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- NPI Number
- 1376527366
- Provider Type
- Individual Practitioner
- Credential
- M.D.
- Primary Specialty
- Pediatrics - Adolescent Medicine
- License Number
- 0101238865
- Practice Address
- 3650 Joseph Siewick DR, Suite 101
- City, State ZIP
- Fairfax, VA 22033
- Phone
- (703) 391-0900
- Last Updated
- June 8, 2026
- Source
- Publicly available data
John Tsai, M.D. is a pediatrics - adolescent medicine provider located in Fairfax, VA. They offer pediatrics - adolescent medicine services to patients in the Fairfax area.
As a pediatrics - adolescent medicine provider in Fairfax, this clinician evaluates and treats patients for a range of common conditions seen in Fairfax and throughout VA.
The practice is located at 3650 Joseph Siewick DR, Suite 101, Fairfax, VA 22033. Patients can call 7033910900 to schedule an appointment or use the directions link above to find the office from anywhere in the area.
Patients typically visit this provider for common reasons for pediatric visits include well-child checkups, vaccinations, developmental assessments, treatment of common childhood illnesses, and behavioral or school-related concerns.
If you plan to see this provider, it is a good idea to confirm that the practice accepts your insurance and is in-network before scheduling. Coverage details vary by plan, and our quote tool can help you compare options in VA.
This profile was last verified on June 8, 2026. Provider information is sourced from publicly available data and may not reflect recent changes. Please confirm details directly with the practice before scheduling.
Call for hours and appointments. Hours may vary by provider and location.
A patient’s guide to pediatrics - adolescent medicine care in Fairfax, VA.
What a Pediatrics - Adolescent Medicine provider does
Pediatric providers specialize in the health and medical care of infants, children, and adolescents. They monitor growth and development, administer vaccinations, and treat acute and chronic childhood illnesses.
Common conditions treated
Common conditions include ear infections, strep throat, RSV and other respiratory viruses, asthma, eczema, ADHD, childhood obesity, and behavioral concerns. Pediatric providers also treat minor injuries and provide developmental screenings.
Common reasons to schedule a visit
Common reasons for pediatric visits include well-child checkups, vaccinations, developmental assessments, treatment of common childhood illnesses, and behavioral or school-related concerns.
What to expect during a visit
Well-child visits track growth, milestones, and immunizations on a recommended schedule. Bring questions about feeding, sleep, behavior, or development to each appointment.
Insurance coverage considerations
Pediatric care is typically covered under family or child-only health plans, often with no-cost preventive services. Compare plans in your state to find affordable coverage for your child.
How to choose the right pediatrics - adolescent medicine provider in Fairfax
Look for a pediatric provider with a child-friendly office, after-hours phone support, and same-day sick visits when possible. The right pediatrician will partner with parents and answer questions patiently through every stage of development.
Looking for in-network coverage that includes this pediatrics - adolescent medicine provider? Compare health plans in VA →
Insurance acceptance not listed
The public NPI registry does not include insurance acceptance data. Contact the office directly to ask if they accept your insurance plan. You can also use our quote tool to find health plans in VA.
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Common questions about John Tsai, M.D. in Fairfax, VA.
How do I make an appointment with John Tsai, M.D.?
Call John Tsai, M.D. directly at their Fairfax office to schedule a visit. You can also use the contact form on this page to send a message and the practice will respond.
Does John Tsai, M.D. accept insurance?
Provider insurance information is not included in the public NPI registry data that powers this directory. Contact the office directly to ask whether they accept your specific insurance plan. You can also use our quote tool to find health plans in VA.
What are the office hours for John Tsai, M.D. in Fairfax?
Office hours for John Tsai, M.D. in Fairfax are not currently published. Call the practice directly to confirm hours before your visit.
Is parking available at John Tsai, M.D.'s Fairfax location?
Most provider offices in Fairfax offer on-site or nearby street parking. Call John Tsai, M.D. in Fairfax ahead of time to confirm parking options and accessibility accommodations.
Does John Tsai, M.D. offer telehealth?
Many pediatrics - adolescent medicine providers in VA now offer telehealth visits for follow-ups, medication management, and routine consultations. Call John Tsai, M.D. to ask whether a telehealth visit is appropriate for your needs.
What ages of patients does John Tsai, M.D. see?
Pediatric providers typically see patients from newborns through age 18. Call John Tsai, M.D. in Fairfax to confirm the age range currently accepted.
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Claim ProfileData is sourced from publicly available records. Public records do not confirm active license status, quality of care, insurance acceptance, or network participation. Please verify details directly with the provider before scheduling. Last updated June 8, 2026.