Dr. G. Thomas Ruiz, MD
- Medicare services, 2022
- 14
- Medicare patients, 2024
- 19
- Part D claims, 2024
- 125
- Industry payments
- $5,364
- Affiliated sites
- 2
- Practice address
- 18035 Brookhurst St, Fountain Valley, CA 92708
- Practice phone
- Call (877) 696-3622
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Memorialcare Medical Foundation
Fountain Valley, California
Find Dr. Ruiz'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. G. Thomas Ruiz is an OB-GYN in Fountain Valley, California
Dr. Ruiz practices at Memorialcare Medical Foundation in Fountain Valley, California.
Dr. Ruiz's NPI, 1518967330, was assigned on July 22, 2005. Dr. Ruiz graduated from UC Irvine School of Medicine in 1989. Dr. Ruiz holds California license G69184.
- NPI
- 1518967330NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0446354690
- NPI enumeration date
- July 22, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (877) 696-3622
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 63
- Medical school graduation
- 1989
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. G. Thomas Ruiz practices at Memorialcare Medical Foundation in Fountain Valley, California
Dr. Ruiz's primary practice is Memorialcare Medical Foundation, at 18035 Brookhurst St, Fountain Valley, CA 92708 in Orange County. The practice phone is (877) 696-3622.
- Memorialcare Medical Foundation18035 Brookhurst St, Fountain Valley, CA 92708 · Orange CountyPhone(877) 696-3622
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. G. Thomas Ruiz is affiliated with 3 sites of care and 2 medical groups
Dr. Ruiz's primary practice is Memorialcare Medical Foundation in Fountain Valley, California. The medical group on file is Optum - Downtown Los Angeles. Dmand AI also links Dr. Ruiz to 2 more group practices and clinics and 1 medical group, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. G. Thomas Ruiz's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Ruiz practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Memorialcare Medical Foundation | Available with a free account |
| +2 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. G. Thomas Ruiz is one of 4,642 OB-GYNs in California
Obstetrics and gynecology is Dr. Ruiz's primary specialty in the NPI Registry, under taxonomy code 207V00000X. Dr. Ruiz is board certified in obstetrics & gynecology by the American Board of Obstetrics and Gynecology. Dmand AI has Dr. Ruiz's licenses on file in 2 states: California and Nevada.
Specialties and state licenses
- Obstetrics and gynecology, CaliforniaPrimary
- Nevada license
Clinical focus
Dmand AI lists menopause among the conditions Dr. Ruiz treats.
OB-GYNs near Dr. Ruiz
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. G. Thomas Ruiz billed Medicare for 14 services in 2022
CMS data shows 14 Medicare services from Dr. Ruiz across 1 procedure code in 2022, all of them office visits, for 19 Medicare patients. Medicare paid $1,055 for them. Every service was in an office.
Dr. Ruiz compared with the California median for OB-GYNs, 2022
- Dr. Ruiz
- California median
- Medicare services
- 14vs 5876% below
- Medicare patients
- 19vs 5263% below
- Part D claims
- 66vs 3589% above
Medians across 3,823 OB-GYNs in California with Dmand AI profiles that report each measure.
Dr. Ruiz'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. Ruiz?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Ruiz and other OB-GYNs in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. G. Thomas Ruiz treated 19 Medicare patients in 2024, average age 71
CMS counts 19 Medicare patients who saw Dr. Ruiz in 2024. 75% of them have high blood pressure, and 75% have high cholesterol. Their average risk score is 1.37, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Ruiz's median patient age at 37, with 98% women.
Chronic conditions among Dr. Ruiz's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis74%
Share of Medicare patients with each condition. A patient can have several.
Dr. Ruiz's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 37
Patient panel by sex, all payers
- Women98%
- Men1%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. G. Thomas Ruiz wrote 125 Medicare Part D claims in 2024
In 2024, Dr. Ruiz wrote 125 Medicare Part D claims for 39 patients. 69% of them were for generic drugs. CMS names the drug for 66 of them, across 4 drugs with 11 or more claims each, at $5,334 in total drug cost. In 2023, CMS named 42 claims across 3 drugs.
Dr. Ruiz's Part D claims by kind of drug, 2024
- Generic86 claims69%
- Brand-name39 claims31%
Dr. Ruiz'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.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 422024: 6657%
Drugs named by CMS: 4 in 2024, 3 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. G. Thomas Ruiz takes part in Medicare
Dr. Ruiz 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. G. Thomas Ruiz received $5,364 in industry payments from 2016 to 2025
CMS Open Payments shows 54 general payments to Dr. Ruiz from 16 drug and device companies from 2016 to 2025. Speaker and faculty fees make up the largest share, 56% of the total. Merck Sharp & Dohme Corporation paid the most, $3,160.
General payments to Dr. Ruiz by program year, 2016 to 2025
General payments to Dr. Ruiz by kind, 2016 to 2025
- Speaker and faculty fees$3,00056%
- Food and beverage$2,32943%
- Travel and lodging$180%
- Education$170%
Companies that paid Dr. Ruiz the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. G. Thomas Ruiz graduated from UC Irvine School of Medicine
Dr. Ruiz graduated from UC Irvine School of Medicine in 1989.
- Medical school
- Board certified in obstetrics & gynecology
Source: Dmand AI Professional Profile Data
Dr. G. Thomas Ruiz accepts plans from 7 insurance carriers
Dr. Ruiz is in network with 7 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Humana. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Michigan
- Humana
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Regence Health Plans
- CMS Medicare
Plan types Dr. Ruiz accepts, by number of carriers
- Medicare7
- PPO6
- HMO3
- POS2
- EPO1
Source: Dmand AI Insurance Network Data
Sources for Dr. G. Thomas Ruiz'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 Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation 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. G. Thomas Ruiz
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. G. Thomas Ruiz's NPI number?
Dr. G. Thomas Ruiz's NPI number is 1518967330. It was assigned on July 22, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. G. Thomas Ruiz?
Dr. G. Thomas Ruiz is an OB-GYN in Fountain Valley, California. The primary specialty in the NPI Registry is Obstetrics & Gynecology Physician (taxonomy code 207V00000X).
Where does Dr. G. Thomas Ruiz practice?
Dr. Ruiz practices at 18035 Brookhurst St, Fountain Valley, CA 92708. Dr. Ruiz's primary practice is Memorialcare Medical Foundation in Fountain Valley, California. Dmand AI also links Dr. Ruiz to 2 group practices and clinics and 1 medical group.
What is Dr. G. Thomas Ruiz's office phone number?
The practice phone on file for Dr. Ruiz is (877) 696-3622.
What is Dr. G. Thomas Ruiz's medical license number?
Dr. Ruiz holds California license G69184, one of the licenses on file in 2 states.
Which states has Dr. G. Thomas Ruiz been licensed in?
Dmand AI has state licenses on file for Dr. Ruiz in California (1990 to 2026) and Nevada.
What medical group is Dr. G. Thomas Ruiz part of?
Dr. Ruiz is linked to Optum - Downtown Los Angeles. Dmand AI links Dr. Ruiz to 1 more medical group.
Does Dr. G. Thomas Ruiz accept Medicare?
Yes. CMS data shows Dr. Ruiz billed Medicare for 14 services in 2022, and Dr. Ruiz accepts Medicare assignment.
How many Medicare patients does Dr. G. Thomas Ruiz see?
CMS counts 19 Medicare patients who saw Dr. Ruiz in 2024, with an average age of 71.
Is Dr. G. Thomas Ruiz board certified?
Yes. Dr. Ruiz is board certified in obstetrics & gynecology by the American Board of Obstetrics and Gynecology.
Show 6 more questionsShow fewer questions
What services does Dr. G. Thomas Ruiz bill to Medicare?
In 2022, Dr. Ruiz's most billed Medicare services were office visit, established patient (99213).
Where did Dr. G. Thomas Ruiz go to medical school?
Dr. Ruiz graduated from UC Irvine School of Medicine in 1989.
What drugs does Dr. G. Thomas Ruiz prescribe most?
In 2024 Medicare Part D data, Dr. Ruiz's most prescribed drugs by claims were Estradiol, Estradiol (Once Weekly) and Norethindrone Acetate.
Has Dr. G. Thomas Ruiz received payments from drug or device companies?
CMS Open Payments shows $5,364 in general payments to Dr. Ruiz from 16 companies from 2016 to 2025. The largest total came from Merck Sharp & Dohme Corporation.
How long has Dr. G. Thomas Ruiz been practicing?
Dr. Ruiz graduated from medical school in 1989, 37 years ago.
What insurance does Dr. G. Thomas Ruiz accept?
Dr. Ruiz is in network with 7 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Humana. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.
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