Rei Masui, MD
Pediatrics · Palo Alto
- Medicare standing
- Clear
- Enrolled, allowed to bill and order, not excluded
- Plans that list them
- 12
- 3 carriers
- Office
- 1
Offices
1 location
Plans that list them
12 plans · 3 carriers
A missing listing does not mean out of network. Directories change, and a listing does not cover every office. Call Dr. Masui’s office at (650) 497-8000 to confirm they take your plan. Ask about the office you use, its medical group, referrals and appointments.
12 of 12 plans
| Alignment Health BreathEasy (HMO C-SNP) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Clarity (HMO C-SNP) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Harmony (HMO) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Heart & Diabetes (HMO C-SNP) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Heart & Diabetes CalPlus (HMO C-SNP) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Heart & Diabetes Care (HMO C-SNP) | Alignment Health Plan | Listed | Sep 28, 2026 |
| Alignment Health Heart & Diabetes Choice (HMO C-SNP) | Alignment Health Plan | Listed | Sep 28, 2026 |
| Alignment Health Honor+ Plan (HMO) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health My Choice CalCare (HMO) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Anthem Full Dual Advantage Aligned (HMO D-SNP) | Anthem Blue Cross | Listed | Oct 3, 2026 |
| Anthem Medicare Advantage (HMO-POS) | Anthem Blue Cross | Listed | Oct 3, 2026 |
| Anthem Prime (HMO-POS) | Anthem Blue Cross Partnership Plan | Listed | Oct 3, 2026 |
California Medical Board record
Licence A69220 · Current
Licensed to practise in California · since 1999 · expires 2027-04-30 · Albert Einstein College of Medicine of Yeshiva University.
No disciplinary actions, convictions, malpractice judgments or citations in this record.
School, training and certification
What this clinician told their state board, medical school and everything before it. Only some states publish this, so nothing here means the state does not say, not that there was no training or certification.
Specialty certification
- American Board of Pediatrics - Pediatrics
Medicaid work
$3,021 in 2024
Medicaid paid $3,021 for 293 billed services this clinician did in 2024, up to 37 people in a month for one service.
Medicaid and CHIP claims where this clinician did the service, fee-for-service and managed care together. Any month with fewer than 11 patients is hidden, so small Medicaid practices undercount.
| Short return visit (20+ min) | 175 | $1,824 |
| Immunization administration through 18 years of age via any route of administration, with counseling by physician or other qualified health care professional; first or only component of each vaccine or toxoid administered | 27 | $635 |
| Return visit (30+ min) | 27 | $450 |
| Screening test, pure tone, air only | 64 | $113 |
| 2024 | 293 | 4 | 37 | $3,021 |
| 2023 | 629 | 9 | 48 | $6,122 |
| 2022 | 1,426 | 15 | 38 | $12,006 |
| 2021 | 806 | 13 | 31 | $1,894 |
| 2020 | 78 | 4 | 19 | $0 |
| 2019 | 1,882 | 7 | 201 | $198,380 |
| 2018 | 4,552 | 10 | 212 | $487,316 |
See the largest Medicaid services in earlier years
2023
| Immunization administration through 18 years of age via any route of administration, with counseling by physician or other qualified health care professional; first or only component of each vaccine or toxoid administered | 84 | $1,661 |
| Periodic comprehensive preventive medicine reevaluation and management of an individual including an age and gender appropriate history, examination, counseling/anticipatory guidance/risk factor reduction interventions, and the ordering of laboratory/diagnostic procedures, established patient; early childhood (age 1 through 4 years) | 17 | $1,333 |
| Infectious agent antigen detection by immunoassay technique (eg, enzyme immunoassay [EIA], enzyme-linked immunosorbent assay [ELISA], fluorescence immunoassay [FIA], immunochemiluminometric assay [IMCA]), qualitative or semiquantitative; severe acute respiratory syndrome coronavirus (eg, SARS-CoV, SARS-CoV-2 [COVID-19]) and influenza virus types A and B | 14 | $1,024 |
| Return visit (30+ min) | 196 | $973 |
| Short return visit (20+ min) | 210 | $857 |
| Immunization administration through 18 years of age via any route of administration, with counseling by physician or other qualified health care professional; each additional vaccine or toxoid component administered (List separately in addition to code for primary procedure) | 14 | $230 |
| Screening test, pure tone, air only | 42 | $44 |
| HEMOGLOBIN | 13 | $0 |
| Bilateral quantitative screening test of visual acuity | 39 | $0 |
2022
| Periodic comprehensive preventive medicine reevaluation and management of an individual including an age and gender appropriate history, examination, counseling/anticipatory guidance/risk factor reduction interventions, and the ordering of laboratory/diagnostic procedures, established patient; late childhood (age 5 through 11 years) | 80 | $2,605 |
| Periodic comprehensive preventive medicine reevaluation and management of an individual including an age and gender appropriate history, examination, counseling/anticipatory guidance/risk factor reduction interventions, and the ordering of laboratory/diagnostic procedures, established patient; adolescent (age 12 through 17 years) | 53 | $2,441 |
| Immunization administration through 18 years of age via any route of administration, with counseling by physician or other qualified health care professional; first or only component of each vaccine or toxoid administered | 218 | $2,376 |
| Periodic comprehensive preventive medicine reevaluation and management of an individual including an age and gender appropriate history, examination, counseling/anticipatory guidance/risk factor reduction interventions, and the ordering of laboratory/diagnostic procedures, established patient; early childhood (age 1 through 4 years) | 13 | $1,101 |
| Infectious agent detection by nucleic acid (DNA or RNA); severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) (coronavirus disease [COVID-19]), amplified probe technique | 14 | $1,001 |
| Short return visit (20+ min) | 274 | $990 |
| Immunization administration through 18 years of age via any route of administration, with counseling by physician or other qualified health care professional; each additional vaccine or toxoid component administered (List separately in addition to code for primary procedure) | 55 | $510 |
| Immunization administration (includes percutaneous, intradermal, subcutaneous, or intramuscular injections); 1 vaccine (single or combination vaccine/toxoid) | 46 | $486 |
| Return visit (30+ min) | 192 | $329 |
| Screening test, pure tone, air only | 174 | $80 |
| Influenza virus vaccine, quadrivalent (IIV4), split virus, preservative free, 0.5 mL dosage, for intramuscular use | 28 | $54 |
| Brief emotional/behavioral assessment (eg, depression inventory, attention-deficit/hyperactivity disorder [ADHD] scale), with scoring and documentation, per standardized instrument | 72 | $34 |
2021
| Return visit (30+ min) | 99 | $615 |
| Short return visit (20+ min) | 156 | $601 |
| Periodic comprehensive preventive medicine reevaluation and management of an individual including an age and gender appropriate history, examination, counseling/anticipatory guidance/risk factor reduction interventions, and the ordering of laboratory/diagnostic procedures, established patient; late childhood (age 5 through 11 years) | 13 | $279 |
| Screening test, pure tone, air only | 122 | $163 |
| Immunization administration by intramuscular injection of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) (coronavirus disease [COVID-19]) vaccine, mRNA-LNP, spike protein, preservative free, 10 mcg/0.2 mL dosage, diluent reconstituted, tris-sucrose formulation; second dose | 24 | $120 |
| Screening performed and negative | 25 | $87 |
| Influenza virus vaccine, quadrivalent (IIV4), split virus, preservative free, 0.5 mL dosage, for intramuscular use | 12 | $9 |
| Immunization administration through 18 years of age via any route of administration, with counseling by physician or other qualified health care professional; first or only component of each vaccine or toxoid administered | 137 | $8 |
| Handling and/or conveyance of specimen for transfer from physician office to laboratory | 35 | $7 |
| Immunization administration (includes percutaneous, intradermal, subcutaneous, or intramuscular injections); 1 vaccine (single or combination vaccine/toxoid) | 43 | $5 |
| Immunization administration by intramuscular injection of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) (coronavirus disease [COVID-19]) vaccine, mRNA-LNP, spike protein, preservative free, 10 mcg/0.2 mL dosage, diluent reconstituted, tris-sucrose formulation; first dose | 15 | $0 |
| Bilateral quantitative screening test of visual acuity | 113 | $0 |
2020
| Immunization administration through 18 years of age via any route of administration, with counseling by physician or other qualified health care professional; first or only component of each vaccine or toxoid administered | 13 | $0 |
| Immunization administration (includes percutaneous, intradermal, subcutaneous, or intramuscular injections); 1 vaccine (single or combination vaccine/toxoid) | 34 | $0 |
| Return visit (30+ min) | 18 | $0 |
| Telehealth transmission, per minute, professional services bill separately | 13 | $0 |
2019
| Clinic visit/encounter, all-inclusive | 969 | $198,233 |
| Short return visit (20+ min) | 416 | $147 |
| Screening test, pure tone, air only | 139 | $0 |
| Bilateral quantitative screening test of visual acuity | 145 | $0 |
| Short return visit | 82 | $0 |
| Periodic comprehensive preventive medicine reevaluation and management of an individual including an age and gender appropriate history, examination, counseling/anticipatory guidance/risk factor reduction interventions, and the ordering of laboratory/diagnostic procedures, established patient; early childhood (age 1 through 4 years) | 57 | $0 |
| Periodic comprehensive preventive medicine reevaluation and management of an individual including an age and gender appropriate history, examination, counseling/anticipatory guidance/risk factor reduction interventions, and the ordering of laboratory/diagnostic procedures, established patient; late childhood (age 5 through 11 years) | 74 | $0 |
2018
| Clinic visit/encounter, all-inclusive | 2,437 | $487,316 |
| Immunization administration through 18 years of age via any route of administration, with counseling by physician or other qualified health care professional; first or only component of each vaccine or toxoid administered | 57 | $0 |
| Screening test, pure tone, air only | 324 | $0 |
| Bilateral quantitative screening test of visual acuity | 338 | $0 |
| Short return visit | 261 | $0 |
| Short return visit (20+ min) | 831 | $0 |
| Return visit (30+ min) | 61 | $0 |
| Periodic comprehensive preventive medicine reevaluation and management of an individual including an age and gender appropriate history, examination, counseling/anticipatory guidance/risk factor reduction interventions, and the ordering of laboratory/diagnostic procedures, established patient; early childhood (age 1 through 4 years) | 114 | $0 |
| Periodic comprehensive preventive medicine reevaluation and management of an individual including an age and gender appropriate history, examination, counseling/anticipatory guidance/risk factor reduction interventions, and the ordering of laboratory/diagnostic procedures, established patient; late childhood (age 5 through 11 years) | 90 | $0 |
| Periodic comprehensive preventive medicine reevaluation and management of an individual including an age and gender appropriate history, examination, counseling/anticipatory guidance/risk factor reduction interventions, and the ordering of laboratory/diagnostic procedures, established patient; adolescent (age 12 through 17 years) | 39 | $0 |
Money from drug and device companies
$21 in 2022
| 2022 | 1 | 1 | None | $21 |
| 2021 | 2 | 2 | None | $49 |
Paid work is consulting, speaking, honoraria and royalties, as opposed to meals and travel.
A payment is not proof that care is biased.
| Merck Sharp & Dohme | Gardasil 9 | $21 | 1 payment
|
See the published payment
| Merck Sharp & Dohme | Meals · 2022-11-29 | Gardasil 9 | $21 |
See earlier years (2021)
2021: $49
| kaleo | Auvi-Q | $25 | 1 payment
|
| GlaxoSmithKline | Bexsero | $24 | 1 payment
|
Professional record
- NPI
- 1790790178
- Licence
- CA A69220California A69220: Current · expires 2027-04-30
More record details
- Sole proprietor
- No
- Taxonomy
- Pediatrics (208000000X)
- Mailing address
- 725 Welch Rd, Palo Alto, CA, 94304
- NPI first listed
- 2006-07-31
- NPI last updated
- 2023-06-06
- NPI record certified
- 2023-06-06
This is when the NPI record was last certified, not a medical board exam.