Mark Demshick, CRNA
NPI 1831655521ActiveIndividual· Nurse Anesthetist, Certified Registered· Doylestown, PA
Nurse Anesthetist, Certified Registered (CRNA) in Doylestown, Pennsylvania, licensed in PA, with an NPI issued in February 2019. Medicare paid $33,090 for services to 237 patients in 2024. Janssen Biotech, Inc. was the largest of 2 companies reporting payments in 2025, $58.19 in all, mostly food and beverage.
Overview
| NPI | 1831655521 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | CRNA |
| Sole proprietor | No |
| NPI issued | Feb 18, 2019 |
| Last updated in NPPES | Feb 18, 2019 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Nurse Anesthetist, Certified Registered Primary | 367500000X | RN629539 | PA |
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 - Certified Registered Nurse Anesthetist (CRNA) (PA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 237 |
|---|---|
| Services billed | 243 across 31 procedure codes |
| Paid by Medicare | $33,090 |
Industry payments (Open Payments)
- 2025$58.19 · 3 payments from 2 companies
- 2024$49.65 · 2 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Janssen Biotech, Inc. | $41.40 | 2 |
| Abbott Laboratories | $16.79 | 1 |
What the 2025 payments were for
- Food and Beverage$58.19 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 21 nurse anesthetists in Doylestown · All nurse anesthetists in Pennsylvania