Provider Profile
Marianne O'Leary, PhD
Unclaimed ProfileAbout Dr. O'leary
Marianne O'Leary, PhD is a clinical psychologist practicing in Ellicott City, MD. Marianne is also listed as specializing in psychologist. According to Medicare claims data, Marianne cared for 71 Medicare patients across 786 services. The services billed most often include psychotherapy, 1 hour, psychotherapy, 45 minutes, and psychotherapy, 30 minutes. This provider record is associated with NPI 1720147374.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (410) 465-5520
- Email not available
Practice Locations
3355 SAINT JOHNS LN SUITE F
Ellicott City, MD 21042
Concerns and Conditions Addressed
Within Clinical Psychology generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
Abuse & trauma
Addiction
Anxiety
Behavioral
Child & adolescent
Cognitive
Dissociative
Eating & Body Image
Health & Pain
Identity
Interpersonal
Life transitions
Mood & Emotion
- Anger issues
- Bipolar disorder
- Illness anxiety disorder
- Panic disorder
- Postpartum depression
- Social anxiety disorder
- Specific phobias
Neurodevelopmental
Personal Growth
Personality
Self-harm & crisis
Sensory & neurological
Severe mental illness
Sleep
Stress & Lifestyle
Stress & lifestyle
Work & identity
Procedures & services
Most searched procedures
Assessments
Behavioral Interventions
- Acceptance and commitment therapy (ACT)
- Anger management
- Dialectical behavior therapy (DBT)
- Exposure and response prevention (ERP)
- Habit reversal training
- Prolonged exposure therapy
Brain-based therapies
Child & adolescent
Crisis & safety
Group Programs
Individual therapy
Interpersonal
Mind-Body
Parenting & Support
Psychodynamic & Integrative
- Internal family systems (IFS)
- Interpersonal psychotherapy
- Psychodynamic psychotherapy
- Schema Therapy
Relationship & family
Skill building
Sleep & Health
Specialized therapy
Stress & Lifestyle
Testing & evaluation
- ADHD Evaluation
- Bariatric Surgery Evaluation
- Emotional Support Animal Evaluation
- Forensic psychological evaluation
- Neuropsychological Testing
- Psychoeducational Testing
Therapy formats
Trauma therapy
Procedures Most Often Billed to Medicare
786 services · 71 patients · 3 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Psychotherapy, 1 hour | Treatment | 90837 |
424 | More often than most peers in Clinical Psychologist |
| Psychotherapy, 45 minutes | Treatment | 90834 |
321 | More often than most peers in Clinical Psychologist |
| Psychotherapy, 30 minutes | Treatment | 90832 |
41 | Less often than most peers in Clinical Psychologist |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other clinical psychologists at this location 2
Same specialty, same street address — most likely the same department or group.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other clinical psychologists in Ellicott City 6
Same specialty, same city.
More connections — 24 related providers in 3 groups
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
Class of 1993 at Other 8
Providers who graduated from the same medical school in the same year.
Also performs Psychotherapy, 1 hour 8
Providers in MD who bill this service to Medicare most often.
Common questions
What is Marianne O'Leary's specialty?
Marianne O'Leary is a clinical psychologist in Ellicott City, MD. That is the designation recorded for this NPI in the federal registry.
NPI registry
Where can I find Marianne O'Leary?
Marianne O'Leary is listed at 3355 Saint Johns Ln Suite F, Ellicott City, MD 21042. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Marianne O'Leary?
The number on file is (410) 465-5520. Contact the office directly to confirm availability and scheduling.
NPI registry
What is Marianne O'Leary's NPI number?
Marianne O'Leary's National Provider Identifier is 1720147374. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
What is Marianne O'Leary's education?
Marianne O'Leary attended Other, graduating in 1993. This comes from the CMS National Downloadable File.
CMS public data
How long has Marianne O'Leary been practicing?
Marianne O'Leary has 33 years experience. Calculated from a graduation year of 1993, reported in the CMS National Downloadable File.
CMS public data
What is Marianne O'Leary known for?
According to Medicare billing data, Marianne O'Leary provides treatments such as psychotherapy, 1 hour and psychotherapy, 45 minutes. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Marianne O'Leary confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Marianne O'Leary. If this is you, claiming it is free.
Guide.md
Guide.md listings do not constitute medical advice or an endorsement.