John Alan Sharkey, MMS, PA-C
NPI 1912556002ActiveIndividual· Physician Assistant· Encinitas, CA
Physician Assistant (MMS, PA-C) with Csi Medical Group, practicing in Encinitas, California. 435 Medicare patients in 2024, $137,400 paid; nearly all of their 554 Part D prescriptions were generic (92%). Janssen Biotech, Inc. was the largest of 12 companies reporting payments in 2025, $1,100 in all, mostly food and beverage.
Overview
| NPI | 1912556002 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MMS, PA-C |
| Sole proprietor | No |
| NPI issued | Sep 10, 2019 |
| Last updated in NPPES | Jan 3, 2024 |
| Certified by provider | Jan 3, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Physician Assistant Primary | 363A00000X | 59763 | CA |
| Physician Assistant, Medical | 363AM0700X | 7664 | 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 - Physician Assistant (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 435 |
|---|---|
| Services billed | 2,329 across 61 procedure codes |
| Paid by Medicare | $137,400 |
Part D prescriptions in 2024
| Prescriptions (claims) | 554 · 711 30-day fills |
|---|---|
| Patients | 250 |
| Total drug cost | $162,997 |
| Generic share | 92% of claims |
Education and affiliations
| Graduation year | 2019 |
|---|---|
| Medicare specialty | Physician Assistant |
Medical group
- Csi Medical GroupFullerton, CA · 111 clinicians
Industry payments (Open Payments)
- 2025$1,100 · 64 payments from 12 companies
- 2024$1,660 · 80 payments from 16 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Janssen Biotech, Inc. | $269.70 | 19 |
| Pfizer Inc. | $227.37 | 7 |
| Regeneron Healthcare Solutions, Inc. | $213.22 | 14 |
| Abbvie Inc. | $163.01 | 13 |
| Genzyme Corporation | $66.55 | 3 |
What the 2025 payments were for
- Food and Beverage$1,041 · 63 payments
- Education$58.77 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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