Erin Day, DO
NPI 1891589230 · Internal Medicine Physician · Grand Rapids, MI
Enrolled with Medicare as Order and Referring Only - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Erin Day, DO is a Internal Medicine Physician provider in Grand Rapids, MI (NPI 1891589230).
Provider details
- NPI number
- 1891589230
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Female
- Sole proprietor
- No
- License
- 5151017397 (MI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
1 yr in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2025-04-09
- Last updated
- 2026-05-13
- Certified
- 2026-05-13
Frequently asked questions
- What is Erin Day's NPI number?
- Erin Day's National Provider Identifier (NPI) is 1891589230, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Erin Day's specialty?
- Erin Day is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Erin Day located?
- Erin Day's practice location on file with NPPES is 275 Michigan St Ne Fl 9, Grand Rapids, MI 49503-2531.
- What is Erin Day's phone number?
- The practice phone number listed in the NPPES registry for Erin Day is (616) 391-3777.
- Does Erin Day accept Medicare?
- Erin Day is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Erin Day's NPI active?
- Yes — Erin Day's NPI (1891589230) is active in the NPPES registry as of the last update on 2026-05-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.