Dr. Keith Chunyen Hsu, MD
- Medicare services, 2024
- 995
- Medicare patients, 2024
- 284
- Part D claims, 2024
- 418
- Hospital affiliations
- 2
- Industry payments
- $677
- 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. Hsu's professional email, personal email and mobile number
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Dr. Keith Chunyen Hsu is a hospitalist in Mission Viejo, California
Dr. Hsu practices at Mission Hospital - Unit in Mission Viejo, California.
Dr. Hsu's NPI, 1891921458, was assigned on June 9, 2009. Dr. Hsu graduated from Cleveland Medical College, Homeopathic in 2008. Dr. Hsu holds California license A110787C.
- NPI
- 1891921458NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7012189210
- NPI enumeration date
- June 9, 2009
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (949) 365-2447
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 44
- Medical school graduation
- 2008
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Keith Chunyen Hsu practices at Mission Hospital - Unit in Mission Viejo, California
Dr. Hsu'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. Keith Chunyen Hsu is affiliated with 4 sites of care and 2 medical groups
Dr. Hsu's primary practice is Mission Hospital - Unit in Mission Viejo, California. Dr. Hsu is also affiliated with Providence Mission Hospital. The medical group on file is St. Jude Heritage Medical Group. Dmand AI also links Dr. Hsu to 2 more group practices and clinics and 1 medical group, each named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Keith Chunyen Hsu's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Hsu practices, 4 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 |
| +3 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Keith Chunyen Hsu is one of 3,186 hospitalists in California
Hospitalist is Dr. Hsu's primary specialty in the NPI Registry, under taxonomy code 208M00000X. Dr. Hsu is board certified in internal medicine by the American Board of Internal Medicine. Dr. Hsu is licensed in California.
Specialties and state licenses
- Hospitalist, CaliforniaPrimary
Clinical focus
Dmand AI lists bile duct problems, cellulitis, circulation problems, congestive heart failure, gastrointestinal bleeding, gastrointestinal inflammation, heart attack and kidney failure among the conditions Dr. Hsu treats.
Hospitalists near Dr. Hsu
Counts of hospitalists 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. Keith Chunyen Hsu billed Medicare for 995 services in 2024
CMS data shows 995 Medicare services from Dr. Hsu across 5 procedure codes in 2024, for 284 Medicare patients. Medicare paid $53,754 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Hsu's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 7332024: 99536%
Dr. Hsu compared with the California median for hospitalists, 2024
- Dr. Hsu
- California median
- Medicare services
- 995vs 4302.3 times
- Medicare patients
- 284vs 20141% above
- Part D claims
- 179vs 692.6 times
Medians across 2,991 hospitalists in California with Dmand AI profiles that report each measure.
Dr. Hsu'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.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Hsu and other hospitalists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Keith Chunyen Hsu treated 284 Medicare patients in 2024, average age 79
CMS counts 284 Medicare patients who saw Dr. Hsu in 2024. The largest group is 75 to 84, with 119 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 16% are also on Medicaid. Their average risk score is 2.25, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Hsu's median patient age at 76, with 51% women.
Dr. Hsu's Medicare patients by age, 2024
Dr. Hsu's Medicare patients by sex, 2024
- Women15956%
- Men12544%
Chronic conditions among Dr. Hsu's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis59%
- Atrial fibrillation43%
- Ischemic heart disease43%
- Chronic kidney disease39%
- Heart failure37%
- Mood disorders36%
Share of Medicare patients with each condition. A patient can have several.
Dr. Hsu's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 76
Patient panel by sex, all payers
- Women51%
- Men48%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Keith Chunyen Hsu wrote 418 Medicare Part D claims in 2024
In 2024, Dr. Hsu wrote 418 Medicare Part D claims for 157 patients. 85% of them were for generic drugs. CMS names the drug for 179 of them, across 12 drugs with 11 or more claims each, at $7,373 in total drug cost. In 2023, CMS named 11 claims across 1 drug.
Dr. Hsu's Part D claims by kind of drug, 2024
- Generic357 claims85%
- Brand-name61 claims15%
Dr. Hsu'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. Hsu's Part D claims, 2024
- Opioids5%21 of 418 claims
- Antibiotics18%77 of 418 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: 112024: 1791527%
Drugs named by CMS: 12 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. Keith Chunyen Hsu takes part in Medicare
Dr. Hsu 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. Keith Chunyen Hsu received $677 in industry payments from 2016 to 2025
CMS Open Payments shows 29 general payments to Dr. Hsu from 9 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Abbvie Inc. paid the most, $194.
General payments to Dr. Hsu by program year, 2016 to 2025
Companies that paid Dr. Hsu 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. Keith Chunyen Hsu graduated from Cleveland Medical College, Homeopathic
Dr. Hsu graduated from Cleveland Medical College, Homeopathic in 2008.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Keith Chunyen Hsu accepts plans from 14 insurance carriers
Dr. Hsu is in network with 14 carriers, including Aetna, Elevance and Excellus BlueCross BlueShield. PPO plans come from the most carriers, 10. Check the plan with the practice before a visit.
- Aetna
- Elevance
- Excellus BlueCross BlueShield
- Blue Cross Blue Shield of Michigan
- United Healthcare
- HCSC
- Blue Cross Blue Shield of Massachusetts
- Regence Health Plans
- +6 more carriersWith a free account
Plan types Dr. Hsu accepts, by number of carriers
- PPO10
- Medicare9
- HMO7
- EPO5
- POS5
Source: Dmand AI Insurance Network Data
Sources for Dr. Keith Chunyen Hsu'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) |
| 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. Keith Chunyen Hsu
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. Keith Chunyen Hsu's NPI number?
Dr. Keith Chunyen Hsu's NPI number is 1891921458. It was assigned on June 9, 2009, and it is active in the NPI Registry.
What kind of doctor is Dr. Keith Chunyen Hsu?
Dr. Keith Chunyen Hsu is a hospitalist in Mission Viejo, California. The primary specialty in the NPI Registry is Hospitalist Physician (taxonomy code 208M00000X).
Where does Dr. Keith Chunyen Hsu practice?
Dr. Hsu practices at 27700 Medical Center Rd, Mission Viejo, CA 92691. Dr. Hsu's primary practice is Mission Hospital - Unit in Mission Viejo, California. Dmand AI also links Dr. Hsu to 2 group practices and clinics and 1 medical group.
What is Dr. Keith Chunyen Hsu's office phone number?
The practice phone on file for Dr. Hsu is (949) 365-2447.
What is Dr. Keith Chunyen Hsu's medical license number?
Dr. Hsu holds California license A110787C.
Which hospitals is Dr. Keith Chunyen Hsu affiliated with?
Dr. Hsu is affiliated with Providence Mission Hospital. Dmand AI links Dr. Hsu to 1 more hospital.
What medical group is Dr. Keith Chunyen Hsu part of?
Dr. Hsu is linked to St. Jude Heritage Medical Group. Dmand AI links Dr. Hsu to 1 more medical group.
Does Dr. Keith Chunyen Hsu accept Medicare?
Yes. CMS data shows Dr. Hsu billed Medicare for 995 services in 2024, and Dr. Hsu accepts Medicare assignment.
How many Medicare patients does Dr. Keith Chunyen Hsu see?
CMS counts 284 Medicare patients who saw Dr. Hsu in 2024, with an average age of 79.
Is Dr. Keith Chunyen Hsu board certified?
Yes. Dr. Hsu is board certified in internal medicine by the American Board of Internal Medicine.
Show 6 more questionsShow fewer questions
What services does Dr. Keith Chunyen Hsu bill to Medicare?
In 2024, Dr. Hsu's most billed Medicare services were hospital inpatient care (99231), hospital inpatient care (99238) and hospital inpatient care (99222).
Where did Dr. Keith Chunyen Hsu go to medical school?
Dr. Hsu graduated from Cleveland Medical College, Homeopathic in 2008.
What drugs does Dr. Keith Chunyen Hsu prescribe most?
In 2024 Medicare Part D data, Dr. Hsu's most prescribed drugs by claims were Pantoprazole Sodium, Atorvastatin Calcium and Clopidogrel.
Has Dr. Keith Chunyen Hsu received payments from drug or device companies?
CMS Open Payments shows $677 in general payments to Dr. Hsu from 9 companies from 2016 to 2025. The largest total came from Abbvie Inc.
How long has Dr. Keith Chunyen Hsu been practicing?
Dr. Hsu graduated from medical school in 2008, 18 years ago.
What insurance does Dr. Keith Chunyen Hsu accept?
Dr. Hsu is in network with 14 carriers, including Aetna, Elevance and Excellus BlueCross BlueShield. PPO plans come from the most carriers, 10. Check the plan with the practice before a visit.
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