Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Marissa Allison Wills, LMHC, NCC

Individual provider Mental Health Counselor · NPI 1619584729

Marissa Allison Wills, LMHC, NCC is a Mental Health Counselor in Indianapolis, Indiana. Qualified in 2012, 14 years ago. Practices with The Health and Hospital Corporation of Marion County, a 241-clinician group and accepts Medicare assignment. Licensed in Indiana.

Years since qualifying
14
Licensed in
IN
In the registry since
2020
What do these letters mean?
LMHC — Licensed Mental Health Counselor
A licensed mental health counsellor; the title used in Florida, New York and Washington among others.
NCC — National Certified Counselor
A counsellor certified by the NBCC.

See every abbreviation used in this directory →

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Practice location Address checks out

1700 N Illinois St
Indianapolis, IN 46202-1316
Phone: (317) 880-8491
Show map & directions

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

Specialties & licences

Mental Health Counselor (primary) Taxonomy 101YM0800X · Licence 39002688A (IN)

Record details

NPI number1619584729
Entity typeIndividual (Type 1)
GenderFemale
Credentials LMHC , NCC
Sole proprietorYes
NPI enumeratedSeptember 23, 2020
Last updated in NPPESOctober 2, 2025
Certification dateOctober 2, 2025

Medicare enrollment

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

Medicare specialtyMENTAL HEALTH COUNSELOR
Medical schoolOTHER
Graduated 2012 (14 years in practice)
Group practice The Health And Hospital Corporation Of Marion County — 241 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 patients49
Services billed 49 a service is one billed item, such as a visit, a test or a procedure
Average patient age43

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.

Colleagues at The Health and Hospital Corporation of Marion County

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 241 clinicians in the practice; 12 are shown here.

Other providers in Indianapolis