About Dr. Cassandra Os
Focus areas
Anxiety
Depression
Psychiatry Consultation
Attention-Deficit / Hyperactivity Disorder (ADHD)
Medication Management
Women's Mental Health Issues
Cognitive Behavioral Therapy (CBT)
Obsessive Compulsive Disorder (OCD)
Clientele seen
Young adults (18-24)
Individuals
Adults (25-64)
Seniors (65+)
Treatment approaches
Acceptance and Commitment (ACT)
Exposure Response Prevention
Cognitive Behavioral (CBT)
Interpersonal
Coaching
Person-Centered
Identity
Gender
FemaleEthnicity
White
Languages spoken
English
Getting to know Dr. Cassandra Os
I’m a dual board-certified Psychiatric Mental Health Nurse Practitioner (PMHNP-BC) and Acute Care Adult Gerontology Nurse Practitioner (ACNPC-AG) providing psychiatric care and medication management for adults in Massachusetts and New Hampshire.
I specialize in ADHD, anxiety, depression, stress, burnout, sleep concerns, and women’s mental health. I have a particular interest in helping women and busy adults who may have spent years feeling overwhelmed, anxious, distracted, or simply not like themselves.
My background in both psychiatric and medical care allows me to look beyond symptoms alone and consider the whole picture—including medical history, medications, sleep, lifestyle, and other factors that may affect mental health.
Treatment may include psychiatric evaluation, medication management, supportive psychotherapy, education, and lifestyle-based strategies. My approach is warm, collaborative, and evidence-based. My goal is for you to leave appointments feeling heard, informed, and comfortable with your treatment plan.
I am currently accepting new adult patients for virtual psychiatric appointments in Massachusetts and New Hampshire.
What should a new client know about working with you?
You don’t need to have everything figured out before your first appointment. Whether you’re wondering if you may have ADHD, struggling with anxiety or depression, feeling overwhelmed or burned out, or looking for help with psychiatric medication management, we’ll start by talking about what you’re experiencing and what you’d like to feel differently.
My approach is warm, collaborative, and down-to-earth. I want you to feel heard and comfortable asking questions without feeling rushed or judged. I have a particular interest in adult ADHD and women’s mental health, including the ways ADHD, anxiety, mood symptoms, stress, sleep, and life demands can overlap.
I take a whole-person approach to psychiatric care. My background in both mental health and medical care allows me to consider your psychiatric symptoms alongside your medical history, current medications, sleep, lifestyle, and overall health.
Together, we’ll develop an individualized treatment plan that may include medication management, supportive psychotherapy, education, and practical strategies. My goal is for you to understand your diagnosis and treatment options and feel like an active participant in your care.
What is your typical process for working with clients?
Your first appointment is a comprehensive psychiatric evaluation focused on understanding what brought you to care and developing a clear, personalized plan for what comes next.
We’ll review your current concerns, psychiatric and medical history, medications, previous treatments, sleep, lifestyle, and how your symptoms are affecting everyday life. If you’re seeking an ADHD evaluation, we’ll explore attention, focus, organization, impulsivity, childhood history, and how these symptoms impact you at home, work, school, and in relationships. We’ll also consider other conditions, such as anxiety, depression, sleep difficulties, or medical factors, that can cause or worsen similar symptoms.
If medication is appropriate, we’ll review your options together, including potential benefits, side effects, alternatives, and what to expect from treatment. I believe medication decisions should be collaborative—you should understand why a treatment is being recommended and feel comfortable with the plan.
Follow-up appointments focus on your progress, medication effectiveness and tolerability, symptom improvement, and any changes needed along the way. Treatment may also incorporate supportive psychotherapy, education, and practical strategies based on your individual needs and goals.
My goal is to make psychiatric care feel approachable, thorough, and straightforward while helping you find a treatment plan that works for your life.
Is this doctor in your insurance network?
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In-network insurances
Aetna
BlueCross BlueShield
Cigna
Out-of-pocket fees and assistance
Initial session: $200 for 60 minutes
Ongoing session: $160 for 45 minutes
Education and background
Practice names
Education and training
- College of Our Lady of the Elms, Doctor of Nursing Practice
- Liberty University, Post-Master's Certificate in Psychiatric and Mental Health Nursing
NPI number
1285258863
How soon can I make an appointment with Dr. Cassandra Os?
Generally, Dr. Cassandra Os has appointments available on Zocdoc within 1 week. You can see Dr. Os's earliest availability on Zocdoc and make an appointment online.
Is Dr. Cassandra Os accepting new patients?
Dr. Cassandra Os generally accepts new patients on Zocdoc. You can see Dr. Os's earliest availability on Zocdoc and schedule an appointment online.
Does Dr. Cassandra Os accept my insurance?
Choose your insurance plan to verify if Dr. Os is in-network.
Can I make an appointment with Dr. Cassandra Os online?
Yes, you can make an appointment online with Dr. Os using Zocdoc. It’s simple, secure, and free.
What practice does Dr. Cassandra Os work with?
Dr. Cassandra Os works with Wildflower Mind & Medicine.
What are common reasons for patients to see Dr. Cassandra Os?
Dr. Cassandra Os frequently sees patients for Psychiatry Consultation, Psychotherapy, Psychotherapy Intake / Initial Visit, Sleep Problems, and Weight Loss Consultation. You can see other visit reasons for Dr. Cassandra Os on their profile.
What languages does Dr. Cassandra Os speak?
Dr. Cassandra Os speaks English.