Dr. Michael Tieu Loi, DO
- Part D claims, 2024
- 166
- Hospital affiliations
- 1
- Industry payments
- $722
- Medical groups
- 3
- Insurance carriers
- 5
- Practice address
- 27700 Medical Center Rd, Mission Viejo, CA 92691
- Practice phone
- Call (949) 365-2447
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Mission Hospital - Unit
Acute Care Hospital-Unit · Mission Viejo, California
Find Dr. Loi'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. Michael Tieu Loi is an internist in Mission Viejo, California
Dr. Loi practices at Mission Hospital - Unit in Mission Viejo, California.
Dr. Loi's NPI, 1861057556, was assigned on May 8, 2019. Dr. Loi graduated from Arizona School of Dentistry and Oral Health - Mesa in 2021. Dr. Loi holds California license 20A22634.
- NPI
- 1861057556NPI Registry (opens in a new tab)
- NPI enumeration date
- May 8, 2019
- NPI status
- Active
- Practice phone
- (949) 365-2447
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 31
- Medical school graduation
- 2021
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Michael Tieu Loi practices at Mission Hospital - Unit in Mission Viejo, California
Dr. Loi's primary practice is Mission Hospital - Unit, at 27700 Medical Center Rd, Mission Viejo, CA 92691 in Orange County. The practice phone is (949) 365-2447.
- Mission Hospital - Unit27700 Medical Center Rd, Mission Viejo, CA 92691 · Orange CountyPhone(949) 365-2447
Source: Dmand AI Affiliation Data
Dr. Michael Tieu Loi is affiliated with 3 sites of care and 3 medical groups
Dr. Loi's primary practice is Mission Hospital - Unit in Mission Viejo, California. The medical group on file is OptumCare Medical Group. Dmand AI also links Dr. Loi to 2 more group practices and clinics and 2 medical groups, each named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Michael Tieu Loi's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Loi practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Mission Hospital - Unit | Available with a free account |
| +2 more sites and 2 medical groups | 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 each health system and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Michael Tieu Loi is one of 16,751 internists in California
Internal medicine is Dr. Loi's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Loi is board certified in internal medicine by the American Board of Internal Medicine. Dr. Loi is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Internists near Dr. Loi
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. Michael Tieu Loi's patients have a median age of 78
Across all payers, Dmand AI patient panel data puts Dr. Loi's median patient age at 78, with 54% women.
Dr. Loi's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 78
Patient panel by sex, all payers
- Women54%
- Men46%
Source: Dmand AI Patient Panel Data
Dr. Michael Tieu Loi wrote 166 Medicare Part D claims in 2024
In 2024, Dr. Loi wrote 166 Medicare Part D claims for 52 patients. 87% of them were for generic drugs.
Dr. Loi's Part D claims by kind of drug, 2024
- Generic145 claims87%
- Brand-name21 claims13%
Drug classes CMS tracks in Dr. Loi's Part D claims, 2024
- Antibiotics7%11 of 166 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. Michael Tieu Loi received $722 in industry payments from 2023 to 2024
CMS Open Payments shows 11 general payments to Dr. Loi from 6 drug and device companies from 2023 to 2024. Food and beverage make up the largest share, 100% of the total. Janssen Pharmaceuticals, Inc paid the most, $282.
General payments to Dr. Loi by program year, 2023 to 2024
Companies that paid Dr. Loi the most, 2023 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Michael Tieu Loi graduated from Arizona School of Dentistry and Oral Health - Mesa
Dr. Loi graduated from Arizona School of Dentistry and Oral Health - Mesa in 2021.
- Medical school
- Board certified in internal medicine
- Board certified in 2024 - 2026
Source: Dmand AI Professional Profile Data
Dr. Michael Tieu Loi accepts plans from 5 insurance carriers
Dr. Loi is in network with 5 carriers, including Blue Cross Blue Shield of Massachusetts, Blue Cross Blue Shield of Michigan and HCSC. Medicare plans come from the most carriers, 5. Check the plan with the practice before a visit.
- Blue Cross Blue Shield of Massachusetts
- Blue Cross Blue Shield of Michigan
- HCSC
- Regence Health Plans
- CMS Medicare
Plan types Dr. Loi accepts, by number of carriers
- Medicare5
- PPO4
Source: Dmand AI Insurance Network Data
Sources for Dr. Michael Tieu Loi'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 Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider (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. Michael Tieu Loi
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. Michael Tieu Loi's NPI number?
Dr. Michael Tieu Loi's NPI number is 1861057556. It was assigned on May 8, 2019, and it is active in the NPI Registry.
What kind of doctor is Dr. Michael Tieu Loi?
Dr. Michael Tieu Loi is an internist in Mission Viejo, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Michael Tieu Loi practice?
Dr. Loi practices at 27700 Medical Center Rd, Mission Viejo, CA 92691. Dr. Loi's primary practice is Mission Hospital - Unit in Mission Viejo, California. Dmand AI also links Dr. Loi to 2 group practices and clinics and 2 medical groups.
What is Dr. Michael Tieu Loi's office phone number?
The practice phone on file for Dr. Loi is (949) 365-2447.
What is Dr. Michael Tieu Loi's medical license number?
Dr. Loi holds California license 20A22634.
What medical group is Dr. Michael Tieu Loi part of?
Dr. Loi is linked to OptumCare Medical Group. Dmand AI links Dr. Loi to 2 more medical groups.
Is Dr. Michael Tieu Loi board certified?
Yes. Dr. Loi is board certified in internal medicine by the American Board of Internal Medicine.
Where did Dr. Michael Tieu Loi go to medical school?
Dr. Loi graduated from Arizona School of Dentistry and Oral Health - Mesa in 2021.
Has Dr. Michael Tieu Loi received payments from drug or device companies?
CMS Open Payments shows $722 in general payments to Dr. Loi from 6 companies from 2023 to 2024. The largest total came from Janssen Pharmaceuticals, Inc.
How long has Dr. Michael Tieu Loi been practicing?
Dr. Loi graduated from medical school in 2021, 5 years ago.
What insurance does Dr. Michael Tieu Loi accept?
Dr. Loi is in network with 5 carriers, including Blue Cross Blue Shield of Massachusetts, Blue Cross Blue Shield of Michigan and HCSC. Medicare plans come from the most carriers, 5. Check the plan with the practice before a visit.
Selling to internal medicine practices?
See internists in California by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card