DR. LINDSEY WILLIS WILLIAMS PHD
NPI 1639546773
Psychologist in Indianapolis, IN

Active since August 24, 2015PECOS EnrolledAccepts Medicare Assignment
355 W 16TH ST, SUITE 4800, INDIANAPOLIS, IN 46202(317) 963-7316 Get Directions Write a Review

NPPES record last updated: March 29, 2021. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Mar 29, 2021, Feb 4, 2021 (2 updates tracked since 2021).

About Dr. Lindsey Willis Williams Phd NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. LINDSEY WILLIS WILLIAMS PHD (NPI 1639546773) is an individual psychologist in Indianapolis, Indiana and active in the NPI registry since August 2015. She is enrolled in Medicare PECOS and is a graduate of Other (2016).

NPPES Registry Identity

NPI1639546773
Entity TypeIndividualFemale
Primary Taxonomy103T00000X
Provider Legal NameDR. LINDSEY WILLIS WILLIAMSCredential: PHD
Location Address355 W 16TH ST, SUITE 4800Indianapolis, IN 46202-2207
Mailing Address355 W 16th St, Suite 4800Indianapolis, IN 46202-2207 · (317) 963-7316
Sole ProprietorYes
Medical School CMSOtherGraduated 2016
Enumeration DateAugust 24, 2015
Last NPPES UpdateMarch 29, 20212 updates tracked since enumeration
NPPES CertifiedMarch 29, 2021
✔ NPI 1639546773 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPsychologistBehavioral Health & Social Service Providers
Taxonomy Code103T00000X
Definition
A psychologist is an individual who is licensed to practice psychology which is defined as the observation, description, evaluation, interpretation, and modification of human behavior by the application of psychological principles, methods, and procedures, for the purpose of preventing or eliminating symptomatic, maladaptive, or undesired behavior and of enhancing interpersonal relationships, work and life adjustment, personal effectiveness, behavioral health, and mental health. The practice of psychology includes, but is not limited to, psychological testing and the evaluation or assessment of personal characteristics, such as intelligence, personality, abilities, interests, aptitudes, and neuropsychological functioning; counseling, psychoanalysis, psychotherapy, hypnosis, biofeedback, and behavior analysis and therapy; diagnosis and treatment of mental and emotional disorder or disability, alcoholism and substance abuse, disorders of habit or conduct, as well as of the psychological aspects of physical illness, accident, injury, or disability; and psycheducational evaluation, therapy, remediation, and consultation. Psychological services may be rendered to individuals, families, groups and the public.
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X · License 000
355 W 16TH ST, Indianapolis, IN 46202

Accepted Insurance

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Lindsey Willis Williams Phd is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID2961765144
PECOS Enrollment IDI20180423000950
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment– Home Health Agency– Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Lindsey Williams reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Neurological Surgery
2206 WILBORN AVE, SUITE ONE
South Boston, VA 24592
  • Reassigned Medicare billing, North Carolina enrollment
  • 2,797 clinicians in this Medicare group

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

Social Worker
355 W 16TH ST
INDIANAPOLIS, IN 46202
Psychologist (Clinical)
355 W 16TH ST
INDIANAPOLIS, IN 46202
Psychiatry & Neurology (Psychiatry)
355 W 16TH ST
INDIANAPOLIS, IN 46202
Psychiatry & Neurology (Psychiatry)
355 W 16TH ST
INDIANAPOLIS, IN 46202
Psychiatry & Neurology (Psychiatry)
355 W 16TH ST
INDIANAPOLIS, IN 46202
Psychiatry & Neurology (Neurology)
355 W 16TH ST, STE 3200
INDIANAPOLIS, IN 46202
Student in an Organized Health Care Education/Training Program
355 W 16TH ST
INDIANAPOLIS, IN 46202
Registered Nurse
355 W 16TH ST, 5100
INDIANAPOLIS, IN 46202

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Lindsey Williams's NPI number?

The NPI number for Lindsey Williams is 1639546773. It was assigned to this individual provider in the NPPES registry on August 24, 2015.

Where is Lindsey Williams located?

Lindsey Williams practices at 355 W 16th St Suite 4800, Indianapolis, IN 46202. The listed phone number is (317) 963-7316.

What is Lindsey Williams's specialty?

The primary specialty registered for this NPI is Psychologist with taxonomy code 103T00000X.

Is Lindsey Williams enrolled in Medicare?

Yes. Lindsey Williams is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for Lindsey Williams's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Lindsey Williams reassigns Medicare benefits to University Of North Carolina At Chapel Hill (South Boston, VA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Lindsey Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Lindsey Williams accept?

Health plans from Blue Cross and Blue Shield of NC, Oscar Health Plan of North Carolina, Inc and UnitedHealthcare list Lindsey Williams as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Lindsey Williams was last updated on March 29, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.