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

Marissa Decker, MD

Individual provider Obstetrics & Gynecology Physician · NPI 1912388638

Marissa Decker, MD practises Obstetrics/Gynecology in Madison, Wisconsin. Graduated from University of Iowa, Rj & L Carver College of Medicine in 2015, 11 years ago. Practices with Dean Health Systems Inc, a 1,184-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Nebraska and Wisconsin.

Years since qualifying
11
Trained at
University of Iowa, Rj & L Carver College of Medicine
Licensed in
NE, WI
In the registry since
2015
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

752 N High Point Rd
Madison, WI 53717-2236
Phone: (608) 824-4000
Fax: (608) 824-4944
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • W180n8000 Town Hall Rd, Menomonee Falls, WI 53051-4002 — (262) 255-2500

Specialties & licences

Obstetrics & Gynecology Physician (primary) Taxonomy 207V00000X · Licence 7434 (NE)
Obstetrics & Gynecology Physician Taxonomy 207V00000X · Licence 71587-20 (WI)

Record details

NPI number1912388638
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorYes
NPI enumeratedJune 18, 2015
Last updated in NPPESJune 9, 2023
Certification dateJune 9, 2023

Medicare enrollment

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

Medicare specialtyOBSTETRICS/GYNECOLOGY
Medical schoolUNIVERSITY OF IOWA, RJ & L CARVER COLLEGE OF MEDICINE
Graduated 2015 (11 years in practice)
Group practice Dean Health Systems Inc — 1184 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Removal of the uterus 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

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 patients41
Services billed 83 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

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.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

  • Ssm Health St Mary'S Hospital - Madison Hospital · Madison, WI

Colleagues at Dean Health Systems Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1184 clinicians in the practice; 12 are shown here.

Other providers in Madison