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

Sharon Greiner, MSN, CNM, FNP-BC

Individual provider Family Nurse Practitioner · NPI 1477218444

Sharon Greiner, MSN, CNM, FNP-BC is a Nurse Practitioner in Merrillville, Indiana. Qualified in 2021, 5 years ago. Practices with Midwest Express Care 4 LLC, a 63-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Indiana.

Years since qualifying
5
Licensed in
IN
In the registry since
2021
Specialties on file
2
What do these letters mean?
MSN — Master of Science in Nursing
A graduate nursing degree, usually held alongside an advanced practice licence.
CNM — Certified Nurse-Midwife
An advanced practice nurse who provides prenatal care and delivers babies.
FNP-BC — Family Nurse Practitioner, Board Certified
A family nurse practitioner certified by the ANCC.

See every abbreviation used in this directory →

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Practice location Address checks out

6901 Broadway
Merrillville, IN 46410-3535
Phone: (219) 763-8112
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 1923 W Glen Park Ave, Griffith, IN 46319-3703 — (219) 922-2535

Specialties & licences

Advanced Practice Midwife (primary) Taxonomy 367A00000X · Licence 09000477A (IN)
Family Nurse Practitioner Taxonomy 363LF0000X · Licence 71012214A (IN)

Record details

NPI number1477218444
Entity typeIndividual (Type 1)
GenderFemale
Credentials MSN , CNM , FNP-BC
Sole proprietorNo
NPI enumeratedNovember 4, 2021
Last updated in NPPESSeptember 12, 2024
Certification dateSeptember 12, 2024

Medicare enrollment

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

Medicare specialtyNURSE PRACTITIONER
Medical schoolOTHER
Graduated 2021 (5 years in practice)
Group practice Midwest Express Care 4 Llc — 63 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 patients54
Services billed 210 a service is one billed item, such as a visit, a test or a procedure
Average patient age69

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 $18 1 payment · 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.

Colleagues at Midwest Express Care 4 LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 63 clinicians in the practice; 12 are shown here.

Other providers in Merrillville