William Lang, M.D.
Compare health plans in CA
Find coverage options that include this provider in-network and fit your budget.
- NPI Number
- 1326445065
- Provider Type
- Individual Practitioner
- Credential
- M.D.
- Primary Specialty
- Other Service Providers - Research Study Specialist
- License Number
- G037379
- Practice Address
- 101 Cornelia AVE
- City, State ZIP
- Mill Valley, CA 94941
- Phone
- (415) 755-8841
- Last Updated
- June 8, 2026
- Source
- Publicly available data
William Lang, M.D. is a other service providers - research study specialist provider located in Mill Valley, CA. They offer other service providers - research study specialist services to patients in the Mill Valley area.
As a other service providers - research study specialist provider in Mill Valley, this clinician evaluates and treats patients for a range of common conditions seen in Mill Valley and throughout CA.
The practice is located at 101 Cornelia AVE, Mill Valley, CA 94941. Patients can call 4157558841 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 to schedule a visit include annual checkups, new or worsening symptoms, medication refills, lab work, preventive screenings, chronic condition management, and second opinions.
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 CA.
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 other service providers - research study specialist care in Mill Valley, CA.
What a Other Service Providers - Research Study Specialist provider does
Healthcare providers diagnose, treat, and help prevent illness and injury. They work with patients to manage ongoing conditions, interpret test results, prescribe medications when appropriate, and coordinate care with other specialists. Most providers accept both insured and self-pay patients, and many offer telehealth visits for routine concerns.
Common conditions treated
Common conditions evaluated include high blood pressure, diabetes, respiratory infections, allergies, skin conditions, digestive complaints, headaches, and musculoskeletal pain. Providers also handle preventive screenings and routine lab work.
Common reasons to schedule a visit
Common reasons to schedule a visit include annual checkups, new or worsening symptoms, medication refills, lab work, preventive screenings, chronic condition management, and second opinions.
What to expect during a visit
During a typical visit, the provider will review your medical history, ask about current concerns, perform a relevant examination, and recommend next steps such as lifestyle changes, prescriptions, additional testing, or specialist referrals. Bring a list of current medications, recent test results, and questions you would like answered.
Insurance coverage considerations
Most major insurance plans cover preventive care and medically necessary visits, but copays, deductibles, and network restrictions vary. Contact your insurance carrier or use our quote tool to confirm a provider is in-network before scheduling.
How to choose the right other service providers - research study specialist provider in Mill Valley
When choosing a healthcare provider, look for board certification, convenient location and hours, accepted insurance plans, and a communication style that fits your preferences. Patient reviews and hospital affiliations can also help you make a confident decision.
Looking for in-network coverage that includes this other service providers - research study specialist provider? Compare health plans in CA →
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 CA.
Explore more healthcare options in and around Mill Valley, CA.
Common questions about William Lang, M.D. in Mill Valley, CA.
How do I make an appointment with William Lang, M.D.?
Call William Lang, M.D. directly at their Mill Valley 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 William Lang, 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 CA.
What are the office hours for William Lang, M.D. in Mill Valley?
Office hours for William Lang, M.D. in Mill Valley are not currently published. Call the practice directly to confirm hours before your visit.
Is parking available at William Lang, M.D.'s Mill Valley location?
Most provider offices in Mill Valley offer on-site or nearby street parking. Call William Lang, M.D. in Mill Valley ahead of time to confirm parking options and accessibility accommodations.
Does William Lang, M.D. accept walk-in appointments?
Walk-in availability for other service providers - research study specialist providers varies by location and day. Call ahead to confirm same-day availability before visiting.
Claim this profile to add photos, services, office hours, and respond to patient inquiries.
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.