Mary Holland, PSY.D.
NPI 1548793672 · Psychologist · Oakbrook Terrace, IL
Enrolled with Medicare as Practitioner - Clinical Psychologist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mary Holland, PSY.D. is a Psychologist provider in Oakbrook Terrace, IL (NPI 1548793672).
Provider details
- NPI number
- 1548793672
- Entity type
- Individual
- Primary specialty
- PsychologistBehavioral Health & Social Service Providers
- Credential
- PSY.D.
- Sex
- Female
- Sole proprietor
- No
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
9 yrs in NPPES registry
- Profile completeness28% of score
83% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
534 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Psychotherapy, 30 Minutes90832 | 203 | $79 |
| Psychotherapy, 30 Minutes90832 | 187 | $69 |
| Psychiatric Diagnostic Evaluation90791 | 46 | $174 |
| Psychotherapy, 1 Hour90837 | 41 | $154 |
| Psychotherapy, 45 Minutes90834 | 36 | $104 |
| Psychiatric Diagnostic Evaluation90791 | 21 | $148 |
Typical Medicare-allowed amounts for these services range $69–$174 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2017-04-05
- Last updated
- 2024-04-30
- Certified
- 2024-04-30
Frequently asked questions
- What is Mary Holland's NPI number?
- Mary Holland's National Provider Identifier (NPI) is 1548793672, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Holland's specialty?
- Mary Holland is listed in the NPPES registry with a primary specialty of Psychologist (Behavioral Health & Social Service Providers).
- Where is Mary Holland located?
- Mary Holland's practice location on file with NPPES is 17w727 Butterfield Rd Ste G, Oakbrook Terrace, IL 60181-4278.
- What is Mary Holland's phone number?
- The practice phone number listed in the NPPES registry for Mary Holland is (630) 629-3015.
- Does Mary Holland accept Medicare?
- Mary Holland is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mary Holland's NPI active?
- Yes — Mary Holland's NPI (1548793672) is active in the NPPES registry as of the last update on 2024-04-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.