Dr. Thomas Rey Yamamoto, MD
- Medicare services, 2022
- 24
- Medicare patients, 2024
- 21
- Part D claims, 2024
- 90
- Industry payments
- $585
- Affiliated sites
- 2
- Practice address
- 44815 Fig Avenue, Suite 100, Lancaster, CA 93534
- Practice phone
- Call (626) 479-8383
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Acuity Eye Group - Trinity Surgical Solutions
Surgery Center - Medicare-Certified · Lancaster, California
Find Dr. Yamamoto'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. Thomas Rey Yamamoto is an OB-GYN in San Gabriel, California
Dr. Yamamoto practices at Acuity Eye Group - Trinity Surgical Solutions in Lancaster, California.
Dr. Yamamoto's NPI, 1083633457, was assigned on July 18, 2006. Dr. Yamamoto graduated from UC San Diego School of Medicine in 1988. Dr. Yamamoto holds California license G66872.
- NPI
- 1083633457NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6709811425
- NPI enumeration date
- July 18, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (626) 479-8383
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 64
- Medical school graduation
- 1988
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Thomas Rey Yamamoto practices in Lancaster and San Gabriel
Dr. Yamamoto's primary practice is Acuity Eye Group - Trinity Surgical Solutions, at 44815 Fig Avenue, Suite 100, Lancaster, CA 93534. The practice phone is (626) 479-8383. Dr. Yamamoto also practices at Trinity Surgical Solutions, Inc, 207 S Santa Anita St, San Gabriel, CA 91776.
- Acuity Eye Group - Trinity Surgical SolutionsPrimary44815 Fig Avenue, Suite 100, Lancaster, CA 93534Phone(626) 479-8383
- Trinity Surgical Solutions, Inc207 S Santa Anita St, San Gabriel, CA 91776 · Los Angeles CountyPhone(844) 408-6589
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; and Dmand AI Practice Data
Dr. Thomas Rey Yamamoto is affiliated with 2 sites of care and 1 medical group
Dr. Yamamoto's primary practice is Acuity Eye Group - Trinity Surgical Solutions in Lancaster, California. The medical group on file is Optum - Downtown Los Angeles. Dmand AI also links Dr. Yamamoto to 1 more group practice or clinic, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Thomas Rey Yamamoto's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Yamamoto practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Acuity Eye Group - Trinity Surgical Solutions | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Thomas Rey Yamamoto is one of 4,642 OB-GYNs in California
Obstetrics and gynecology is Dr. Yamamoto's primary specialty in the NPI Registry, under taxonomy code 207V00000X. Dr. Yamamoto is board certified in obstetrics & gynecology by the American Board of Obstetrics and Gynecology. Dr. Yamamoto is licensed in California.
Specialties and state licenses
- Obstetrics and gynecology, CaliforniaPrimary
Clinical focus
Dmand AI lists menopause, ovarian cyst and vaginal infection among the conditions Dr. Yamamoto treats.
OB-GYNs near Dr. Yamamoto
Counts of OB-GYNs 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. Thomas Rey Yamamoto billed Medicare for 24 services in 2022
CMS data shows 24 Medicare services from Dr. Yamamoto across 2 procedure codes in 2022, for 21 Medicare patients. Medicare paid $1,383 for them. Every service was in an office.
Dr. Yamamoto's Medicare services by type, 2019 to 2022
- 2019
- 2022
- Office and hospital visits
- 2019: 152022: 1313%
- Other services
- 2019: 02022: 11
Dr. Yamamoto compared with the California median for OB-GYNs, 2022
- Dr. Yamamoto
- California median
- Medicare services
- 24vs 5859% below
- Medicare patients
- 21vs 5260% below
- Part D claims
- 32vs 359% below
Medians across 3,823 OB-GYNs in California with Dmand AI profiles that report each measure.
Dr. Yamamoto's most billed Medicare procedure codes, 2022
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Yamamoto?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Yamamoto and other OB-GYNs in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Thomas Rey Yamamoto treated 21 Medicare patients in 2024, average age 68
CMS counts 21 Medicare patients who saw Dr. Yamamoto in 2024. 62% of them have high cholesterol, and 57% have high blood pressure. Their average risk score is 0.64, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Yamamoto's median patient age at 45, with 99% women.
Chronic conditions among Dr. Yamamoto's Medicare patients, 2024
- High cholesterol62%
- High blood pressure57%
Share of Medicare patients with each condition. A patient can have several.
Dr. Yamamoto's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 45
Patient panel by sex, all payers
- Women99%
- Men0%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Thomas Rey Yamamoto wrote 90 Medicare Part D claims in 2024
In 2024, Dr. Yamamoto wrote 90 Medicare Part D claims for 36 patients. 88% of them were for generic drugs. CMS names the drug for 32 of them, across 2 drugs with 11 or more claims each, at $691 in total drug cost. In 2023, CMS named 12 claims across 1 drug.
Dr. Yamamoto's Part D claims by kind of drug, 2024
- Generic79 claims88%
- Brand-name11 claims12%
Dr. Yamamoto's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Yamamoto's Part D claims, 2024
- Antibiotics26%23 of 90 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 122024: 32167%
Drugs named by CMS: 2 in 2024, 1 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Thomas Rey Yamamoto takes part in Medicare
Dr. Yamamoto accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Thomas Rey Yamamoto received $585 in industry payments from 2016 to 2021
CMS Open Payments shows 24 general payments to Dr. Yamamoto from 6 drug and device companies from 2016 to 2021. Food and beverage make up the largest share, 100% of the total. Abbvie Inc. paid the most, $210.
General payments to Dr. Yamamoto by program year, 2016 to 2021
Companies that paid Dr. Yamamoto the most, 2016 to 2021
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Thomas Rey Yamamoto graduated from UC San Diego School of Medicine
Dr. Yamamoto graduated from UC San Diego School of Medicine in 1988.
- Medical school
- Board certified in obstetrics & gynecology
Source: Dmand AI Professional Profile Data
Dr. Thomas Rey Yamamoto accepts plans from 13 insurance carriers
Dr. Yamamoto is in network with 13 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. Medicare plans come from the most carriers, 9. 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
- LA Care
- Regence Health Plans
- Aspirus Health Plan
- +5 more carriersWith a free account
Plan types Dr. Yamamoto accepts, by number of carriers
- Medicare9
- PPO7
- HMO5
- POS4
- EPO2
Source: Dmand AI Insurance Network Data
Sources for Dr. Thomas Rey Yamamoto'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Affiliation DataDmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| 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. Thomas Rey Yamamoto
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. Thomas Rey Yamamoto's NPI number?
Dr. Thomas Rey Yamamoto's NPI number is 1083633457. It was assigned on July 18, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Thomas Rey Yamamoto?
Dr. Thomas Rey Yamamoto is an OB-GYN in San Gabriel, California. The primary specialty in the NPI Registry is Obstetrics & Gynecology Physician (taxonomy code 207V00000X).
Where does Dr. Thomas Rey Yamamoto practice?
Dr. Yamamoto practices at 44815 Fig Avenue, Suite 100, Lancaster, CA 93534. Dr. Yamamoto also practices at 207 S Santa Anita St, San Gabriel, CA 91776. Dr. Yamamoto's primary practice is Acuity Eye Group - Trinity Surgical Solutions in Lancaster, California. Dmand AI also links Dr. Yamamoto to 1 group practice or clinic.
What is Dr. Thomas Rey Yamamoto's office phone number?
The practice phone on file for Dr. Yamamoto is (626) 479-8383.
What is Dr. Thomas Rey Yamamoto's medical license number?
Dr. Yamamoto holds California license G66872.
What medical group is Dr. Thomas Rey Yamamoto part of?
Dr. Yamamoto is linked to Optum - Downtown Los Angeles.
Does Dr. Thomas Rey Yamamoto accept Medicare?
Yes. CMS data shows Dr. Yamamoto billed Medicare for 24 services in 2022, and Dr. Yamamoto accepts Medicare assignment.
How many Medicare patients does Dr. Thomas Rey Yamamoto see?
CMS counts 21 Medicare patients who saw Dr. Yamamoto in 2024, with an average age of 68.
Is Dr. Thomas Rey Yamamoto board certified?
Yes. Dr. Yamamoto is board certified in obstetrics & gynecology by the American Board of Obstetrics and Gynecology.
What services does Dr. Thomas Rey Yamamoto bill to Medicare?
In 2022, Dr. Yamamoto's most billed Medicare services were office visit, established patient (99213) and medicare service (G0101).
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Where did Dr. Thomas Rey Yamamoto go to medical school?
Dr. Yamamoto graduated from UC San Diego School of Medicine in 1988.
What drugs does Dr. Thomas Rey Yamamoto prescribe most?
In 2024 Medicare Part D data, Dr. Yamamoto's most prescribed drugs by claims were Clotrimazole-Betamethasone and Nitrofurantoin.
Has Dr. Thomas Rey Yamamoto received payments from drug or device companies?
CMS Open Payments shows $585 in general payments to Dr. Yamamoto from 6 companies from 2016 to 2021. The largest total came from Abbvie Inc.
How long has Dr. Thomas Rey Yamamoto been practicing?
Dr. Yamamoto graduated from medical school in 1988, 38 years ago.
What insurance does Dr. Thomas Rey Yamamoto accept?
Dr. Yamamoto is in network with 13 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. Medicare plans come from the most carriers, 9. Check the plan with the practice before a visit.
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