DR. MARY HOLLAND PSY.D.
NPI 1548793672
Psychologist in Oakbrook Terrace, IL

Active since April 05, 2017PECOS Enrolled
17W727 BUTTERFIELD RD STE G, OAKBROOK TERRACE, IL 60181(630) 629-3015 Get Directions Write a Review

NPPES record last updated: April 30, 2024. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Dr. Mary Holland Psy.d. NPPES

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

DR. MARY HOLLAND PSY.D. (NPI 1548793672) is an individual psychologist in Oakbrook Terrace, Illinois and active in the NPI registry since April 2017. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1548793672
Entity TypeIndividualFemale
Primary Taxonomy103T00000X
Provider Legal NameDR. MARY HOLLANDCredential: PSY.D.
Location Address17W727 BUTTERFIELD RD STE GOakbrook Terrace, IL 60181-4278
Mailing Address8928 Middleton RdDarien, IL 60561-8441 · (630) 629-3015
Sole ProprietorNo
Enumeration DateApril 5, 2017
Last NPPES UpdateApril 30, 2024
NPPES CertifiedApril 30, 2024
✔ NPI 1548793672 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ 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.
17W727 BUTTERFIELD RD STE G, Oakbrook Terrace, IL 60181

Accepted Insurance

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Mary Holland Psy.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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 Reassignments

4

Medicare enrollment records show Mary Holland reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Hospitalist
15 SALT CREEK LN
Hinsdale, IL 60521
  • Reassigned Medicare billing, Illinois enrollment
  • 52 clinicians in this Medicare group
Hospitalist
1001 N GREENWOOD AVE
Park Ridge, IL 60068
  • Reassigned Medicare billing, Illinois enrollment
  • 44 clinicians in this Medicare group
Hospitalist
1001 E ALEX BELL RD
Dayton, OH 45459
  • Reassigned Medicare billing, Illinois enrollment
  • 43 clinicians in this Medicare group
Hospitalist
10550 PARK RUN DR
Las Vegas, NV 89144
  • Reassigned Medicare billing, Illinois enrollment
  • 33 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 6

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, 30 minutes 90832
Psychotherapy is a therapeutic interaction or treatment between a trained professional and a patient. In a 30-minute session, the therapist helps you explore feelings, thoughts, and behaviors to better understand yourself and manage life's challenges.
203 services29 patients
Psychotherapy, 30 minutes 90832
Psychotherapy is a therapeutic interaction or treatment between a trained professional and a patient. In a 30-minute session, the therapist helps you explore feelings, thoughts, and behaviors to better understand yourself and manage life's challenges.
187 services17 patients
Psychiatric diagnostic evaluation 90791
A psychiatric diagnostic evaluation is a thorough assessment used to identify any mental health conditions you may have. It involves a detailed discussion about your symptoms, thoughts, feelings and behavior patterns. Your medical history and family's mental health history are also considered.
46 services46 patients
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.
41 services14 patients
Psychotherapy, 45 minutes 90834
Psychotherapy is a treatment method where you converse with a therapist about your thoughts, feelings, and behaviors. In a 45-minute session, the therapist assists you in understanding and managing your mental health concerns, improving emotional wellness, and promoting personal growth.
36 services12 patients
Psychiatric diagnostic evaluation 90791
A psychiatric diagnostic evaluation is a thorough assessment used to identify any mental health conditions you may have. It involves a detailed discussion about your symptoms, thoughts, feelings and behavior patterns. Your medical history and family's mental health history are also considered.
21 services21 patients

Other Providers at the Same Location NPPES

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

Durable Medical Equipment & Medical Supplies
17W727 BUTTERFIELD RD STE G
OAKBROOK TERRACE, IL 60181

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 Mary Holland's NPI number?

The NPI number for Mary Holland is 1548793672. It was assigned to this individual provider in the NPPES registry on April 5, 2017.

Where is Mary Holland located?

Mary Holland practices at 17w727 Butterfield Rd Ste G, Oakbrook Terrace, IL 60181. The listed phone number is (630) 629-3015.

What is Mary Holland's specialty?

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

Is Mary Holland enrolled in Medicare?

Yes. Mary Holland is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Mary Holland's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Mary Holland reassigns Medicare benefits to 4 organizations: Illinois Post-Acute Medical Services 1 PC (Hinsdale, IL), Cs Pacs 3 Il, S.C. (Park Ridge, IL), Cs Pacs 3 Midwest LLC (Dayton, OH) and Nv Pacs 2 LLC (Las Vegas, NV). Each 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 Mary Holland's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Mary Holland accept?

Health plans from Oscar Health list Mary Holland 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 Mary Holland was last updated on April 30, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.