Endocrinologists specialise in hormones and metabolism: blood sugar, thyroid, weight, bones and glands. Below are 49 endocrinologists practising in California, across Los Angeles, San Francisco, San Diego, Torrance, Stanford and Sacramento, with what to bring and ask so your visit counts.
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Listings come from the CMS NPPES NPI Registry, the public federal record of licensed providers, checked October 2026. Being listed is not a recommendation or an endorsement, and we do not receive anything from these doctors. Call the office to confirm insurance, availability and that they are accepting new patients. In an emergency, call 911.
When to see an endocrinologist
Common reasons
Diabetes and prediabetes
Thyroid conditions
Weight and metabolic health
Bone density concerns
Hormone imbalances
Signs it may be time
Your blood sugar or thyroid labs are outside the range
Your primary care doctor referred you
You have symptoms like unexplained weight change, fatigue or feeling too hot or cold
You want specialist care for a long-term metabolic condition
How to get the most from your endocrinologist visit
1
Before: what to bring
A list of everything you take, including supplements, with how often
Your insurance card and photo ID
Recent lab results or imaging reports, if another clinician ordered them
Recent blood sugar, thyroid and other lab results
Glucose readings from a meter or monitor, if you use one
2
During: questions to ask
Which numbers should I watch, and what range are we aiming for?
How often should my labs be repeated?
What side effects should I report?
What lifestyle changes would make the biggest difference?
3
After: what to keep track of
Energy, appetite and how you feel after meals
Weight and sleep
Any side effects, in your own words, with dates
After your visit
Keep the plan going between appointments
Endocrine conditions change slowly, so the details between visits matter: how you felt, what changed, what side effects came and went. A clear log makes the next lab review a real conversation. Emerge Care, free to download on iPhone, is built for exactly that: tell it how you feel in your own words, get plain answers with the source behind every fact, and walk into your next endocrinologist appointment in California with a one-page summary and your questions ready.
Log symptoms and side effects by talking
Answers that name their source
One-page visit summary PDF
Health records stay on your iPhone
Emerge Care never diagnoses or replaces your doctor.
Questions
How do I find an endocrinologist in California?
This page lists 49 endocrinologists practising in California, including Los Angeles, San Francisco, San Diego, Torrance, Stanford and Sacramento, from the federal NPI Registry. Call the office to confirm they take your insurance and are accepting new patients.
Do I need a referral to see an endocrinologist in California?
It depends on your insurance plan, not the state. HMO plans usually need a referral from your primary care doctor; many PPO plans do not. Check with your plan before booking.
What should I bring to my first endocrinologist appointment?
A list of everything you take, including supplements, with how often; Your insurance card and photo ID; Recent lab results or imaging reports, if another clinician ordered them; Recent blood sugar, thyroid and other lab results; Glucose readings from a meter or monitor, if you use one.
Do I need to fast before an endocrinology appointment?
Only if your doctor ordered fasting labs. Ask the office when you book.
What is the difference between an endocrinologist and a primary care doctor for diabetes?
Many people manage diabetes with their primary care doctor. An endocrinologist adds specialist care when it is complex or hard to control.
