Doctor profile · Federal record
Dr. Marissa Grillo, PA-C
Physician Assistant · Medical Physician Assistant · Stanford, CA
- NPI 1629650635
- Accepts Medicare
- MIPS 75.5 / 100 · 2023
- 4 yrs in practice
- Female
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
300 Pasteur Dr
Stanford, CA 943052200
(650) 723-4000
Credentials & registration
- NPI registered
- April 2021 — 5 yrs on file
- Profile last updated
- October 29, 2025
- Year of graduation
- 2022 — 4 yrs since
- Specialty taxonomy
- 363A00000X — NUCC code
- State license (1)
- California #61043
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1629650635. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
22
Distinct HCPCS
1
Medicare allowed
$4,411
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99291 |
Critical care, first 30-74 minutes | 22 | 21 | $201 |
In context: peer comparison
Among 89 peers in this city , average services per provider: 64. This provider delivers 0.3× the peer median.Hospital affiliations
Frequently asked questions
What is Dr. Marissa Grillo's medical specialty?
Dr. Marissa Grillo practices Physician Assistant in Stanford, CA.
Where does Dr. Marissa Grillo practice?
Dr. Marissa Grillo practices at 300 Pasteur Dr, Stanford, CA 943052200. Office phone: 6507234000.
What is Dr. Marissa Grillo's NPI?
Dr. Marissa Grillo's National Provider Identifier (NPI) is 1629650635, issued by NPPES.
Does Dr. Marissa Grillo accept Medicare assignment?
Yes. Dr. Marissa Grillo accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Marissa Grillo commonly perform?
Top Medicare-reported procedures in 2023: Critical care (HCPCS 99291). Source: CMS Medicare Physician & Other Practitioners file.