Brigid Riordan, NP-C
NPI 1568835833 · Primary Care Nurse Practitioner · Norco, CA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Brigid Riordan, NP-C is a Primary Care Nurse Practitioner provider in Norco, CA (NPI 1568835833).
Provider details
- NPI number
- 1568835833
- Entity type
- Individual
- Primary specialty
- Primary Care Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- NP-C
- Sex
- Female
- Sole proprietor
- No
- License
- 95003364 (CA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Physician Assistants & Advanced Practice Nursing Providers
Physician Assistants & Advanced Practice Nursing Providers
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
10 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 73 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Rosuvastatin Calcium | 113 | 36 |
| Atorvastatin Calcium | 104 | 32 |
| Lisinopril | 104 | 28 |
| Levothyroxine Sodium | 102 | 35 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 88 | 35 |
| Omeprazole | 73 | 23 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$384 across 25 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
- 2015-11-08
- Last updated
- 2015-11-08
Frequently asked questions
- What is Brigid Riordan's NPI number?
- Brigid Riordan's National Provider Identifier (NPI) is 1568835833, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Brigid Riordan's specialty?
- Brigid Riordan is listed in the NPPES registry with a primary specialty of Primary Care Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Brigid Riordan located?
- Brigid Riordan's practice location on file with NPPES is 1901 Town and Country Dr, Norco, CA 92860-3611.
- What is Brigid Riordan's phone number?
- The practice phone number listed in the NPPES registry for Brigid Riordan is (951) 737-8141.
- Does Brigid Riordan accept Medicare?
- Brigid Riordan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Brigid Riordan's NPI active?
- Yes — Brigid Riordan's NPI (1568835833) is active in the NPPES registry as of the last update on 2015-11-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.