Dr. Sarah E. Messmer, MD
- Medicare services, 2022
- 45
- Part D claims, 2022
- 12
- MIPS score, 2024
- 93
- Hospital affiliations
- 1
- Industry payments
- $23
- Practice address
- 1740 West Taylor St Suite 1400, Chicago, IL 60612
- Practice phone
- Call (312) 996-3900
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Messmer's professional email, personal email and mobile number
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Dr. Sarah E. Messmer is an internist in Chicago, Illinois
Dr. Messmer practices at University of Illinois Hospital in Chicago, Illinois, part of University of Illinois System.
Dr. Messmer's NPI, 1073926929, was assigned on June 9, 2014. Dr. Messmer graduated from Harvard Medical School in 2014. Dr. Messmer holds Illinois license 036.145844.
- NPI
- 1073926929NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5799902094
- NPI enumeration date
- June 9, 2014
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (312) 996-3900
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 38
- Medical school graduation
- 2014
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Sarah E. Messmer practices at University of Illinois Hospital in Chicago, Illinois
Dr. Messmer's primary practice is University of Illinois Hospital, at 1740 West Taylor St Suite 1400, Chicago, IL 60612 in Cook County. The practice phone is (312) 996-3900.
- University of Illinois Hospital1740 West Taylor St Suite 1400, Chicago, IL 60612 · Cook CountyPhone(312) 996-3900
Source: Dmand AI Affiliation Data
Dr. Sarah E. Messmer is affiliated with 2 sites of care and 1 medical group
Dr. Messmer's primary practice is University of Illinois Hospital in Chicago, Illinois, part of University of Illinois System. The medical group on file is University of Illinois Physicians Group (UIPG). Dmand AI also links Dr. Messmer to 1 more group practice or clinic, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Sarah E. Messmer's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Messmer practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| University of Illinois Hospital | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Sarah E. Messmer is one of 5,652 internists in Illinois
Internal medicine is Dr. Messmer's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dmand AI has Dr. Messmer's licenses on file in 2 states: Illinois and Massachusetts.
Specialties and state licenses
- Internal medicine, IllinoisPrimary
- Massachusetts license
Internists near Dr. Messmer
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. Sarah E. Messmer billed Medicare for 45 services in 2022
CMS data shows 45 Medicare services from Dr. Messmer across 2 procedure codes in 2022, all of them office visits. Medicare paid $2,658 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Messmer's Medicare services by type, 2021 to 2022
- 2021
- 2022
- Office and hospital visits
- 2021: 802022: 4544%
Dr. Messmer compared with the Illinois median for internists, 2022
- Dr. Messmer
- Illinois median
- Medicare services
- 45vs 56692% below
- Part D claims
- 12vs 28496% below
Medians across 5,192 internists in Illinois with Dmand AI profiles that report each measure.
Dr. Messmer's most billed Medicare procedure codes, 2022
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. Messmer?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Messmer and other internists in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Sarah E. Messmer's patients have a median age of 6
Across all payers, Dmand AI patient panel data puts Dr. Messmer's median patient age at 6, with 32% women.
Dr. Messmer's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 6
Patient panel by sex, all payers
- Women32%
- Men68%
Source: Dmand AI Patient Panel Data
Dr. Sarah E. Messmer wrote 12 Medicare Part D claims in 2022
In 2022, Dr. Messmer wrote 12 Medicare Part D claims. They cover 1 drug, with $8,079 in total drug cost. In 2021, CMS named 37 claims across 2 drugs.
Dr. Messmer's most prescribed drugs by claims, 2022
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2021 to 2022
- 2021
- 2022
- Claims for drugs CMS names
- 2021: 372022: 1268%
Drugs named by CMS: 1 in 2022, 2 in 2021.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
Dr. Sarah E. Messmer scored 93 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 93 out of 100 for Dr. Messmer for performance year 2024, reported as part of a group. Dr. Messmer accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Messmer's MIPS scores, performance year 2024
- 93of 100Final score
- 73.5of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 71of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Sarah E. Messmer received $23 in industry payments in 2022
CMS Open Payments shows 1 general payment to Dr. Messmer from 1 drug or device company in 2022. Food and beverage make up the largest share, 100% of the total. Abbvie Inc. paid the most, $23.
Companies that paid Dr. Messmer the most, 2022 to 2022
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Sarah E. Messmer graduated from Harvard Medical School
Dr. Messmer graduated from Harvard Medical School in 2014.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Sarah E. Messmer'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 Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (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)Clinician Public Reporting: Overall MIPS Performance (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. Sarah E. Messmer
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. Sarah E. Messmer's NPI number?
Dr. Sarah E. Messmer's NPI number is 1073926929. It was assigned on June 9, 2014, and it is active in the NPI Registry.
What kind of doctor is Dr. Sarah E. Messmer?
Dr. Sarah E. Messmer is an internist in Chicago, Illinois. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Sarah E. Messmer practice?
Dr. Messmer practices at 1740 West Taylor St Suite 1400, Chicago, IL 60612. Dr. Messmer's primary practice is University of Illinois Hospital in Chicago, Illinois, part of University of Illinois System. Dmand AI also links Dr. Messmer to 1 group practice or clinic.
What is Dr. Sarah E. Messmer's office phone number?
The practice phone on file for Dr. Messmer is (312) 996-3900.
What is Dr. Sarah E. Messmer's medical license number?
Dr. Messmer holds Illinois license 036.145844, one of the licenses on file in 2 states.
Which states has Dr. Sarah E. Messmer been licensed in?
Dmand AI has state licenses on file for Dr. Messmer in Illinois and Massachusetts.
Which hospitals is Dr. Sarah E. Messmer affiliated with?
Dr. Messmer practices at University of Illinois Hospital in Chicago, Illinois.
What medical group is Dr. Sarah E. Messmer part of?
Dr. Messmer is linked to University of Illinois Physicians Group (UIPG).
Does Dr. Sarah E. Messmer accept Medicare?
Yes. CMS data shows Dr. Messmer billed Medicare for 45 services in 2022, and Dr. Messmer accepts Medicare assignment.
What is Dr. Sarah E. Messmer's MIPS score?
Dr. Messmer's MIPS final score for performance year 2024 is 93 out of 100, reported as part of a group.
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What services does Dr. Sarah E. Messmer bill to Medicare?
In 2022, Dr. Messmer's most billed Medicare services were office visit, established patient (99214) and office visit, established patient (99213).
Where did Dr. Sarah E. Messmer go to medical school?
Dr. Messmer graduated from Harvard Medical School in 2014.
What drugs does Dr. Sarah E. Messmer prescribe most?
In 2022 Medicare Part D data, Dr. Messmer's most prescribed drugs by claims were Eliquis.
Has Dr. Sarah E. Messmer received payments from drug or device companies?
CMS Open Payments shows $23 in general payments to Dr. Messmer from 1 company from 2022 to 2022. The largest total came from Abbvie Inc.
How long has Dr. Sarah E. Messmer been practicing?
Dr. Messmer graduated from medical school in 2014, 12 years ago.
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