Mark Massi, MD
Pediatrics Physician · Riverside, CA
Mark Massi, MD is a pediatrics physician with a practice address in Riverside, California, and NPI 1568417921, issued on May 24, 2006. Check the license (California A105417, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Mark Massi
- Credential
- MD
- Primary taxonomy
- Pediatrics Physician 208000000X
- License number
- A105417 CA
Self-reported in NPPES; status is on the state search - Practice location
- 10800 Magnolia Ave, Riverside, CA 92505
- Phone
- (951) 353-5741
- Enumerated
- May 24, 2006
- Record last updated
- Oct 14, 2016 (not updated in 10 years: call before relying on the address or phone)
- Fax
- (951) 353-5375
- Entity
- Type 1 · individual
8 nearest pediatrics physician records → All 9,272 in California → Look up another NPI →
Also registered at 10800 Magnolia Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Kimberly Adams, PA-CMedical Physician Assistant1053522870
- Alfredo Aguiar, PAPhysician Assistant1043368970
- Michael Aguinaldo, M.D.Pediatrics Physician1851531487
- Maria Aguirre, MDPediatrics Physician1295806255
Verify Mark Massi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A105417Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Mark Massi among 9,272 pediatrics physician records in California
Mark Massi, MD is one of 9,272 pediatrics physician records with a practice address in California. 31% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2006, is newer than 4% of them.
- NPI issued2006 · 4% of these records are older, 56% newer
- In a Medicare fileNo · 31% of these records are
- In the CMS Doctors and Clinicians fileNo · 8% of these records are
- Record last updated2016 · 65% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208000000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Pediatrics Physician providers in California
There are 9,272 pediatrics physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 9,272 in California → Every provider in Riverside → Pediatrics Physician nationwide →
The 8 pediatrics physician records with the nearest ZIP codes
- Maria Aguirre, MDRiverside, CA 925051295806255
- Sofronio Basical, MDRiverside, CA 925051508933425
- Rhoda Blum, MDRiverside, CA 925051710046388
- Connell Bost, MDRiverside, CA 925051629137385
- Janeth Ceja, MDRiverside, CA 925051346309002
- Christopher DaelRiverside, CA 925051104990662
- Emily Garabedian, MDRiverside, CA 925051790844454
- Dimple Khona, MDRiverside, CA 925051245307156
Common questions
What is Mark Massi, MD's NPI number?
Mark Massi, MD's National Provider Identifier (NPI) is 1568417921, issued on May 24, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark Massi, MD located?
The NPPES record lists a practice address at 10800 Magnolia Ave, Riverside, CA, 92505. Phone: (951) 353-5741. Providers update this record themselves, so call before visiting.
How can I verify Mark Massi, MD's license?
NPPES lists California license number A105417, 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. 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.