Andrew C. Johnston, MD
NPI 1710931019ActiveIndividual· Internal Medicine· Carmel, CA
Internal Medicine (MD) in Carmel, California, trained at Northwestern University Feinberg Medical School (class of 1986). Their prescriptions cost Medicare Part D more than their services did: $1,011,455 for 10,715 claims, against $942.62 paid for services in 2024.
Overview
| NPI | 1710931019 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | May 20, 2006 |
| Last updated in NPPES | Oct 30, 2020 |
| Certified by provider | Oct 29, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | G88534 | CA |
| Internal Medicine | 207R00000X | 25495 | AZ |
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 - Internal Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 77 |
|---|---|
| Services billed | 132 across 10 procedure codes |
| Paid by Medicare | $942.62 |
Part D prescriptions in 2024
| Prescriptions (claims) | 10,715 · 22,118 30-day fills |
|---|---|
| Patients | 532 |
| Total drug cost | $1,011,455 |
| Generic share | 84% of claims |
Education and affiliations
| Medical school | Northwestern University Feinberg Medical School |
|---|---|
| Graduation year | 1986 |
| Medicare specialty | Internal Medicine |
Medical group
- Open Door Community Health CentersArcata, CA · 114 clinicians
Hospital affiliations
- Jerold Phelps Community HospitalGarberville, CA
- Mad River Community HospitalArcata, CA
- Providence Redwood Memorial HospitalFortuna, CA
- Providence St Joseph HospitalEureka, CA
Other facilities
- Providence at Home With Compassus Home Health, HumboldtHome health agency · Eureka, CA
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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