Ann S. Mercer, M.D.
NPI 1811913502ActiveIndividual· Internal Medicine· Las Cruces, NM
Internal Medicine (M.D.) in Las Cruces, New Mexico, trained at University of Puerto Rico School of Medicine (class of 1978). Their prescriptions cost Medicare Part D more than their services did: $345,336 for 5,601 claims, against $174,222 paid for services in 2024. Viiv Healthcare Company was the largest of 9 companies reporting payments in 2025, $1,196 in all, mostly food and beverage.
Overview
| NPI | 1811913502 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Jul 14, 2006 |
| Last updated in NPPES | Mar 15, 2022 |
| Certified by provider | Mar 1, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 84-79 | NM |
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 - Internal Medicine (NM) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 453 |
|---|---|
| Services billed | 2,819 across 57 procedure codes |
| Paid by Medicare | $174,222 |
Part D prescriptions in 2024
| Prescriptions (claims) | 5,601 · 10,481 30-day fills |
|---|---|
| Patients | 334 |
| Total drug cost | $345,336 |
| Generic share | 87% of claims |
Education and affiliations
| Medical school | University of Puerto Rico School of Medicine |
|---|---|
| Graduation year | 1978 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Hospital affiliations
- Memorial Medical CenterLas Cruces, NM
- Mountain View Regional Medical CenterLas Cruces, NM
- Three Crosses Regional Hospital LLCLas Cruces, NM
Other facilities
- Ambercare Home HealthHome health agency · Las Cruces, NM
- Home Kare Inc of Dona AnaHome health agency · Las Cruces, NM
- Matrix Home Care Services of New Mexico, LLCHome health agency · Las Cruces, NM
- Sierra Home CareHome health agency · Las Cruces, NM
- Tender Care Home HealthHome health agency · Las Cruces, NM
- Las Cruces Village Nursing & Rehabilitation LLCNursing home · Las Cruces, NM
- Las Cruces Wellness & Rehabilitation LLCNursing home · Las Cruces, NM
Industry payments (Open Payments)
- 2025$1,196 · 51 payments from 9 companies
- 2024$929.66 · 41 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Viiv Healthcare Company | $309.36 | 11 |
| Gilead Sciences, Inc. | $255.48 | 10 |
| Abbvie Inc. | $241.22 | 15 |
| Merck Sharp & Dohme LLC | $218.82 | 8 |
| Paratek Pharmaceuticals, Inc. | $48.89 | 2 |
What the 2025 payments were for
- Food and Beverage$1,196 · 51 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 77 internal medicine physicians in Las Cruces · All internal medicine physicians in New Mexico