NPPES file of Aug 9, 2026

Robert C. Day, M.D.

Maternal & Fetal Medicine Physician · Irvine, CA

Robert C. Day, M.D. is a maternal & fetal medicine physician with a practice address in Irvine, California, and NPI 1841618634, issued on Mar 31, 2014. Check the license (California A139689, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1841618634
Name
Robert C. Day
Credential
M.D.
Primary taxonomy
Maternal & Fetal Medicine Physician 207VM0101X
License number
A139689 CA
Self-reported in NPPES; status is on the state search
Practice location
16305 Sand Canyon Ave Ste 225, Irvine, CA 92618
Phone
(949) 763-7451
Enumerated
Mar 31, 2014
Record last updated
Jun 17, 2025
Medicare enrollment
Enrolled (PECOS I20180425001142); accepts Medicare assignment
Medical or professional school
University Of Massachusetts Medical School, 2014
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest maternal & fetal medicine physician records → All 343 in California → Look up another NPI →

Also registered at 16305 Sand Canyon Ave Ste 225

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Michael Haydon, MDMaternal & Fetal Medicine Physician1679584676

Verify Robert C. Day in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license A139689    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the California license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Bills Medicare through one group practice

  1. Hoag ClinicSan Clemente, CA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Robert C. Day among 343 maternal & fetal medicine physician records in California

Robert C. Day, M.D. is one of 343 maternal & fetal medicine physician records with a practice address in California. 61% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2014, is newer than 84% of them.

  • NPI issued2014 · 84% of these records are older, 13% newer
  • In a Medicare fileYes · 61% of these records are
  • In the CMS Doctors and Clinicians fileYes · 53% of these records are
  • Graduated2014 · median 2003 among the 181 with a school on file
  • Record last updated2025 · 51% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207VM0101X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Maternal & Fetal Medicine Physician providers in California

There are 343 maternal & fetal medicine physician records in California.

All 343 in California → Every provider in Irvine → Maternal & Fetal Medicine Physician nationwide →

The 8 maternal & fetal medicine physician records with the nearest ZIP codes

  1. Kristina Galyon, D.O.Irvine, CA 926181730489535
  2. Michael Haydon, MDIrvine, CA 926181679584676
  3. James Kurtzman, M.D.Irvine, CA 926181750495545
  4. Tamerou Asrat, M.D.Newport Beach, CA 926631619980638
  5. Melissa Bush, M.D.Newport Beach, CA 926631942257373
  6. Alex Fong, M.D.Newport Beach, CA 926631114164449
  7. Menashe Kfir, M.D.Newport Beach, CA 926631962411447
  8. David Lagrew, M.D.Newport Beach, CA 926631487601357

Common questions

What is Robert C. Day, M.D.'s NPI number?

Robert C. Day, M.D.'s National Provider Identifier (NPI) is 1841618634, issued on Mar 31, 2014. An NPI identifies a provider in billing; it is not a license.

Where is Robert C. Day, M.D. located?

The NPPES record lists a practice address at 16305 Sand Canyon Ave Ste 225, Irvine, CA, 92618. Phone: (949) 763-7451. Providers update this record themselves, so call before visiting.

How can I verify Robert C. Day, M.D.'s license?

NPPES lists California license number A139689, 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.

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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.