Dr. Michael Chai, MD
- Medicare services, 2024
- 2,037
- Medicare patients, 2024
- 337
- Part D claims, 2024
- 8,231
- Publications
- 1
- Hospital affiliations
- 3
- Practice address
- 1113 Alta Av, Upland, CA 91786
- Practice phone
- Call (909) 920-6672
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Michael Chai MD Inc
Physician office · Upland, California
Find Dr. Chai'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 Chai is an internist in Upland, California
Dr. Chai practices at Michael Chai MD Inc in Upland, California.
Dr. Chai's NPI, 1083748727, was assigned on March 15, 2007. Dr. Chai graduated from Macon & Joan Brock Virginia Health Sciences Eastern Virginia Medical School in 1993. Dr. Chai holds California license G79965.
- NPI
- 1083748727NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2365540408
- NPI enumeration date
- March 15, 2007
- NPI status
- Active
- Offers telehealth
- Yes
- Practice phone
- (909) 920-6672
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 58
- Medical school graduation
- 1993
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Michael Chai practices at Michael Chai MD Inc in Upland, California
Dr. Chai's primary practice is Michael Chai MD Inc, at 1113 Alta Av, Upland, CA 91786. The practice phone is (909) 920-6672.
- Michael Chai MD Inc1113 Alta Av, Upland, CA 91786Phone(909) 920-6672
Source: Dmand AI Affiliation Data
Dr. Michael Chai is affiliated with 7 sites of care and 1 medical group
Dr. Chai's primary practice is Michael Chai MD Inc in Upland, California. Dr. Chai is also affiliated with San Antonio Regional Hospital. The medical group on file is San Antonio Regional Hospital. Dmand AI also links Dr. Chai to 2 more hospitals and 3 home health agencies, each named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Michael Chai's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chai practices, 7 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Michael Chai MD Inc | Available with a free account |
| +6 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Michael Chai is one of 16,751 internists in California
Internal medicine is Dr. Chai's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Chai is board certified in internal medicine by the American Board of Internal Medicine. Dr. Chai is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Clinical focus
Dmand AI lists acid reflux, acute gallbladder or bile duct inflammation, acute gastroduodenitis, acute kidney failure, acute mini-stroke (TIA), acute sinusitis, acute skin infection and aneurysm among the conditions Dr. Chai treats.
Internists near Dr. Chai
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 Chai billed Medicare for 2,037 services in 2024
CMS data shows 2,037 Medicare services from Dr. Chai across 16 procedure codes in 2024, for 337 Medicare patients. Medicare paid $149,576 for them. Every service was in an office.
Dr. Chai's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1,5552024: 1,4129%
- Other services
- 2023: 3992024: 32519%
- Tests and treatments
- 2023: 2622024: 2514%
- Drugs given in the office
- 2023: 1032024: 2774%
- Surgery
- 2023: 482024: 2254%
Dr. Chai compared with the California median for internists, 2024
- Dr. Chai
- California median
- Medicare services
- 2,037vs 3615.6 times
- Medicare patients
- 337vs 1512.2 times
- Part D claims
- 7,441vs 42117.7 times
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Chai's most billed Medicare procedure codes, 2024
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. Chai?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Chai and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Michael Chai treated 337 Medicare patients in 2024, average age 77
CMS counts 337 Medicare patients who saw Dr. Chai in 2024. The largest group is 75 to 84, with 134 patients. 75% of them have high blood pressure, and 75% have high cholesterol. Their average risk score is 1.14, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Chai's median patient age at 69, with 55% women.
Dr. Chai's Medicare patients by age, 2024
Dr. Chai's Medicare patients by sex, 2024
- Women18154%
- Men15646%
Chronic conditions among Dr. Chai's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis52%
- Diabetes43%
- Ischemic heart disease29%
- Cancer20%
- Atrial fibrillation19%
- Chronic kidney disease19%
Share of Medicare patients with each condition. A patient can have several.
Dr. Chai's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 69
Patient panel by sex, all payers
- Women55%
- Men44%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Michael Chai wrote 8,231 Medicare Part D claims in 2024
In 2024, Dr. Chai wrote 8,231 Medicare Part D claims for 362 patients. 86% of them were for generic drugs. CMS names the drug for 7,441 of them, across 144 drugs with 11 or more claims each, at $719,557 in total drug cost. In 2023, CMS named 7,270 claims across 142 drugs.
Dr. Chai's Part D claims by kind of drug, 2024
- Generic7,077 claims86%
- Brand-name1,108 claims13%
- Other46 claims1%
Dr. Chai'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. Chai's Part D claims, 2024
- Opioids2%139 of 8,231 claims
- Antibiotics6%481 of 8,231 claims
- Antipsychotics, patients 65 and over1%95 of 8,231 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: 7,2702024: 7,4412%
Drugs named by CMS: 144 in 2024, 142 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
Dr. Michael Chai offers telehealth to Medicare patients
CMS lists Dr. Chai as offering telehealth.
- Offers telehealth
- Yes
Removal of skin lesions: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Michael Chai has 1 publication on record
Dmand AI links 1 paper to Dr. Chai. Dr. Chai's most frequent co-author is Michael Ke Chai, MD.
Dr. Chai's most frequent co-authors
- Michael Ke Chai, MD1 shared paper
Recent publications by Dr. Chai
See who Dr. Chai researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Chai 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. Michael Chai received $5,511 in industry payments from 2016 to 2025
CMS Open Payments shows 224 general payments to Dr. Chai from 42 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 99% of the total. Eli Lilly and Company paid the most, $723. It also lists 1 research payment totaling $125 in 2019.
General payments to Dr. Chai by program year, 2016 to 2025
General payments to Dr. Chai by kind, 2016 to 2025
- Food and beverage$5,47999%
- Education$321%
Companies that paid Dr. Chai 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. Michael Chai has 2 awards and honors on record
Dmand AI lists 2 awards for Dr. Chai.
Awards and honors for Dr. Chai
- Undated
- Best Doctor
- Checkbook Top Doc
Source: Dmand AI Professional Profile Data
Dr. Michael Chai graduated from Macon & Joan Brock Virginia Health Sciences Eastern Virginia Medical School
Dr. Chai graduated from Macon & Joan Brock Virginia Health Sciences Eastern Virginia Medical School in 1993. Dr. Chai is a member of ACP.
- Medical school
- Board certified in internal medicine
- Board certified in member
- Board certified in member
Source: Dmand AI Professional Profile Data
Dr. Michael Chai accepts plans from 6 insurance carriers
Dr. Chai is in network with 6 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 5. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Michigan
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Regence Health Plans
- CMS Medicare
Plan types Dr. Chai accepts, by number of carriers
- Medicare5
- PPO5
- HMO2
- POS2
- EPO1
Source: Dmand AI Insurance Network Data
Sources for Dr. Michael Chai'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 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)Doctors and Clinicians Utilization Data (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. Michael Chai
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 Chai's NPI number?
Dr. Michael Chai's NPI number is 1083748727. It was assigned on March 15, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Michael Chai?
Dr. Michael Chai is an internist in Upland, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Michael Chai practice?
Dr. Chai practices at 1113 Alta Av, Upland, CA 91786. Dr. Chai's primary practice is Michael Chai MD Inc in Upland, California. Dmand AI also links Dr. Chai to 2 hospitals and 3 home health agencies.
What is Dr. Michael Chai's office phone number?
The practice phone on file for Dr. Chai is (909) 920-6672.
What is Dr. Michael Chai's medical license number?
Dr. Chai holds California license G79965.
Which hospitals is Dr. Michael Chai affiliated with?
Dr. Chai is affiliated with San Antonio Regional Hospital. Dmand AI links Dr. Chai to 2 more hospitals.
What medical group is Dr. Michael Chai part of?
Dr. Chai is linked to San Antonio Regional Hospital.
Does Dr. Michael Chai accept Medicare?
Yes. CMS data shows Dr. Chai billed Medicare for 2,037 services in 2024.
Does Dr. Michael Chai offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Chai as offering telehealth services.
How many Medicare patients does Dr. Michael Chai see?
CMS counts 337 Medicare patients who saw Dr. Chai in 2024, with an average age of 77.
Show 9 more questionsShow fewer questions
Is Dr. Michael Chai board certified?
Yes. Dr. Chai is board certified in internal medicine by the American Board of Internal Medicine.
What services does Dr. Michael Chai bill to Medicare?
In 2024, Dr. Chai's most billed Medicare services were office visit, established patient (99214), office visit, established patient (99213) and infusion or chemotherapy administration (96372).
Where did Dr. Michael Chai go to medical school?
Dr. Chai graduated from Macon & Joan Brock Virginia Health Sciences Eastern Virginia Medical School in 1993.
What drugs does Dr. Michael Chai prescribe most?
In 2024 Medicare Part D data, Dr. Chai's most prescribed drugs by claims were Atorvastatin Calcium, Rosuvastatin Calcium and Amlodipine Besylate.
Has Dr. Michael Chai received payments from drug or device companies?
CMS Open Payments shows $5,511 in general payments to Dr. Chai from 42 companies from 2016 to 2025. The largest total came from Eli Lilly and Company.
How long has Dr. Michael Chai been practicing?
Dr. Chai graduated from medical school in 1993, 33 years ago.
Does Dr. Michael Chai do research?
Dmand AI links 1 publication to Dr. Chai.
Who does Dr. Michael Chai publish with?
Dr. Chai's most frequent co-authors are Michael Ke Chai, MD (1 shared paper).
What insurance does Dr. Michael Chai accept?
Dr. Chai is in network with 6 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 5. Check the plan with the practice before a visit.
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