WJ
Accepting patients
Affiliated with a Castle Connolly Top Hospital
Who is Dr. Johnston, Emergency Medicine Specialist in San Mateo, CA?
Dr. William Johnston, MD is an Emergency Medicine Specialist, who primarily practices in San Mateo, CA with 1 additional practice location. Dr. Johnston is fluent in English, and is currently seeing new patients. Dr. Johnston’s practice accepts Kaiser Permanente, Medicare, UnitedHealthcare and other major insurance plans. To book an appointment or to confirm insurance options, please call Dr. Johnston’s office at (650) 493-5000.
What languages does Dr. Johnston speak?
Dr. Johnston and their clinical team can communicate with patients in the following languages:
English
What conditions does Dr. Johnston treat?
As an Emergency Medicine Specialist, Dr. Johnston diagnoses, treats, and manages a wide range of conditions. This condition information is derived from anonymized insurance claims and highlights the medical conditions most commonly treated by Dr. Johnston. It provides insight into the doctor’s areas of experience and expertise based on real-world patient encounters from the past two years, updated quarterly.
Also known as:
- Upper Middle Abdominal Pain
- Abdominal Pain
- Widespread Abdominal Pain
- Epigastric pain
- Pain below breastbone
- Upper stomach pain
- Stomach Ache
- Belly Pain
- Stomach Pain
- General stomach pain
- Overall belly pain
- Diffuse abdominal pain
ICD-10 Codes:
- R1013: Epigastric pain
- R109: Unspecified abdominal pain
- R1084: Generalized abdominal pain
Also known as:
- Chest Pain
- Chest discomfort
- Thoracic pain
- Upper body pain
ICD-10 Codes:
- R079: Chest pain, unspecified
Also known as:
- Common Cold
- Upper Respiratory Infection
- Head Cold
- Cold Symptoms
ICD-10 Codes:
- J069: Acute upper respiratory infection, unspecified
Also known as:
- Headache
- Head pain
- Cephalalgia
- Tension headache
ICD-10 Codes:
- R519: Headache, unspecified
Also known as:
- Flu with Respiratory Symptoms
- Flu
- Influenza with Breathing Problems
- Flu with Cough
- Severe Flu
ICD-10 Codes:
- J101: Influenza due to other identified influenza virus with other respiratory manifestations
Also known as:
- Urinary Tract Infection
- UTI
- Bladder infection
- Kidney infection
- Urine infection
ICD-10 Codes:
- N390: Urinary tract infection, site not specified
Also known as:
- Low Back Pain
- Back Pain
- Lumbago
- Lower Back Ache
- Backache
ICD-10 Codes:
- M5450: Low back pain, unspecified
Also known as:
- COVID-19
- COVID-19 (Coronavirus Disease 2019)
- Coronavirus Disease 2019
- SARS-CoV-2 Infection
- Novel Coronavirus
ICD-10 Codes:
- U071: COVID-19
Also known as:
- Skin Rash
- Rashes
- Skin Eruption
- Hives
- Dermatitis
- Skin Inflammation
ICD-10 Codes:
- R21: Rash and other nonspecific skin eruption
Also known as:
- Other Tooth Problems
- Tooth Disorder
- Dental Issues
- Tooth Ailments
- Oral Health Problems
ICD-10 Codes:
- K0889: Other specified disorders of teeth and supporting structures
Also known as:
- Chest Pain
- Chest discomfort
- Thoracic pain
- Pectoral pain
ICD-10 Codes:
- R0789: Other chest pain
Also known as:
- High Blood Pressure
- Hypertension
- Primary Hypertension
- Essential Hypertension
ICD-10 Codes:
- I10: Essential (primary) hypertension
Also known as:
- Dizziness
- Dizziness and Vertigo
- Lightheadedness
- Giddiness
- Vertigo
ICD-10 Codes:
- R42: Dizziness and giddiness
Also known as:
- Cough
- Coughing
- Persistent cough
- Chronic cough
ICD-10 Codes:
- R059: Cough, unspecified
Also known as:
- Sore Throat
- Acute pharyngitis
- Throat inflammation
- Acute throat infection
ICD-10 Codes:
- J029: Acute pharyngitis, unspecified
Also known as:
- Viral Infection
- Virus Infection
- Viral Illness
- Common Virus
ICD-10 Codes:
- B349: Viral infection, unspecified
Also known as:
- Nausea and Vomiting
- Feeling Sick and Throwing Up
- Stomach Flu Symptoms
- Queasy and Vomiting
ICD-10 Codes:
- R112: Nausea with vomiting, unspecified
Also known as:
- Pneumonia
- Lung Infection
- Chest Infection
- Pneumonitis
ICD-10 Codes:
- J189: Pneumonia, unspecified organism
Which procedures does Dr. Johnston perform as an Emergency Medicine Specialist?
As an Emergency Medicine Specialist, procedures performed by Dr. William Johnston may include:
- Emergency Consultation
- Emergency Follow Up
- Emergency Medicine Consultation
- Removal of Foreign Object from Body
- Urgent Care Consultation
- Urgent Care Follow Up
For detailed information, please contact Dr. Johnston's office.
Does Dr. Johnston accept my insurance?
Dr. Johnston accepts most major insurance plans. Important: Please call our office at (650) 493-5000 before your appointment to verify that your specific plan and network are accepted.
What insurance plans does Dr. Johnston accept in San Mateo, CA?
Dr. Johnston in San Mateo, CA accepts plans from many carriers. While this list is updated regularly, it is not a guarantee of coverage.
Top Insurances
Blue Shield of California
Crown Cork and Seal Company
CVS Health (formerly Aetna)
Health Plan of San Mateo
Kaiser Permanente
Medicare
Neighborhood Health Plan (RI)
San Francisco Health Plan
State of Tennessee
Sutter Health
View All Insurances
Where is Dr. Johnston's office located?
Dr. William Johnston's Primary Practice
222 W 39th Ave
San Mateo, CA 94403
(650) 493-5000
What is Dr. Johnston's NPI number?An National Provider Identifier (NPI) is a unique ID number that identifies doctors and healthcare providers nationwide.
Dr. Johnston's National Provider Identifier (NPI) number is 1417366584.
What common questions do patients ask about Dr. Johnston?
Here are answers to patients Frequently Asked Questions (FAQ’s) about Dr. Johnston
What is Dr. William Johnston's specialty?
Dr. Johnston is a Emergency Medicine Specialist near San Mateo, CA. An emergency physician is dedicated to making prompt decision and taking necessary actions essential for preventing death or additional disabilities. This role encompasses guiding emergency medical technicians in pre-hospital environments as well as providing care within the emergency department. The emergency physician is responsible for the immediate identification, evaluation, treatment, stabilization, and arrangement of a diverse array of adult and pediatric patients facing acute illnesses and injuries. Contact Dr. Johnston to book an appointment today.
Is this Dr. William Johnston affiliated with a ranked Castle Connolly Top Hospital?
Yes, Dr. Johnston is affiliated with San Mateo Medical Center, Stanford Health Care - Stanford Hospital, Mills-Peninsula Medical Center, AHMC Seton Medical Center, Kaiser Permanente South San Francisco Medical Center, UCSF Health Saint Francis Hospital which are a Castle Connolly Top Hospitals. Castle Connolly Top Hospitals are healthcare institutions recognized for their excellence in specific medical procedures and overall patient care. They are identified through a rigorous peer nomination process, evaluating factors like patient outcomes, quality of care, and expertise. The list recognizes hospitals that excel in 20 or more specific medical procedures, representing the top 25% nationwide. Castle Connolly Top Hospitals
Where can I learn more about Emergency Medicine Specialist?
Explore Emergency Medicine Specialist with insights from trusted medical experts on EverydayHealth.com, where you'll find the most relevant content and helpful condition guides for up-to date information about symptoms, causes, diagnosis, treatment and more. See all our health guides to find trusted information on medical conditions from our experts at Everyday Health.
Is William Johnston accepting new patients in San Mateo, CA?
Yes, Dr. William Johnston is accepting new patients at this time.
Does Dr. William Johnston offer online booking?
Please contact Dr. Johnston's office at (650) 493-5000 for information about online booking, telehealth, or to schedule an appointment.
How can I make an appointment with William Johnston?
Please contact Dr. Johnston's office at (650) 493-5000 for information regarding telehealth appointment availability or for scheduling assistance.
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