Physician Profile
Gemma Guillermo, M.D.
Unclaimed ProfileAbout Dr. Guillermo
Based in Redwood City, CA, Gemma Guillermo, M.D. is listed in the NPI registry under psychiatry. Gemma graduated from Js Weill Medical College, Cornell University in 1995. According to Medicare claims data, Gemma cared for 103 Medicare patients across 220 services.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Specialty
Credentials & Licensing
Source: NPPES NPI Registry
Contact Information
- (650) 367-5559
- Email not available
Practice Locations
170 ALAMEDA DE LAS PULGAS 1EAST, SEQUOIA HOSPITAL
Redwood City, CA 94062
Conditions Commonly Evaluated or Treated
Within Psychiatry 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
- ADHD
- Anxiety
- Bipolar disorder
- Depression
- Schizophrenia
- Trauma
Anxiety, trauma, and obsessive-compulsive
- Agoraphobia
- OCD
- Panic disorder
- Social anxiety disorder
- Specific phobias
Mood disorders
- Premenstrual dysphoric disorder
- Seasonal affective disorder
Psychotic disorders
- Schizoaffective disorder
Substance-related and addictive
- Alcohol use disorder
- Opioid use disorder
Addiction & Substance Use
- Drug addiction
- Gambling Addiction
Cognitive and adjustment
- Dementia with behavioral symptoms
- Prolonged grief disorder
Eating Disorders
- Binge eating
- Eating disorders
Eating, sleep, and somatic
- Illness anxiety disorder
Mood & Depression
- Postpartum depression
Neurodevelopmental and behavioral
- Autism
- Oppositional defiant disorder
Personality and dissociative
- Borderline personality disorder
- Dissociative disorders
- Narcissistic personality disorder
Sleep & Wakefulness
- Insomnia and Sleep Problems
Procedures & services
Most searched procedures
- Anxiety and depression treatment
- Cognitive behavioral therapy
- Medication management
- Psychiatric evaluation
- Telepsychiatry
Assessment
- Suicide and safety risk assessment
Addiction care
- Addiction counseling
Addiction Medicine
- Alcohol Detox and Withdrawal Management
- Dual Diagnosis Treatment
- Suboxone Treatment and MAT
Assessments
- Adult ADHD Testing
- Autism testing
- Cognitive Assessment
Brain stimulation
- Neurofeedback
- Vagus Nerve Stimulation
Consultations
- Psychiatric Second Opinion
Diagnostics
- Neuropsychological Testing
- Psychiatric Genetic Testing
Inpatient care
- Inpatient Psychiatric Care
Interventional psychiatry
- Spravato Treatment
Psychotherapy
- Anger Management Counseling
- Couples counseling
- EMDR Therapy
- Exposure and Response Prevention
Sleep Medicine
- Sleep counseling
Specialized care
- Light Therapy
Therapy
- Acceptance and commitment therapy
- Dialectical Behavior Therapy
- Somatic experiencing
Therapy and care
- Family therapy
- Group psychotherapy
- Supportive psychotherapy
Procedures Most Often Billed to Medicare
220 services · 103 patients · 5 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | Office visit | 99232 |
80 |
| Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes | Office visit | 99231 |
74 |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | Office visit | 99233 |
23 |
| Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | Office visit | 99223 |
23 |
| Hospital discharge day management, more than 30 minutes | Office visit | 99239 |
20 |
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.
Related specialists at this location 1
Clinically related specialties at the same address — the people this provider most likely works alongside.
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 psychiatry specialists in Redwood City 8
Same specialty, same city.
More connections — 16 related providers in 2 groups
Trained at Js Weill Medical College, Cornell University 8
Other providers in the same specialty who trained at the same institution.
Class of 1995 at Js Weill Medical College, Cornell University 8
Providers who graduated from the same medical school in the same year.
Common questions
What is Gemma Guillermo's specialty?
Gemma Guillermo is a psychiatry in Redwood City, CA. That is the designation recorded for this NPI in the federal registry.
NPI registry
Where can I find Gemma Guillermo?
Gemma Guillermo is listed at 170 Alameda de Las Pulgas 1East, Sequoia Hospital, Redwood City, CA 94062. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Gemma Guillermo?
The number on file is (650) 367-5559. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Gemma Guillermo's NPI number?
Gemma Guillermo's National Provider Identifier is 1831154418. 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 Gemma Guillermo's education?
Gemma Guillermo attended Js Weill Medical College, Cornell University, graduating in 1995. This comes from the CMS National Downloadable File.
CMS public data
How long has Gemma Guillermo been practicing?
Gemma Guillermo has 31 years experience. Calculated from a graduation year of 1995, reported in the CMS National Downloadable File.
CMS public data
What is Gemma Guillermo known for?
According to Medicare billing data, Gemma Guillermo the Medicare record under this individual NPI shows mainly office visits and diagnostic testing. Hospital-based physicians usually have their procedural work billed by the facility rather than under their own number, so this is a floor on their practice, not a description of it. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Gemma Guillermo confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Gemma Guillermo. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.