Dr. Sarah Joy Zielsdorf, MD, MS
- Medicare services, 2017
- 29
- Part D claims, 2024
- 229
- Hospital affiliations
- 1
- Industry payments
- $1,408
- State license
- 1
- Practice address
- 801 South Washington, Naperville, IL 60540
- Practice phone
- Call (630) 527-3000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Zielsdorf's professional email, personal email and mobile number
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Dr. Sarah Joy Zielsdorf is an internist in Naperville, Illinois
Dr. Zielsdorf practices at Edward Hospital in Naperville, Illinois, part of Endeavor Health.
Dr. Zielsdorf's NPI, 1679849871, was assigned on April 2, 2012. Dr. Zielsdorf holds Illinois license BF 4649604-A 971.
- NPI
- 1679849871NPI Registry (opens in a new tab)
- NPI enumeration date
- April 2, 2012
- NPI status
- Active
- Practice phone
- (630) 527-3000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Sarah Joy Zielsdorf practices at Edward Hospital in Naperville, Illinois
Dr. Zielsdorf's primary practice is Edward Hospital, at 801 South Washington, Naperville, IL 60540 in Du Page County. The practice phone is (630) 527-3000.
- Edward Hospital801 South Washington, Naperville, IL 60540 · Du Page CountyPhone(630) 527-3000
Source: Dmand AI Affiliation Data
Dr. Sarah Joy Zielsdorf is affiliated with 1 site of care
Dr. Zielsdorf's primary practice is Edward Hospital in Naperville, Illinois, part of Endeavor Health.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Sarah Joy Zielsdorf's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Zielsdorf practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Edward Hospital | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Sarah Joy Zielsdorf is one of 5,652 internists in Illinois
Internal medicine is Dr. Zielsdorf's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Zielsdorf is licensed in Illinois.
Specialties and state licenses
- Internal medicine, IllinoisPrimary
Internists near Dr. Zielsdorf
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 Joy Zielsdorf billed Medicare for 29 services in 2017
CMS data shows 29 Medicare services from Dr. Zielsdorf across 1 procedure code in 2017, all of them office visits. Medicare paid $1,712 for them. Every service was in an office.
Dr. Zielsdorf's Medicare services by type, 2016 to 2017
- 2016
- 2017
- Office and hospital visits
- 2016: 1542017: 2981%
- Tests and treatments
- 2016: 302017: 0100%
Dr. Zielsdorf compared with the Illinois median for internists, 2017
- Dr. Zielsdorf
- Illinois median
- Medicare services
- 29vs 56695% below
- Part D claims
- 166vs 28442% below
Medians across 5,192 internists in Illinois with Dmand AI profiles that report each measure.
Dr. Zielsdorf's most billed Medicare procedure codes, 2017
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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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Zielsdorf and other internists in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Sarah Joy Zielsdorf's patients have a median age of 55
Across all payers, Dmand AI patient panel data puts Dr. Zielsdorf's median patient age at 55, with 89% women.
Dr. Zielsdorf's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 55
Patient panel by sex, all payers
- Women89%
- Men11%
Source: Dmand AI Patient Panel Data
Dr. Sarah Joy Zielsdorf wrote 229 Medicare Part D claims in 2024
In 2024, Dr. Zielsdorf wrote 229 Medicare Part D claims for 47 patients. 62% of them were for generic drugs. CMS names the drug for 166 of them, across 7 drugs with 11 or more claims each, at $15,764 in total drug cost. In 2023, CMS named 155 claims across 7 drugs.
Dr. Zielsdorf's Part D claims by kind of drug, 2024
- Generic143 claims62%
- Brand-name53 claims23%
- Other33 claims14%
Dr. Zielsdorf'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.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1552024: 1667%
Drugs named by CMS: 7 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. Sarah Joy Zielsdorf received $1,408 in industry payments from 2016 to 2025
CMS Open Payments shows 16 general payments to Dr. Zielsdorf from 9 drug and device companies from 2016 to 2025. Consulting fees make up the largest share, 85% of the total. IBSA Pharma Inc. paid the most, $1,213.
General payments to Dr. Zielsdorf by program year, 2016 to 2025
General payments to Dr. Zielsdorf by kind, 2016 to 2025
- Consulting fees$1,20085%
- Food and beverage$20815%
Companies that paid Dr. Zielsdorf 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. Sarah Joy Zielsdorf'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)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| 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. Sarah Joy Zielsdorf
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 Joy Zielsdorf's NPI number?
Dr. Sarah Joy Zielsdorf's NPI number is 1679849871. It was assigned on April 2, 2012, and it is active in the NPI Registry.
What kind of doctor is Dr. Sarah Joy Zielsdorf?
Dr. Sarah Joy Zielsdorf is an internist in Naperville, Illinois. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Sarah Joy Zielsdorf practice?
Dr. Zielsdorf practices at 801 South Washington, Naperville, IL 60540. Dr. Zielsdorf's primary practice is Edward Hospital in Naperville, Illinois, part of Endeavor Health.
What is Dr. Sarah Joy Zielsdorf's office phone number?
The practice phone on file for Dr. Zielsdorf is (630) 527-3000.
What is Dr. Sarah Joy Zielsdorf's medical license number?
Dr. Zielsdorf holds Illinois license BF 4649604-A 971.
Which hospitals is Dr. Sarah Joy Zielsdorf affiliated with?
Dr. Zielsdorf practices at Edward Hospital in Naperville, Illinois.
Does Dr. Sarah Joy Zielsdorf accept Medicare?
Yes. CMS data shows Dr. Zielsdorf billed Medicare for 29 services in 2017.
What services does Dr. Sarah Joy Zielsdorf bill to Medicare?
In 2017, Dr. Zielsdorf's most billed Medicare services were office visit, established patient (99214).
What drugs does Dr. Sarah Joy Zielsdorf prescribe most?
In 2024 Medicare Part D data, Dr. Zielsdorf's most prescribed drugs by claims were Liothyronine Sodium, Armour Thyroid and Synthroid.
Has Dr. Sarah Joy Zielsdorf received payments from drug or device companies?
CMS Open Payments shows $1,408 in general payments to Dr. Zielsdorf from 9 companies from 2016 to 2025. The largest total came from IBSA Pharma Inc.
How long has Dr. Sarah Joy Zielsdorf been practicing?
Dr. Zielsdorf's NPI was assigned in 2012.
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