Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Dr. Daniel Paul Mass, MD

Individual provider Orthopaedic Surgery Physician · NPI 1689745002

Dr. Daniel Paul Mass, MD practises Orthopedic Surgery in Chicago, Illinois. Graduated from University of Chicago, Pritzker School of Medicine in 1975, 51 years ago. Practices with The Board of Trustees of the University of Illinois, a 1,142-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
51
Trained at
University of Chicago, Pritzker School of Medicine
Licensed in
IL
In the registry since
2006
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

5841 S Maryland Ave Mc 3079
Chicago, IL 60637-1447
Phone: (773) 702-6306
Fax: (773) 702-4378
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 1801 W Taylor St, Chicago, IL 60612-4795 — (866) 600-2273

Specialties & licences

Orthopaedic Hand Surgery Physician (primary) Taxonomy 207XS0106X · Licence 036-053003 (IL)
Orthopaedic Surgery Physician Taxonomy 207X00000X · Licence 036053003 (IL)

Record details

NPI number1689745002
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedNovember 10, 2006
Last updated in NPPESMarch 6, 2025
Certification dateMarch 6, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyORTHOPEDIC SURGERY
Also practisesHAND SURGERY
Medical schoolUNIVERSITY OF CHICAGO, PRITZKER SCHOOL OF MEDICINE
Graduated 1975 (51 years in practice)
Group practice The Board Of Trustees Of The University Of Illinois — 1142 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients29
Services billed 69 a service is one billed item, such as a visit, a test or a procedure
Average patient age70

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $96 4 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at The Board of Trustees of the University of Illinois

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1142 clinicians in the practice; 12 are shown here.

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