nurse Practitioner (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 239 |
|---|---|
| Services billed | 340 across 52 procedure codes |
| Paid by Medicare | $24,820 |
Part D prescriptions in 2024
| Prescriptions (claims) | 366 · 379 30-day fills |
|---|---|
| Patients | 209 |
| Total drug cost | $9,321 |
| Generic share | 95% of claims |
Education and affiliations
| Graduation year | 2012 |
|---|---|
| Medicare specialty | Nurse Practitioner |
Medical group
- Mercy Clinic Surgical Specialists LLCSaint Louis, MO · 182 clinicians
Hospital affiliations
- Mercy Hospital JeffersonCrystal City, MO
- Mercy Hospital SouthSaint Louis, MO
- Mercy Hospital St LouisSaint Louis, MO
- St Lukes HospitalChesterfield, MO
Industry payments (Open Payments)
- 2025$1,510 · 10 payments from 5 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Vertex Pharmaceuticals Incorporated | $1,346 | 6 |
| Astrazeneca Pharmaceuticals LP | $79.24 | 1 |
| Augmedics Inc. | $35.93 | 1 |
| Providence Medical Technology, Inc. | $24.74 | 1 |
| Aesculap, Inc. | $23.86 | 1 |
What the 2025 payments were for
- Travel and Lodging$1,258 · 3 payments
- Food and Beverage$252.25 · 7 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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