Nicholas Rieken, FNP
NPI 1306554274 · Family Nurse Practitioner · Union City, CA
Enrolled with Medicare as Order and Referring Only - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Nicholas Rieken, FNP is a Family Nurse Practitioner provider in Union City, CA (NPI 1306554274).
Provider details
- NPI number
- 1306554274
- Entity type
- Individual
- Primary specialty
- Family Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- FNP
- Sex
- Male
- Sole proprietor
- Yes
- License
- 95022293 (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 tenure33% of score
3 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
2 documented practice locations
- 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 · 11 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 30 | 17 |
| Amlodipine Besylate | 28 | — |
| Metformin Hcl | 27 | — |
| Furosemide | 20 | — |
| Losartan Potassium | 19 | 14 |
| Metformin Hclbrand: Metformin Hcl Er | 16 | — |
| Lisinopril |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$33 across 1 record (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
Additional practice locations (1)
- 1800 H St Rm 80Union City, CA 94587-3321Phone: (510) 471-5880
Registry dates
- Enumerated
- 2022-11-09
- Last updated
- 2026-04-27
- Certified
- 2026-04-27
Frequently asked questions
- What is Nicholas Rieken's NPI number?
- Nicholas Rieken's National Provider Identifier (NPI) is 1306554274, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Nicholas Rieken's specialty?
- Nicholas Rieken is listed in the NPPES registry with a primary specialty of Family Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Nicholas Rieken located?
- Nicholas Rieken's practice location on file with NPPES is 33255 9th St., Union City, CA 94587.
- What is Nicholas Rieken's phone number?
- The practice phone number listed in the NPPES registry for Nicholas Rieken is (818) 378-2675.
- Does Nicholas Rieken accept Medicare?
- Nicholas Rieken is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Nicholas Rieken's NPI active?
- Yes — Nicholas Rieken's NPI (1306554274) is active in the NPPES registry as of the last update on 2026-04-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.