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Dr. Thiri T. Oo, MD
NPI1619256617
- Medicare services, 2019
- 77
- Part D claims, 2024
- 6,969
- Publications
- 1
- Hospital affiliations
- 1
- Industry payments
- $1,443
- Practice address
- 9961 Sierra Ave, Fontana, CA 92335
- Practice phone
- Call (909) 427-3910
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Fontana Medical Center
Fontana, California
Find Dr. Oo's professional email, personal email and mobile number
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Dr. Thiri T. Oo is an internist in Fontana, California
Dr. Oo practices at Fontana Medical Center in Fontana, California.
Dr. Oo's NPI, 1619256617, was assigned on August 8, 2011. Dr. Oo graduated from St. George's University School of Medicine in 2009. Dr. Oo holds California license A117718.
NPI and contact details
- NPI
- 1619256617NPI Registry (opens in a new tab)
- NPI enumeration date
- August 8, 2011
- NPI status
- Active
- Practice phone
- (909) 427-3910
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 43
- Medical school graduation
- 2009
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Dr. Thiri T. Oo practices at Fontana Medical Center in Fontana, California
Dr. Oo's primary practice is Fontana Medical Center, at 9961 Sierra Ave, Fontana, CA 92335 in San Bernardino County. The practice phone is (909) 427-3910.
- Fontana Medical Center9961 Sierra Ave, Fontana, CA 92335 · San Bernardino CountyPhone(909) 427-3910
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Thiri T. Oo is affiliated with 3 sites of care and 2 medical groups
Dr. Oo's primary practice is Fontana Medical Center in Fontana, California. Dr. Oo is also affiliated with Kaiser Permanente Baldwin Park Medical Center. The medical group on file is Southern California Permanente Medical Group. Dmand AI also links Dr. Oo to 1 more group practice or clinic and 1 medical group, each named with a free account.
Fontana Medical CenterPrimary
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Thiri T. Oo's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Oo practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Fontana Medical Center | 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. Thiri T. Oo is one of 16,751 internists in California
Internal medicine is Dr. Oo's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Oo is board certified in internal medicine by the American Board of Internal Medicine. Dr. Oo is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Internists near Dr. Oo
Counts of internists 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. Thiri T. Oo billed Medicare for 77 services in 2019
CMS data shows 77 Medicare services from Dr. Oo across 3 procedure codes in 2019, all of them office visits. Medicare paid $7,586 for them. Every service was in an office.
Medicare services, 201977
Paid by Medicare$7,586
Procedure codes3
Dr. Oo's Medicare services by type, 2018 to 2019
- 2018
- 2019
- Office and hospital visits
- 2018: 992019: 7722%
- Tests and treatments
- 2018: 222019: 0100%
- Other services
- 2018: 612019: 0100%
- Surgery
- 2018: 472019: 0100%
Dr. Oo compared with the California median for internists, 2019
- Dr. Oo
- California median
- Medicare services
- 77vs 36179% below
- Part D claims
- 6,390vs 42115.2 times
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Oo's most billed Medicare procedure codes, 2019
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. Oo?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Oo and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Thiri T. Oo's patients have a median age of 59
Across all payers, Dmand AI patient panel data puts Dr. Oo's median patient age at 59, with 69% women.
Dr. Oo's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 59
Patient panel by sex, all payers
- Women69%
- Men31%
Source: Dmand AI Patient Panel Data
Dr. Thiri T. Oo wrote 6,969 Medicare Part D claims in 2024
In 2024, Dr. Oo wrote 6,969 Medicare Part D claims for 612 patients. 92% of them were for generic drugs. CMS names the drug for 6,390 of them, across 114 drugs with 11 or more claims each, at $234,899 in total drug cost. In 2023, CMS named 5,771 claims across 103 drugs.
Part D claims, 20246,969
Drugs named by CMS114
Total drug cost$234,899
Part D patients612
Dr. Oo's Part D claims by kind of drug, 2024
- Generic6,392 claims92%
- Brand-name519 claims7%
- Other58 claims1%
Dr. Oo'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. Oo's Part D claims, 2024
- Opioids5%354 of 6,969 claims
- Antibiotics3%183 of 6,969 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: 5,7712024: 6,39011%
Drugs named by CMS: 114 in 2024, 103 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
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Dr. Thiri T. Oo has 1 publication on record
Dmand AI links 1 paper to Dr. Oo in 2013. Dr. Oo's most frequent co-authors are Michael Edward Aldridge, MD, Khuyen Quang Do, MD and Tasneem Zehra Naqvi, MD.
Papers1
Dr. Oo's most frequent co-authors
- Michael Edward Aldridge, MD1 shared paper
- Khuyen Quang Do, MD1 shared paper
- Tasneem Zehra Naqvi, MD1 shared paper
Recent publications by Dr. Oo
See who Dr. Oo researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Oo works with, so you can find a warm path to the right internists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Thiri T. Oo received $1,443 in industry payments from 2016 to 2018
CMS Open Payments shows 88 general payments to Dr. Oo from 18 drug and device companies from 2016 to 2018. Food and beverage make up the largest share, 100% of the total. Eli Lilly and Company paid the most, $251.
General payments to Dr. Oo by program year, 2016 to 2018
Companies that paid Dr. Oo the most, 2016 to 2018
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Thiri T. Oo has 2 awards and honors on record
Dmand AI lists 2 awards for Dr. Oo, most recently Fellowship of American Colleges of Physician in 2024.
Awards and honors for Dr. Oo
- 2024
- Fellowship of American Colleges of Physician
- 2013
- CMS Stage 1 EHR
Source: Dmand AI Professional Profile Data
Dr. Thiri T. Oo graduated from St. George's University School of Medicine
Dr. Oo graduated from St. George's University School of Medicine in 2009. Dr. Oo is a member of ACP and AMA.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Thiri T. Oo accepts plans from 2 insurance carriers
Dr. Oo is in network with 2 carriers, including Elevance and Kaiser Permanente. EPO plans come from the most carriers, 2. Check the plan with the practice before a visit.
- Elevance
- Kaiser Permanente
Plan types Dr. Oo accepts, by number of carriers
- EPO2
- HMO2
- POS2
- Medicare1
- PPO1
Source: Dmand AI Insurance Network Data
Sources for Dr. Thiri T. Oo'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 Data |
| 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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| 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. Thiri T. Oo
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. Thiri T. Oo's NPI number?
Dr. Thiri T. Oo's NPI number is 1619256617. It was assigned on August 8, 2011, and it is active in the NPI Registry.
What kind of doctor is Dr. Thiri T. Oo?
Dr. Thiri T. Oo is an internist in Fontana, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Thiri T. Oo practice?
Dr. Oo practices at 9961 Sierra Ave, Fontana, CA 92335. Dr. Oo's primary practice is Fontana Medical Center in Fontana, California. Dmand AI also links Dr. Oo to 1 group practice or clinic and 1 medical group.
What is Dr. Thiri T. Oo's office phone number?
The practice phone on file for Dr. Oo is (909) 427-3910.
What is Dr. Thiri T. Oo's medical license number?
Dr. Oo holds California license A117718.
Which hospitals is Dr. Thiri T. Oo affiliated with?
Dr. Oo is affiliated with Kaiser Permanente Baldwin Park Medical Center.
What medical group is Dr. Thiri T. Oo part of?
Dr. Oo is linked to Southern California Permanente Medical Group. Dmand AI links Dr. Oo to 1 more medical group.
Does Dr. Thiri T. Oo accept Medicare?
Yes. CMS data shows Dr. Oo billed Medicare for 77 services in 2019.
Is Dr. Thiri T. Oo board certified?
Yes. Dr. Oo is board certified in internal medicine by the American Board of Internal Medicine.
What services does Dr. Thiri T. Oo bill to Medicare?
In 2019, Dr. Oo's most billed Medicare services were office visit, established patient (99214), office visit, established patient (99213) and office visit, new patient (99205).
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Where did Dr. Thiri T. Oo go to medical school?
Dr. Oo graduated from St. George's University School of Medicine in 2009.
What drugs does Dr. Thiri T. Oo prescribe most?
In 2024 Medicare Part D data, Dr. Oo's most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Losartan Potassium.
Has Dr. Thiri T. Oo received payments from drug or device companies?
CMS Open Payments shows $1,443 in general payments to Dr. Oo from 18 companies from 2016 to 2018. The largest total came from Eli Lilly and Company.
How long has Dr. Thiri T. Oo been practicing?
Dr. Oo graduated from medical school in 2009, 17 years ago.
Does Dr. Thiri T. Oo do research?
Dmand AI links 1 publication to Dr. Oo.
Who does Dr. Thiri T. Oo publish with?
Dr. Oo's most frequent co-authors are Michael Edward Aldridge, MD (1 shared paper), Khuyen Quang Do, MD (1 shared paper) and Tasneem Zehra Naqvi, MD (1 shared paper).
What insurance does Dr. Thiri T. Oo accept?
Dr. Oo is in network with 2 carriers, including Elevance and Kaiser Permanente. EPO plans come from the most carriers, 2. Check the plan with the practice before a visit.
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