Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

JOHN EWING HARRIS PHD
NPI 1558359828
Psychologist in Springfield, IL

Active since October 11, 2005PECOS Enrolled
3435 LIBERTY DR STE D, SPRINGFIELD, IL 62704(217) 546-3118(217) 546-3184 Get Directions Write a Review

NPPES record last updated: November 3, 2026. Verified against the NPPES registry weekly; last sync: November 08, 2026.

Record update history: Nov 3, 2026, Feb 14, 2021 (2 updates tracked since 2021).

About John Ewing Harris Phd NPPES

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

JOHN EWING HARRIS PHD (NPI 1558359828) is an individual psychologist in Springfield, Illinois, licensed in Illinois (071005273) and active in the NPI registry since October 2005. He is enrolled in Medicare PECOS and is a graduate of Texas Tech University Health Science Center School Of Medicine (1975).

NPPES Registry Identity

NPI1558359828
Entity TypeIndividualMale
Primary Taxonomy103T00000X
Provider Legal NameJOHN EWING HARRISCredential: PHD
Location Address3435 LIBERTY DR STE DSpringfield, IL 62704-6598
Mailing Address3435 Liberty Dr Ste DSpringfield, IL 62704-6598 · (217) 546-3118 · Fax (217) 546-3184
Fax(217) 546-3184
Sole ProprietorNo
Medical School CMSTexas Tech University Health Science Center School Of MedicineGraduated 1975
Enumeration DateOctober 11, 2005
Last NPPES UpdateNovember 3, 20262 updates tracked since enumeration
NPPES CertifiedNovember 3, 2026
✔ NPI 1558359828 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychologistBehavioral Health & Social Service Providers
Taxonomy Code103T00000X
License✔ Licensed in IL · 071005273
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.
3435 LIBERTY DR STE D, Springfield, IL 62704

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

John Ewing Harris 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 ID1052481611
PECOS Enrollment IDI20080609000496
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 John Harris reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Clinical
3435 LIBERTY DR STE D
Springfield, IL 62704
  • Reassigned Medicare billing, Illinois enrollment
  • Medicare enrollment name: Psychological Services Of Central Illinois PC
  • 8 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.

Areas of Expertise CMS Part B claims

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Psychotherapy, 1 hour 90837
Psychotherapy is a therapeutic interaction or treatment between a trained professional and a patient. In a 1-hour session, you'll talk about your feelings, thoughts, and behaviors to help identify and manage mental health issues. This process aids in personal growth, healing, and improved well-being.
265 services20 patients

Other Providers at the Same Location NPPES 4

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

Psychologist (Clinical)
3435 LIBERTY DR STE D
SPRINGFIELD, IL 62704
Social Worker (Clinical)
3435 LIBERTY DR STE D
SPRINGFIELD, IL 62704
Psychologist (Clinical)
3435 LIBERTY DR STE D
SPRINGFIELD, IL 62704
Psychologist (Clinical)
3435 LIBERTY DR STE D
SPRINGFIELD, IL 62704

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 John Harris's NPI number?

The NPI number for John Harris is 1558359828. It was assigned to this individual provider in the NPPES registry on October 11, 2005.

Where is John Harris located?

John Harris practices at 3435 Liberty Dr Ste D, Springfield, IL 62704. The listed phone number is (217) 546-3118.

What is John Harris's specialty?

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

Is John Harris enrolled in Medicare?

Yes. John Harris 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 John Harris's services?

According to the CMS Revalidation Reassignment List (October 2026 release), John Harris reassigns Medicare benefits to Psychological Services Of Central Illinois, P.C. (Springfield, IL). 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 John Harris's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for John Harris was last updated on November 3, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 days 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.