Maki Matsumura, NP-C
NPI 1013316488ActiveIndividual· Nurse Practitioner· Walnut Creek, CA
Nurse Practitioner (NP-C) with John Muir Physician Network, practicing in Walnut Creek, California. Their prescriptions cost Medicare Part D more than their services did: $148,594 for 1,782 claims, against $70,460 paid for services in 2024. Exact Sciences Corporation was the largest of 2 companies reporting payments in 2025, $53.05 in all, mostly food and beverage. Lists John Muir Medical Center - Concord Campus and 1 other hospital as hospital affiliations.
Overview
| NPI | 1013316488 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | NP-C |
| Sole proprietor | Yes |
| NPI issued | Aug 21, 2014 |
| Last updated in NPPES | Oct 7, 2022 |
| Certified by provider | Oct 7, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Nurse Practitioner Primary | 363L00000X | 95001105 | CA |
| Nurse Practitioner, Adult Health | 363LA2200X | 95001105 | CA |
| Nurse Practitioner, Gerontology | 363LG0600X | 95001105 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Nurse Practitioner (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 425 |
|---|---|
| Services billed | 1,056 across 31 procedure codes |
| Paid by Medicare | $70,460 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,782 · 3,855 30-day fills |
|---|---|
| Patients | 458 |
| Total drug cost | $148,594 |
| Generic share | 87% of claims |
Education and affiliations
| Graduation year | 2014 |
|---|---|
| Medicare specialty | Nurse Practitioner |
| Telehealth | Offers telehealth |
Medical group
- John Muir Physician NetworkPleasant Hill, CA · 494 clinicians
Hospital affiliations
- John Muir Medical Center - Concord CampusConcord, CA
- John Muir Medical Center - Walnut Creek CampusWalnut Creek, CA
Other facilities
- John Muir Home Health ServicesHome health agency · Concord, CA
Industry payments (Open Payments)
- 2025$53.05 · 2 payments from 2 companies
- 2024$75.82 · 3 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Exact Sciences Corporation | $33.61 | 1 |
| Lilly USA, LLC | $19.44 | 1 |
What the 2025 payments were for
- Food and Beverage$53.05 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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