Dr. Irvin Chi-Yang Lien, MD
- Medicare services, 2024
- 11
- Medicare patients, 2024
- 23
- Part D claims, 2024
- 513
- Publications
- 6
- Hospital affiliations
- 1
- Practice address
- 1100 Veterans Boulevard, Redwood City, CA 94063
- Practice phone
- Call (650) 299-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Lien'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. Irvin Chi-Yang Lien is a hospitalist in Redwood City, California
Dr. Lien practices at Redwood City Medical Center in Redwood City, California, part of Kaiser Permanente.
Dr. Lien's NPI, 1124654272, was assigned on March 20, 2020. Dr. Lien graduated from Wayne State University School Of Medicine in 2020. Dr. Lien holds California license A180133.
- NPI
- 1124654272NPI Registry (opens in a new tab)
- NPI enumeration date
- March 20, 2020
- NPI status
- Active
- Practice phone
- (650) 299-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 32
- Medical school graduation
- 2020
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Irvin Chi-Yang Lien practices at Redwood City Medical Center in Redwood City, California
Dr. Lien's primary practice is Redwood City Medical Center, at 1100 Veterans Boulevard, Redwood City, CA 94063 in San Mateo County. The practice phone is (650) 299-2000.
- Redwood City Medical Center1100 Veterans Boulevard, Redwood City, CA 94063 · San Mateo CountyPhone(650) 299-2000
Source: Dmand AI Affiliation Data
Dr. Irvin Chi-Yang Lien is affiliated with 1 site of care and 1 medical group
Dr. Lien's primary practice is Redwood City Medical Center in Redwood City, California, part of Kaiser Permanente. The medical group on file is The Permanente Medical Group, Inc.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Irvin Chi-Yang Lien's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Lien practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Redwood City Medical Center | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Irvin Chi-Yang Lien is one of 3,186 hospitalists in California
Hospitalist is Dr. Lien's primary specialty in the NPI Registry, under taxonomy code 208M00000X. Dr. Lien is board certified in internal medicine by the American Board of Internal Medicine. Dr. Lien is licensed in California.
Specialties and state licenses
- Hospitalist, CaliforniaPrimary
Hospitalists near Dr. Lien
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. Irvin Chi-Yang Lien billed Medicare for 11 services in 2024
CMS data shows 11 Medicare services from Dr. Lien across 1 procedure code in 2024, for 23 Medicare patients. Medicare paid $1,262 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Lien compared with the California median for hospitalists, 2024
- Dr. Lien
- California median
- Medicare services
- 11vs 43097% below
- Medicare patients
- 23vs 20189% below
- Part D claims
- 239vs 693.5 times
Medians across 2,991 hospitalists in California with Dmand AI profiles that report each measure.
Dr. Lien'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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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Irvin Chi-Yang Lien treated 23 Medicare patients in 2024, average age 70
CMS counts 23 Medicare patients who saw Dr. Lien in 2024. 75% of them have high blood pressure, and 65% have high cholesterol. 52% are also on Medicaid. Their average risk score is 2.71, 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. Lien's median patient age at 66, with 20% women.
Dr. Lien's Medicare patients by sex, 2024
- Women1252%
- Men1148%
Chronic conditions among Dr. Lien's Medicare patients, 2024
- High blood pressure75%
- High cholesterol65%
- Anxiety48%
- Diabetes48%
Share of Medicare patients with each condition. A patient can have several.
Dr. Lien's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 66
Patient panel by sex, all payers
- Women20%
- Men80%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Irvin Chi-Yang Lien wrote 513 Medicare Part D claims in 2024
In 2024, Dr. Lien wrote 513 Medicare Part D claims for 175 patients. 88% of them were for generic drugs. CMS names the drug for 239 of them, across 11 drugs with 11 or more claims each, at $3,109 in total drug cost. In 2023, CMS named 159 claims across 7 drugs.
Dr. Lien's Part D claims by kind of drug, 2024
- Generic451 claims88%
- Brand-name and other62 claims12%
Dr. Lien'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. Lien's Part D claims, 2024
- Antibiotics22%113 of 513 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: 1592024: 23950%
Drugs named by CMS: 11 in 2024, 7 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. Irvin Chi-Yang Lien has 6 publications on record
Dmand AI links 6 papers to Dr. Lien, published from 2016 to 2024. 2022 was the busiest year, with 2. Dr. Lien has published most often in Transl Gastroenterol Hepatol. Dr. Lien's most frequent co-authors are Mona Mahd Abutouk, Miriam Beyder, MD and Alex Chan, DO.
Dr. Lien's papers by year, 2016 to 2024
Dr. Lien's most frequent co-authors
Recent publications by Dr. Lien
Transl Gastroenterol Hepatol
See who Dr. Lien researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Lien works with, so you can find a warm path to the right hospitalists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Irvin Chi-Yang Lien received $246 in industry payments in 2025
CMS Open Payments shows 6 general payments to Dr. Lien from 6 drug and device companies in 2025. Food and beverage make up the largest share, 100% of the total. Sanofi and Genzyme US Companies paid the most, $115.
Companies that paid Dr. Lien the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Irvin Chi-Yang Lien graduated from Wayne State University School Of Medicine
Dr. Lien graduated from Wayne State University School Of Medicine in 2020.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Sources for Dr. Irvin Chi-Yang Lien'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 DataDmand AI Org Hierarchy 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) |
| 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) |
| Training, board certification and memberships | Dmand AI Professional Profile 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. Irvin Chi-Yang Lien
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. Irvin Chi-Yang Lien's NPI number?
Dr. Irvin Chi-Yang Lien's NPI number is 1124654272. It was assigned on March 20, 2020, and it is active in the NPI Registry.
What kind of doctor is Dr. Irvin Chi-Yang Lien?
Dr. Irvin Chi-Yang Lien is a hospitalist in Redwood City, California. The primary specialty in the NPI Registry is Hospitalist Physician (taxonomy code 208M00000X).
Where does Dr. Irvin Chi-Yang Lien practice?
Dr. Lien practices at 1100 Veterans Boulevard, Redwood City, CA 94063. Dr. Lien's primary practice is Redwood City Medical Center in Redwood City, California, part of Kaiser Permanente.
What is Dr. Irvin Chi-Yang Lien's office phone number?
The practice phone on file for Dr. Lien is (650) 299-2000.
What is Dr. Irvin Chi-Yang Lien's medical license number?
Dr. Lien holds California license A180133.
Which hospitals is Dr. Irvin Chi-Yang Lien affiliated with?
Dr. Lien practices at Redwood City Medical Center in Redwood City, California.
What medical group is Dr. Irvin Chi-Yang Lien part of?
Dr. Lien is linked to The Permanente Medical Group, Inc.
Does Dr. Irvin Chi-Yang Lien accept Medicare?
Yes. CMS data shows Dr. Lien billed Medicare for 11 services in 2024.
How many Medicare patients does Dr. Irvin Chi-Yang Lien see?
CMS counts 23 Medicare patients who saw Dr. Lien in 2024, with an average age of 70.
Is Dr. Irvin Chi-Yang Lien board certified?
Yes. Dr. Lien is board certified in internal medicine by the American Board of Internal Medicine.
Show 7 more questionsShow fewer questions
What services does Dr. Irvin Chi-Yang Lien bill to Medicare?
In 2024, Dr. Lien's most billed Medicare services were hospital inpatient care (99222).
Where did Dr. Irvin Chi-Yang Lien go to medical school?
Dr. Lien graduated from Wayne State University School Of Medicine in 2020.
What drugs does Dr. Irvin Chi-Yang Lien prescribe most?
In 2024 Medicare Part D data, Dr. Lien's most prescribed drugs by claims were Furosemide, Atorvastatin Calcium and Cefpodoxime Proxetil.
Has Dr. Irvin Chi-Yang Lien received payments from drug or device companies?
CMS Open Payments shows $246 in general payments to Dr. Lien from 6 companies from 2025 to 2025. The largest total came from Sanofi and Genzyme US Companies.
How long has Dr. Irvin Chi-Yang Lien been practicing?
Dr. Lien graduated from medical school in 2020, 6 years ago.
Does Dr. Irvin Chi-Yang Lien do research?
Dmand AI links 6 publications to Dr. Lien, published from 2016 to 2024.
Who does Dr. Irvin Chi-Yang Lien publish with?
Dr. Lien's most frequent co-authors are Mona Mahd Abutouk (1 shared paper), Miriam Beyder, MD (1 shared paper) and Alex Chan, DO (1 shared paper).
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