Dr. Rei Masui, MD
- Hospital affiliations
- 1
- Industry payments
- $162
- Medical groups
- 2
- Insurance carriers
- 6
- State license
- 1
- Practice address
- 725 Welch Road, Palo Alto, CA 94304
- Practice phone
- Call (650) 497-8000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Masui's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Rei Masui is a pediatrician in Palo Alto, California
Dr. Masui practices at Lucile Packard Children's Hospital Stanford in Palo Alto, California, part of Stanford University.
Dr. Masui's NPI, 1790790178, was assigned on July 31, 2006. Dr. Masui graduated from Albert Einstein College of Medicine in 1996. Dr. Masui holds California license A69220.
- NPI
- 1790790178NPI Registry (opens in a new tab)
- NPI enumeration date
- July 31, 2006
- NPI status
- Active
- Practice phone
- (650) 497-8000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Medical school graduation
- 1996
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Rei Masui practices at Lucile Packard Children's Hospital Stanford in Palo Alto, California
Dr. Masui's primary practice is Lucile Packard Children's Hospital Stanford, at 725 Welch Road, Palo Alto, CA 94304 in Santa Clara County. The practice phone is (650) 497-8000.
- Lucile Packard Children's Hospital Stanford725 Welch Road, Palo Alto, CA 94304 · Santa Clara CountyPhone(650) 497-8000
Source: Dmand AI Affiliation Data
Dr. Rei Masui is affiliated with 1 site of care and 2 medical groups
Dr. Masui's primary practice is Lucile Packard Children's Hospital Stanford in Palo Alto, California, part of Stanford University. The medical group on file is The Permanente Medical Group, Inc. Dmand AI also links Dr. Masui to 1 more medical group, named with a free account. Dr. Masui's employer is on file too: a hospital.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Rei Masui's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Masui practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Lucile Packard Children's Hospital Stanford | Available with a free account |
| +1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Stanford University and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Rei Masui is one of 8,236 pediatricians in California
Pediatrics is Dr. Masui's primary specialty in the NPI Registry, under taxonomy code 208000000X. Dr. Masui is board certified in pediatrics by the American Board of Pediatrics. Dr. Masui is licensed in California.
Specialties and state licenses
- Pediatrics, CaliforniaPrimary
Pediatricians near Dr. Masui
Counts of pediatricians with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Rei Masui's patients have a median age of 9
Across all payers, Dmand AI patient panel data puts Dr. Masui's median patient age at 9, with 51% women.
Dr. Masui's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 9
Patient panel by sex, all payers
- Women51%
- Men48%
Source: Dmand AI Patient Panel Data
Dr. Rei Masui received $162 in industry payments from 2016 to 2022
CMS Open Payments shows 8 general payments to Dr. Masui from 8 drug and device companies from 2016 to 2022. Food and beverage make up the largest share, 100% of the total. Sanofi Pasteur Inc. paid the most, $28.
General payments to Dr. Masui by program year, 2016 to 2022
Companies that paid Dr. Masui the most, 2016 to 2022
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Rei Masui graduated from Albert Einstein College of Medicine
Dr. Masui graduated from Albert Einstein College of Medicine in 1996.
- Medical school
- Board certified in pediatrics
Source: Dmand AI Professional Profile Data
Dr. Rei Masui accepts plans from 6 insurance carriers
Dr. Masui is in network with 6 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. Medicare plans come from the most carriers, 6. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Michigan
- United Healthcare
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Regence Health Plans
Plan types Dr. Masui accepts, by number of carriers
- Medicare6
- PPO6
- HMO3
- POS3
- EPO1
Source: Dmand AI Insurance Network Data
Sources for Dr. Rei Masui's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Rei Masui
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Rei Masui's NPI number?
Dr. Rei Masui's NPI number is 1790790178. It was assigned on July 31, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Rei Masui?
Dr. Rei Masui is a pediatrician in Palo Alto, California. The primary specialty in the NPI Registry is Pediatrics Physician (taxonomy code 208000000X).
Where does Dr. Rei Masui practice?
Dr. Masui practices at 725 Welch Road, Palo Alto, CA 94304. Dr. Masui's primary practice is Lucile Packard Children's Hospital Stanford in Palo Alto, California, part of Stanford University. Dmand AI also links Dr. Masui to 1 medical group.
What is Dr. Rei Masui's office phone number?
The practice phone on file for Dr. Masui is (650) 497-8000.
What is Dr. Rei Masui's medical license number?
Dr. Masui holds California license A69220.
Which hospitals is Dr. Rei Masui affiliated with?
Dr. Masui practices at Lucile Packard Children's Hospital Stanford in Palo Alto, California.
What medical group is Dr. Rei Masui part of?
Dr. Masui is linked to The Permanente Medical Group, Inc. Dmand AI links Dr. Masui to 1 more medical group.
Is Dr. Rei Masui board certified?
Yes. Dr. Masui is board certified in pediatrics by the American Board of Pediatrics.
Where did Dr. Rei Masui go to medical school?
Dr. Masui graduated from Albert Einstein College of Medicine in 1996.
Has Dr. Rei Masui received payments from drug or device companies?
CMS Open Payments shows $162 in general payments to Dr. Masui from 8 companies from 2016 to 2022. The largest total came from Sanofi Pasteur Inc.
How long has Dr. Rei Masui been practicing?
Dr. Masui graduated from medical school in 1996, 30 years ago.
What insurance does Dr. Rei Masui accept?
Dr. Masui is in network with 6 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. Medicare plans come from the most carriers, 6. Check the plan with the practice before a visit.
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