Eric Day, MD
Hospitalist Physician · Santa Cruz, CA
Eric Day, MD is a hospitalist physician with a practice address in Santa Cruz, California, and NPI 1316443534, issued on Apr 5, 2018. Check the license (California A166078, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Eric Day
- Credential
- MD
- Primary taxonomy
- Hospitalist Physician 208M00000X
- License number
- A166078 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1595 Soquel Dr Ste 400, Santa Cruz, CA 95065
- Phone
- (831) 475-1111
- Enumerated
- Apr 5, 2018
- Record last updated
- Jul 18, 2023
- Fax
- (831) 476-5020
- Medicare enrollment
- Enrolled (PECOS I20210602002074); accepts Medicare assignment
- Medical or professional school
- University Of Vermont College Of Medicine, 2018
- Entity
- Type 1 · individual
8 nearest hospitalist physician records → All 3,099 in California → Look up another NPI →
Also registered at 1595 Soquel Dr Ste 400
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Kellye Campos, NPFamily Nurse Practitioner1073523361
Verify Eric Day in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A166078Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
57% fewer Medicare Part D claims than the average hospitalist physician in 2024
222 Medicare Part D claims for 107 beneficiaries, against an average of 521 among the 21,613 providers of this specialty who prescribed in Part D. 18 claims were for opioids.
Most prescribed
- Amoxicillin-Clavulanate Potass17 claims
- Metoprolol Succinate15 claims
- Atorvastatin Calcium12 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 96.5 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Dignity Health Medical FoundationSanta Cruz, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Eric Day among 3,099 hospitalist physician records in California
Eric Day, MD is one of 3,099 hospitalist physician records with a practice address in California. 90% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 77% of them.
- NPI issued2018 · 77% of these records are older, 19% newer
- In a Medicare fileYes · 90% of these records are
- In the CMS Doctors and Clinicians fileYes · 81% of these records are
- Graduated2018 · median 2010 among the 2,505 with a school on file
- Record last updated2023 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208M00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hospitalist Physician providers in California
There are 3,099 hospitalist physician records in California.
All 3,099 in California → Every provider in Santa Cruz → Hospitalist Physician nationwide →
The 8 hospitalist physician records with the nearest ZIP codes
- Jenifer Butler, M.D.Santa Cruz, CA 950651902950538
- William Cao, MDSanta Cruz, CA 950651932189529
- Cesar Castillo, MDSanta Cruz, CA 950651578735148
- Yolanda Cuadros, MDSanta Cruz, CA 950651619987203
- Richard Hamner, MDSanta Cruz, CA 950651588660401
- Rema Hanna, MDSanta Cruz, CA 950651265571202
- Donaldo Hernandez, M.D.Santa Cruz, CA 950651588644470
- Nhat Hoang, DOSanta Cruz, CA 950651215196480
Common questions
What is Eric Day, MD's NPI number?
Eric Day, MD's National Provider Identifier (NPI) is 1316443534, issued on Apr 5, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Eric Day, MD located?
The NPPES record lists a practice address at 1595 Soquel Dr Ste 400, Santa Cruz, CA, 95065. Phone: (831) 475-1111. Providers update this record themselves, so call before visiting.
How can I verify Eric Day, MD's license?
NPPES lists California license number A166078, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Eric Day, MD prescribe under Medicare Part D?
In 2024, Eric Day, MD had 222 Medicare Part D claims for 107 beneficiaries; the average among hospitalist physician prescribers was 521. Part D covers Medicare prescriptions only.
What is Eric Day, MD's MIPS final score?
The 2023 MIPS final score is 96.5 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.