Karissa Tan, APN-BC
NPI 1114270899ActiveIndividual· Nurse Practitioner, Adult Health· Las Vegas, NV
Nurse Practitioner, Adult Health (APN-BC) with Optum Medical Group Rhodes P C, practicing in Las Vegas, Nevada. Their prescriptions cost Medicare Part D more than their services did: $2,153,942 for 1,371 claims, against $5,656 paid for services in 2024. Sobi, Inc was the largest of 2 companies reporting payments in 2025, $223.97 in all, mostly food and beverage.
Overview
| NPI | 1114270899 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | APN-BC |
| Sole proprietor | Yes |
| NPI issued | Oct 18, 2012 |
| Last updated in NPPES | Nov 17, 2025 |
| Certified by provider | Nov 17, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Nurse Practitioner, Adult Health Primary | 363LA2200X | APRN002657 | NV |
| Nurse Practitioner, Adult Health | 363LA2200X | 306242 | NY |
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 - Nurse Practitioner (NV); Practitioner - Nurse Practitioner (NY) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 45 |
|---|---|
| Services billed | 94 across 4 procedure codes |
| Paid by Medicare | $5,656 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,371 · 2,118 30-day fills |
|---|---|
| Patients | 432 |
| Total drug cost | $2,153,942 |
| Generic share | 78% of claims |
Education and affiliations
| Graduation year | 2012 |
|---|---|
| Medicare specialty | Nurse Practitioner |
Medical group
- Optum Medical Group Rhodes P CLas Vegas, NV · 51 clinicians
Industry payments (Open Payments)
- 2025$223.97 · 2 payments from 2 companies
- 2024$49.06 · 2 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Sobi, Inc | $124.97 | 1 |
| Janssen Biotech, Inc. | $99.00 | 1 |
What the 2025 payments were for
- Food and Beverage$124.97 · 1 payment
- Education$99.00 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 78 adult health nurse practitioners in Las Vegas · All adult health nurse practitioners in Nevada