Michael Gribble, MD
NPI 1881396307 · Student in an Organized Health Care Education/Training Program · Riverside, CA
Enrolled with Medicare as Order and Referring Only - Radiation Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael Gribble, MD is a Student in an Organized Health Care Education/Training Program provider in Riverside, CA (NPI 1881396307).
Provider details
- NPI number
- 1881396307
- Entity type
- Individual
- Primary specialty
- Student in an Organized Health Care Education/Training ProgramStudent, Health Care
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
Specialties & taxonomies
Student, Health Care
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
83% 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.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$156 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
Registry dates
- Enumerated
- 2023-03-20
- Last updated
- 2023-03-23
- Certified
- 2023-03-23
Frequently asked questions
- What is Michael Gribble's NPI number?
- Michael Gribble's National Provider Identifier (NPI) is 1881396307, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Gribble's specialty?
- Michael Gribble is listed in the NPPES registry with a primary specialty of Student in an Organized Health Care Education/Training Program (Student, Health Care).
- Where is Michael Gribble located?
- Michael Gribble's practice location on file with NPPES is 4510 Brockton Ave Ste 253, Riverside, CA 92501-4020.
- What is Michael Gribble's phone number?
- The practice phone number listed in the NPPES registry for Michael Gribble is (951) 495-9995.
- Does Michael Gribble accept Medicare?
- Michael Gribble is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael Gribble's NPI active?
- Yes — Michael Gribble's NPI (1881396307) is active in the NPPES registry as of the last update on 2023-03-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.