Dr. David Ying Foong Chiou, MD
- Medicare services, 2024
- 2,702
- Medicare patients, 2024
- 292
- Part D claims, 2024
- 9,462
- Hospital affiliations
- 2
- Industry payments
- $8,486
- Practice address
- 1170 E Belvidere Rd, Grayslake, IL 60030
- Practice phone
- Call (847) 566-0300
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Lake County Medical Group SC
Grayslake, Illinois
Find Dr. Chiou'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. David Ying Foong Chiou is an internist in Grayslake, Illinois
Dr. Chiou practices at Lake County Medical Group SC in Grayslake, Illinois.
Dr. Chiou's NPI, 1093779084, was assigned on April 14, 2006. Dr. Chiou graduated from University of Wisconsin School of Medicine in 1996. Dr. Chiou holds Illinois license 036098964.
- NPI
- 1093779084NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0446383178
- NPI enumeration date
- April 14, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (847) 566-0300
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 56
- Medical school graduation
- 1996
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. David Ying Foong Chiou practices at Lake County Medical Group SC in Grayslake, Illinois
Dr. Chiou's primary practice is Lake County Medical Group SC, at 1170 E Belvidere Rd, Grayslake, IL 60030 in Lake County. The practice phone is (847) 566-0300.
- Lake County Medical Group SC1170 E Belvidere Rd, Grayslake, IL 60030 · Lake CountyPhone(847) 566-0300
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. David Ying Foong Chiou is affiliated with 13 sites of care and 2 medical groups
Dr. Chiou's primary practice is Lake County Medical Group SC in Grayslake, Illinois. Dr. Chiou is also affiliated with Northwestern Medicine Catherine Gratz Griffin Lake Forest Hospital. The medical group on file is Lake County Medical Group. Dmand AI also links Dr. Chiou to 1 more hospital, 4 skilled nursing facilities, 3 hospices, 2 group practices and clinics, 1 home health agency and 1 medical group, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. David Ying Foong Chiou's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chiou practices, 12 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Lake County Medical Group SC | Available with a free account |
| +12 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. David Ying Foong Chiou is one of 5,652 internists in Illinois
Internal medicine is Dr. Chiou's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Chiou is licensed in Illinois.
Specialties and state licenses
- Internal medicine, IllinoisPrimary
Internists near Dr. Chiou
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. David Ying Foong Chiou billed Medicare for 2,702 services in 2024
CMS data shows 2,702 Medicare services from Dr. Chiou across 14 procedure codes in 2024, for 292 Medicare patients. Medicare paid $252,271 for them. Every service was in an office.
Dr. Chiou's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 2,2772024: 2,284No change
- Other services
- 2023: 2062024: 25725%
- Surgery
- 2023: 1742024: 14815%
- Tests and treatments
- 2023: 162024: 1319%
- Lab and pathology
- 2023: 222024: 0100%
Dr. Chiou compared with the Illinois median for internists, 2024
- Dr. Chiou
- Illinois median
- Medicare services
- 2,702vs 5664.8 times
- Medicare patients
- 292vs 20840% above
- Part D claims
- 8,457vs 28429.8 times
Medians across 5,192 internists in Illinois with Dmand AI profiles that report each measure.
Dr. Chiou'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. Chiou?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Chiou and other internists in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. David Ying Foong Chiou treated 292 Medicare patients in 2024, average age 74
CMS counts 292 Medicare patients who saw Dr. Chiou in 2024. The largest group is 65 to 74, with 120 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 39% are also on Medicaid. Their average risk score is 1.81, 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. Chiou's median patient age at 69, with 51% women.
Dr. Chiou's Medicare patients by age, 2024
Dr. Chiou's Medicare patients by sex, 2024
- Women15653%
- Men13647%
Chronic conditions among Dr. Chiou's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis69%
- Diabetes42%
- Anxiety41%
- Mood disorders36%
- Depression33%
- Chronic kidney disease31%
Share of Medicare patients with each condition. A patient can have several.
Dr. Chiou'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
- Women51%
- Men49%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. David Ying Foong Chiou wrote 9,462 Medicare Part D claims in 2024
In 2024, Dr. Chiou wrote 9,462 Medicare Part D claims for 443 patients. 87% of them were for generic drugs. CMS names the drug for 8,457 of them, across 157 drugs with 11 or more claims each, at $472,949 in total drug cost. In 2023, CMS named 10,291 claims across 170 drugs.
Dr. Chiou's Part D claims by kind of drug, 2024
- Generic8,211 claims87%
- Brand-name1,175 claims12%
- Other76 claims1%
Dr. Chiou'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. Chiou's Part D claims, 2024
- Opioids2%187 of 9,462 claims
- Antibiotics4%384 of 9,462 claims
- Antipsychotics, patients 65 and over2%176 of 9,462 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: 10,2912024: 8,45718%
Drugs named by CMS: 157 in 2024, 170 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. David Ying Foong Chiou takes part in Medicare
Dr. Chiou 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. David Ying Foong Chiou received $8,486 in industry payments from 2016 to 2025
CMS Open Payments shows 500 general payments to Dr. Chiou from 49 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 99% of the total. Novo Nordisk Inc paid the most, $1,119.
General payments to Dr. Chiou by program year, 2016 to 2025
General payments to Dr. Chiou by kind, 2016 to 2025
- Food and beverage$8,37699%
- Education$1091%
Companies that paid Dr. Chiou 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. David Ying Foong Chiou graduated from University of Wisconsin School of Medicine
Dr. Chiou graduated from University of Wisconsin School of Medicine in 1996.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. David Ying Foong Chiou'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 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 |
| 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. David Ying Foong Chiou
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. David Ying Foong Chiou's NPI number?
Dr. David Ying Foong Chiou's NPI number is 1093779084. It was assigned on April 14, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. David Ying Foong Chiou?
Dr. David Ying Foong Chiou is an internist in Grayslake, Illinois. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. David Ying Foong Chiou practice?
Dr. Chiou practices at 1170 E Belvidere Rd, Grayslake, IL 60030. Dr. Chiou's primary practice is Lake County Medical Group SC in Grayslake, Illinois. Dmand AI also links Dr. Chiou to 1 hospital, 4 skilled nursing facilities, 3 hospices, 2 group practices and clinics, 1 home health agency and 1 medical group.
What is Dr. David Ying Foong Chiou's office phone number?
The practice phone on file for Dr. Chiou is (847) 566-0300.
What is Dr. David Ying Foong Chiou's medical license number?
Dr. Chiou holds Illinois license 036098964.
Which hospitals is Dr. David Ying Foong Chiou affiliated with?
Dr. Chiou is affiliated with Northwestern Medicine Catherine Gratz Griffin Lake Forest Hospital. Dmand AI links Dr. Chiou to 1 more hospital.
What medical group is Dr. David Ying Foong Chiou part of?
Dr. Chiou is linked to Lake County Medical Group. Dmand AI links Dr. Chiou to 1 more medical group.
Does Dr. David Ying Foong Chiou accept Medicare?
Yes. CMS data shows Dr. Chiou billed Medicare for 2,702 services in 2024, and Dr. Chiou accepts Medicare assignment.
How many Medicare patients does Dr. David Ying Foong Chiou see?
CMS counts 292 Medicare patients who saw Dr. Chiou in 2024, with an average age of 74.
What services does Dr. David Ying Foong Chiou bill to Medicare?
In 2024, Dr. Chiou's most billed Medicare services were nursing facility care (99310), nursing facility care (99308) and office visit, established patient (99214).
Show 4 more questionsShow fewer questions
Where did Dr. David Ying Foong Chiou go to medical school?
Dr. Chiou graduated from University of Wisconsin School of Medicine in 1996.
What drugs does Dr. David Ying Foong Chiou prescribe most?
In 2024 Medicare Part D data, Dr. Chiou's most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Levothyroxine Sodium.
Has Dr. David Ying Foong Chiou received payments from drug or device companies?
CMS Open Payments shows $8,486 in general payments to Dr. Chiou from 49 companies from 2016 to 2025. The largest total came from Novo Nordisk Inc.
How long has Dr. David Ying Foong Chiou been practicing?
Dr. Chiou graduated from medical school in 1996, 30 years ago.
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