Patricia Grinnell, NP
NPI 1538186457 · Nurse Practitioner · Petaluma, CA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Patricia Grinnell, NP is a Nurse Practitioner provider in Petaluma, CA (NPI 1538186457).
Provider details
- NPI number
- 1538186457
- Entity type
- Individual
- Primary specialty
- Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- NP
- Sex
- Female
- Sole proprietor
- No
- License
- 397558 (CA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
573 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 276 | $124 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 134 | $172 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 85 | $14 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 58 | $88 |
| Telephone Medical Discussion With Physician, 11-20 Minutes99442 | 20 | $88 |
Typical Medicare-allowed amounts for these services range $14–$172 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 11 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Lidocaine/Prilocainebrand: Lidocaine-Prilocaine | 42 | 36 |
| Prochlorperazine Maleate | 37 | 26 |
| Dexamethasone | 36 | 28 |
| Olanzapine | 31 | 23 |
| Prednisone | 30 | 13 |
| Anastrozole | 28 | 13 |
| Ondansetron Hcl | 27 | 22 |
| Levothyroxine Sodium |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$131 across 7 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-16
- Last updated
- 2021-11-02
- Certified
- 2021-11-02
Frequently asked questions
- What is Patricia Grinnell's NPI number?
- Patricia Grinnell's National Provider Identifier (NPI) is 1538186457, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Patricia Grinnell's specialty?
- Patricia Grinnell is listed in the NPPES registry with a primary specialty of Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Patricia Grinnell located?
- Patricia Grinnell's practice location on file with NPPES is 110 Lynch Creek Way Ste a, Petaluma, CA 94954-2337.
- What is Patricia Grinnell's phone number?
- The practice phone number listed in the NPPES registry for Patricia Grinnell is (707) 763-0600.
- Does Patricia Grinnell accept Medicare?
- Patricia Grinnell is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Patricia Grinnell's NPI active?
- Yes — Patricia Grinnell's NPI (1538186457) is active in the NPPES registry as of the last update on 2021-11-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.