Dr. Chong H. Pak, MD
- Medicare services, 2024
- 1,089
- Medicare patients, 2024
- 318
- Part D claims, 2024
- 221
- Publications
- 1
- Hospital affiliations
- 3
- Practice address
- 1555 N Barrington Rd, Hoffman Estates, IL 60169
- Practice phone
- Call (847) 843-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Pak'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. Chong H. Pak is a hospitalist in Hoffman Estates, Illinois
Dr. Pak practices at Ascension Saint Alexius in Hoffman Estates, Illinois, part of Ascension Health Alliance.
Dr. Pak's NPI, 1003926296, was assigned on August 30, 2006. Dr. Pak holds Illinois license 036-112526.
- NPI
- 1003926296NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4284679663
- NPI enumeration date
- August 30, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (847) 843-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 50
- Medical school graduation
- 2002
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Chong H. Pak practices at Ascension Saint Alexius in Hoffman Estates, Illinois
Dr. Pak's primary practice is Ascension Saint Alexius, at 1555 N Barrington Rd, Hoffman Estates, IL 60169 in Cook County. The practice phone is (847) 843-2000.
- Ascension Saint Alexius1555 N Barrington Rd, Hoffman Estates, IL 60169 · Cook CountyPhone(847) 843-2000
Source: Dmand AI Affiliation Data
Dr. Chong H. Pak is affiliated with 4 sites of care and 6 medical groups
Dr. Pak's primary practice is Ascension Saint Alexius in Hoffman Estates, Illinois, part of Ascension Health Alliance. Dr. Pak is also affiliated with Northwest Community Hospital. The medical group on file is Endeavor Health Medical Group. Dmand AI also links Dr. Pak to 1 more hospital, 5 medical groups and 1 breast imaging center, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Chong H. Pak's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Pak practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Ascension Saint Alexius | Available with a free account |
| +3 more sites and 5 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 Ascension Health Alliance and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Chong H. Pak is one of 1,321 hospitalists in Illinois
Hospitalist is Dr. Pak's primary specialty in the NPI Registry, under taxonomy code 208M00000X. Dr. Pak is licensed in Illinois.
Specialties and state licenses
- Hospitalist, IllinoisPrimary
Hospitalists near Dr. Pak
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. Chong H. Pak billed Medicare for 1,089 services in 2024
CMS data shows 1,089 Medicare services from Dr. Pak across 5 procedure codes in 2024, for 318 Medicare patients. Medicare paid $99,776 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Pak's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1,0652024: 1,0892%
Dr. Pak compared with the Illinois median for hospitalists, 2024
- Dr. Pak
- Illinois median
- Medicare services
- 1,089vs 5432.0 times
- Medicare patients
- 318vs 24231% above
- Part D claims
- 63vs 5319% above
Medians across 1,248 hospitalists in Illinois with Dmand AI profiles that report each measure.
Dr. Pak'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. Pak?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Pak and other hospitalists in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Chong H. Pak treated 318 Medicare patients in 2024, average age 77
CMS counts 318 Medicare patients who saw Dr. Pak in 2024. The largest group is 75 to 84, with 114 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 20% are also on Medicaid. Their average risk score is 2.66, 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. Pak's median patient age at 76, with 55% women.
Dr. Pak's Medicare patients by age, 2024
Dr. Pak's Medicare patients by sex, 2024
- Women18257%
- Men13643%
Chronic conditions among Dr. Pak's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis63%
- Ischemic heart disease55%
- Chronic kidney disease52%
- Heart failure51%
- Diabetes50%
- Mood disorders44%
Share of Medicare patients with each condition. A patient can have several.
Dr. Pak'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
- Women55%
- Men44%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Chong H. Pak wrote 221 Medicare Part D claims in 2024
In 2024, Dr. Pak wrote 221 Medicare Part D claims for 133 patients. 90% of them were for generic drugs. CMS names the drug for 63 of them, across 5 drugs with 11 or more claims each, at $381 in total drug cost. In 2023, CMS named 71 claims across 4 drugs.
Dr. Pak's Part D claims by kind of drug, 2024
- Generic198 claims90%
- Brand-name and other23 claims10%
Dr. Pak'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. Pak's Part D claims, 2024
- Opioids14%31 of 221 claims
- Antibiotics10%21 of 221 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: 712024: 6311%
Drugs named by CMS: 5 in 2024, 4 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. Chong H. Pak takes part in Medicare
Dr. Pak 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)
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. Chong H. Pak has 1 publication on record
Dmand AI links 1 paper to Dr. Pak in 2011. Dr. Pak's most frequent co-authors are Glenn Carey Landon, MD and Sherwin Jay Siff, MD.
Dr. Pak's most frequent co-authors
Recent publications by Dr. Pak
See who Dr. Pak researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Pak 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. Chong H. Pak received $1,330 in industry payments from 2016 to 2019
CMS Open Payments shows 94 general payments to Dr. Pak from 18 drug and device companies from 2016 to 2019. Food and beverage make up the largest share, 100% of the total. Janssen Pharmaceuticals, Inc paid the most, $275.
General payments to Dr. Pak by program year, 2016 to 2019
Companies that paid Dr. Pak the most, 2016 to 2019
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Chong H. Pak'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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (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) |
| 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. Chong H. Pak
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. Chong H. Pak's NPI number?
Dr. Chong H. Pak's NPI number is 1003926296. It was assigned on August 30, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Chong H. Pak?
Dr. Chong H. Pak is a hospitalist in Hoffman Estates, Illinois. The primary specialty in the NPI Registry is Hospitalist Physician (taxonomy code 208M00000X).
Where does Dr. Chong H. Pak practice?
Dr. Pak practices at 1555 N Barrington Rd, Hoffman Estates, IL 60169. Dr. Pak's primary practice is Ascension Saint Alexius in Hoffman Estates, Illinois, part of Ascension Health Alliance. Dmand AI also links Dr. Pak to 1 hospital, 5 medical groups and 1 breast imaging center.
What is Dr. Chong H. Pak's office phone number?
The practice phone on file for Dr. Pak is (847) 843-2000.
What is Dr. Chong H. Pak's medical license number?
Dr. Pak holds Illinois license 036-112526.
Which hospitals is Dr. Chong H. Pak affiliated with?
Dr. Pak practices at Ascension Saint Alexius in Hoffman Estates, Illinois. Dr. Pak is also affiliated with Northwest Community Hospital. Dmand AI links Dr. Pak to 1 more hospital.
What medical group is Dr. Chong H. Pak part of?
Dr. Pak is linked to Endeavor Health Medical Group. Dmand AI links Dr. Pak to 5 more medical groups.
Does Dr. Chong H. Pak accept Medicare?
Yes. CMS data shows Dr. Pak billed Medicare for 1,089 services in 2024, and Dr. Pak accepts Medicare assignment.
How many Medicare patients does Dr. Chong H. Pak see?
CMS counts 318 Medicare patients who saw Dr. Pak in 2024, with an average age of 77.
What services does Dr. Chong H. Pak bill to Medicare?
In 2024, Dr. Pak's most billed Medicare services were hospital inpatient care (99233), hospital inpatient care (99232) and hospital inpatient care (99239).
Show 5 more questionsShow fewer questions
What drugs does Dr. Chong H. Pak prescribe most?
In 2024 Medicare Part D data, Dr. Pak's most prescribed drugs by claims were Furosemide, Hydrocodone-Acetaminophen and Amlodipine Besylate.
Has Dr. Chong H. Pak received payments from drug or device companies?
CMS Open Payments shows $1,330 in general payments to Dr. Pak from 18 companies from 2016 to 2019. The largest total came from Janssen Pharmaceuticals, Inc.
How long has Dr. Chong H. Pak been practicing?
Dr. Pak graduated from medical school in 2002, 24 years ago.
Does Dr. Chong H. Pak do research?
Dmand AI links 1 publication to Dr. Pak.
Who does Dr. Chong H. Pak publish with?
Dr. Pak's most frequent co-authors are Glenn Carey Landon, MD (1 shared paper) and Sherwin Jay Siff, MD (1 shared paper).
Selling to hospitalist practices?
See hospitalists in Illinois 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