Are you Gemma Guillermo, M.D.? This profile is yours to edit: update your address, phone, photo and services.
Edit this profileAt a glance
- 170 Alameda de Las Pulgas, 1East, Sequoia Hospital, Redwood City, CA 94062
About 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. The services billed most often include subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes, subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes, and subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes. NPI 1831154418 identifies this record in the national registry.
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
- (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
Anxiety, trauma, and obsessive-compulsive
Mood disorders
Psychotic disorders
Substance-related and addictive
Addiction & Substance Use
Cognitive and adjustment
Eating Disorders
Eating, sleep, and somatic
Mood & Depression
Neurodevelopmental and behavioral
Personality and dissociative
Sleep & Wakefulness
Procedures & services
Most searched procedures
- Anxiety and depression treatment
- Cognitive behavioral therapy
- Medication management
- Psychiatric evaluation
- Telepsychiatry
Assessment
Addiction care
Addiction Medicine
Assessments
Brain stimulation
Consultations
Diagnostics
Inpatient care
Interventional psychiatry
Psychotherapy
Sleep Medicine
Specialized care
Therapy
Therapy and care
Procedures Most Often Billed to Medicare
220 services · 103 patients · 5 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | Office visit | 99232 |
80 | As often as other peers in Psychiatry |
| 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 | As often as other peers in Psychiatry |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | Office visit | 99233 |
23 | Less often than most peers in Psychiatry |
| Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | Office visit | 99223 |
23 | As often as other peers in Psychiatry |
| Hospital discharge day management, more than 30 minutes | Office visit | 99239 |
20 | As often as other peers in Psychiatry |
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 psychiatrists 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 psychiatrist in Redwood City, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Psychiatry”.
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. Contact the office directly to confirm availability and scheduling.
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
Guide.md listings do not constitute medical advice or an endorsement.