Dr. Brian D. Liem, DO
- Medicare services, 2024
- 503
- Medicare patients, 2024
- 345
- Part D claims, 2024
- 480
- MIPS score, 2024
- 84
- Hospital affiliations
- 4
- Practice address
- 745 Fletcher Dr, Elgin, IL 60123
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Elgin Gastroenterology Endoscopy Center LLC - HOPD
Acute Care Hospital outpatient department · Elgin, Illinois
Find Dr. Liem's professional email, personal email and mobile number
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Dr. Brian D. Liem is an internist in Elgin, Illinois
Dr. Liem practices at Elgin Gastroenterology Endoscopy Center LLC - HOPD in Elgin, Illinois.
Dr. Liem's NPI, 1871892232, was assigned on March 23, 2011. Dr. Liem holds Illinois license 036143026.
- NPI
- 1871892232NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2365665890
- NPI enumeration date
- March 23, 2011
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 41
- Medical school graduation
- 2011
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Brian D. Liem practices at Elgin Gastroenterology Endoscopy Center LLC - HOPD in Elgin, Illinois
Dr. Liem's primary practice is Elgin Gastroenterology Endoscopy Center LLC - HOPD, at 745 Fletcher Dr, Elgin, IL 60123.
- Elgin Gastroenterology Endoscopy Center LLC - HOPD745 Fletcher Dr, Elgin, IL 60123
Source: Dmand AI Affiliation Data
Dr. Brian D. Liem is affiliated with 7 sites of care and 1 medical group
Dr. Liem's primary practice is Elgin Gastroenterology Endoscopy Center LLC - HOPD in Elgin, Illinois. Dr. Liem is also affiliated with Advocate Sherman Hospital. The medical group on file is GI Alliance of Illinois. Dmand AI also links Dr. Liem to 3 more hospitals, 1 group practice or clinic and 1 ambulatory surgery center, each named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Brian D. Liem's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Liem practices, 7 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Elgin Gastroenterology Endoscopy Center LLC - HOPD | 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. Brian D. Liem is one of 5,652 internists in Illinois
Internal medicine is Dr. Liem's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Liem is licensed in Illinois.
Specialties and state licenses
- Internal medicine, IllinoisPrimary
Internists near Dr. Liem
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. Brian D. Liem billed Medicare for 503 services in 2024
CMS data shows 503 Medicare services from Dr. Liem across 10 procedure codes in 2024, for 345 Medicare patients. Medicare paid $48,364 for them.
Dr. Liem's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 3562024: 29118%
- Surgery
- 2023: 1262024: 17539%
- Tests and treatments
- 2023: 02024: 37
Where Dr. Liem's Medicare services took place, 2024
- In an office10220%
- In a facility40180%
Dr. Liem compared with the Illinois median for internists, 2024
- Dr. Liem
- Illinois median
- Medicare services
- 503vs 56611% below
- Medicare patients
- 345vs 20866% above
- Part D claims
- 386vs 28436% above
Medians across 5,192 internists in Illinois with Dmand AI profiles that report each measure.
Dr. Liem'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. Brian D. Liem treated 345 Medicare patients in 2024, average age 73
CMS counts 345 Medicare patients who saw Dr. Liem in 2024. The largest group is 65 to 74, with 135 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 27% are also on Medicaid. Their average risk score is 1.93, 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. Liem's median patient age at 57, with 50% women.
Dr. Liem's Medicare patients by age, 2024
Dr. Liem's Medicare patients by sex, 2024
- Women19958%
- Men14642%
Chronic conditions among Dr. Liem's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis54%
- Diabetes42%
- Chronic kidney disease40%
- Ischemic heart disease40%
- Anxiety37%
- Mood disorders37%
Share of Medicare patients with each condition. A patient can have several.
Dr. Liem's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 57
Patient panel by sex, all payers
- Women50%
- Men49%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Brian D. Liem wrote 480 Medicare Part D claims in 2024
In 2024, Dr. Liem wrote 480 Medicare Part D claims for 248 patients. 76% of them were for generic drugs. CMS names the drug for 386 of them, across 8 drugs with 11 or more claims each, at $21,795 in total drug cost. In 2023, CMS named 234 claims across 6 drugs.
Dr. Liem's Part D claims by kind of drug, 2024
- Generic364 claims76%
- Brand-name116 claims24%
Dr. Liem'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. Liem's Part D claims, 2024
- Antibiotics3%15 of 480 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: 2342024: 38665%
Drugs named by CMS: 8 in 2024, 6 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. Brian D. Liem scored 84 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 84 out of 100 for Dr. Liem for performance year 2024, reported as part of a group. Dr. Liem accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 86 procedures of upper gastrointestinal (gi) endoscopy for acid reflux by Dr. Liem, more than 73% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Dr. Liem's MIPS scores, performance year 2024
- 84of 100Final score
- 67.6of 100Quality
- 99of 100Promoting Interoperability
- 40of 100Improvement Activities
- 81of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Where Dr. Liem ranks in Medicare procedure volume
- Upper gastrointestinal (GI) endoscopy for acid reflux
- 73rd percentile86 procedures
- Colonoscopy
- 73rd percentile75 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026; and Doctors and Clinicians Utilization Data (CMS)
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Dr. Brian D. Liem received $3,425 in industry payments from 2016 to 2025
CMS Open Payments shows 58 general payments to Dr. Liem from 22 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 63% of the total. Boston Scientific Corporation paid the most, $1,338.
General payments to Dr. Liem by program year, 2016 to 2025
General payments to Dr. Liem by kind, 2016 to 2025
- Food and beverage$2,15063%
- Travel and lodging$1,18835%
- Gifts$873%
Companies that paid Dr. Liem the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Brian D. Liem's profile data
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Brian D. Liem
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. Brian D. Liem's NPI number?
Dr. Brian D. Liem's NPI number is 1871892232. It was assigned on March 23, 2011, and it is active in the NPI Registry.
What kind of doctor is Dr. Brian D. Liem?
Dr. Brian D. Liem is an internist in Elgin, Illinois. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Brian D. Liem practice?
Dr. Liem practices at 745 Fletcher Dr, Elgin, IL 60123. Dr. Liem's primary practice is Elgin Gastroenterology Endoscopy Center LLC - HOPD in Elgin, Illinois. Dmand AI also links Dr. Liem to 3 hospitals, 1 group practice or clinic and 1 ambulatory surgery center.
What is Dr. Brian D. Liem's medical license number?
Dr. Liem holds Illinois license 036143026.
Which hospitals is Dr. Brian D. Liem affiliated with?
Dr. Liem is affiliated with Advocate Sherman Hospital. Dmand AI links Dr. Liem to 3 more hospitals.
What medical group is Dr. Brian D. Liem part of?
Dr. Liem is linked to GI Alliance of Illinois.
Does Dr. Brian D. Liem accept Medicare?
Yes. CMS data shows Dr. Liem billed Medicare for 503 services in 2024, and Dr. Liem accepts Medicare assignment.
What is Dr. Brian D. Liem's MIPS score?
Dr. Liem's MIPS final score for performance year 2024 is 84 out of 100, reported as part of a group.
How many Medicare patients does Dr. Brian D. Liem see?
CMS counts 345 Medicare patients who saw Dr. Liem in 2024, with an average age of 73.
What services does Dr. Brian D. Liem bill to Medicare?
In 2024, Dr. Liem's most billed Medicare services were hospital inpatient care (99222), hospital inpatient care (99232) and office visit, established patient (99214).
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What drugs does Dr. Brian D. Liem prescribe most?
In 2024 Medicare Part D data, Dr. Liem's most prescribed drugs by claims were Pantoprazole Sodium, Omeprazole and Sod Sulf-Potass Sulf-Mag Sulf.
Has Dr. Brian D. Liem received payments from drug or device companies?
CMS Open Payments shows $3,425 in general payments to Dr. Liem from 22 companies from 2016 to 2025. The largest total came from Boston Scientific Corporation.
How long has Dr. Brian D. Liem been practicing?
Dr. Liem graduated from medical school in 2011, 15 years ago.
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