Before you start

California residence
Income information for subsidy or Medi-Cal eligibility
An SSN or ITIN for the marketplace application
A qualifying life event, if enrolling outside Covered California's own open-enrolment window

Step-by-step

1
Enrol in your employer's plan within the new-hire window
Typically 30 days from your start date, and missing it usually means waiting for the next open enrolment. Compare the deductible and the out-of-pocket maximum, not just the premium — and in California check whether the plan is an HMO tied to a specific medical group, which is very common here and restricts where you can be seen.
Via employerWho: YouFirst 30 days of employment
2
Use Covered California, not HealthCare.gov
California runs its own exchange with its own open-enrolment dates, which have historically run longer than the federal window. Do not apply the federal calendar. Moving to California is itself a qualifying life event for a special enrolment period — use it on arrival rather than waiting for the annual window.
OnlineWho: You
3
Know that California has its own individual mandate
California reinstated an individual coverage requirement with a state penalty collected through the Franchise Tax Board. Being uninsured here therefore has a direct tax cost that it does not have in most states. Exemptions exist; check the Franchise Tax Board's own page rather than assuming.
OnlineWho: You
4
Check Medi-Cal eligibility — and check the current immigration rules
Medi-Cal is the deepest Medicaid programme in the United States. From 1 January 2026 new full-scope enrolment is frozen for adults with unsatisfactory immigration status; people enrolled by 31 December 2025 retain coverage, children can still enrol, and new adult applicants in that category are limited to restricted-scope emergency and pregnancy Medi-Cal. Premiums have been introduced for some enrolled adults. This has changed more than once and may change again — read the Department of Health Care Services' current guidance and take advice before acting on any summary, including this one.
OnlineWho: You
5
In Orange County, Medi-Cal means CalOptima
CalOptima Health is the county-organised health system that delivers Medi-Cal in Orange County. If you or a household member qualifies, this is the organisation you will actually deal with, and choosing the right network within it matters.
OnlineWho: You
6
Register with a primary care physician in month one
Do it while you are well. In California's HMO-heavy market you frequently have to nominate a primary care physician and a medical group before you can be referred anywhere, and changing later means a form and a wait. Confirm the practice is in your plan's network before the first visit.
In personWho: YouMonth 1
7
Understand the wildfire and air-quality layer
Autumn Santa Ana winds drive Southern California's fire season and smoke events affect air quality across the basin even when the fire is far away. If anyone in the household has asthma or a cardiac condition, follow the South Coast air quality advisories, keep a supply of well-fitting filtering masks, and consider a HEPA filter for the bedroom. This is ordinary local household practice here.
OnlineWho: You
8
Learn the urgent care versus emergency room distinction
An emergency room visit for something a clinic could treat costs thousands even when insured, and California's balance-billing protections do not cover every scenario. Urgent care handles fractures, stitches and infections far more cheaply, and Irvine has plenty of it.
In personWho: You

Documents you’ll need

Proof of California residence
Income documentation for subsidies or Medi-Cal
SSN or ITIN
Immigration documents for eligibility categories
Evidence of losing prior coverage, if using a special enrolment period

Things most newcomers don’t know

California runs its own marketplace with its own dates. Applying the federal calendar can cost you a year.

Covered California is not HealthCare.gov and its open-enrolment window has historically been longer than the federal one. Newcomers read a national article, use the federal dates, and either miss the window or believe they have missed it when they have not. Check Covered California's own calendar, and remember that moving to the state is itself a qualifying event.

Source: Covered California

Being uninsured in California has a tax cost.

California reinstated an individual mandate with a state penalty collected by the Franchise Tax Board after the federal penalty was zeroed out. In Texas there is no equivalent. It changes the arithmetic on going without cover for a few months between jobs.

Source: California Franchise Tax Board — health care mandate

The Medi-Cal immigration rules changed on 1 January 2026 and are still moving.

California was the only state to extend full-scope Medicaid to all income-eligible adults regardless of immigration status; the 2025-26 budget froze new adult enrolment for those with unsatisfactory immigration status and added premiums for some existing enrollees. Children can still enrol and existing adult enrollees keep coverage. Because this is budget policy rather than settled law it has moved repeatedly — treat any written summary as a starting point and confirm with DHCS.

Source: California Department of Health Care Services

California's HMO market means you pick a medical group, not just a plan.

A very large share of California employer coverage is HMO, where you nominate a primary care physician and are effectively assigned to their medical group for referrals. Choosing the plan is only half the decision; choosing a group with the specialists and hospitals you want is the other half, and changing it later is slower than people expect.

Source: community-reported

Common mistakes to avoid

Using HealthCare.gov's dates when California runs its own exchange with its own calendar.
Assuming there is no penalty for going uninsured — California has a state mandate.
Relying on a written summary of the Medi-Cal immigration rules rather than checking DHCS.
Missing the 30-day new-hire enrolment window at a new employer.
Choosing an HMO plan without checking which medical group and hospitals it ties you to.
Ignoring smoke advisories during Santa Ana fire season if anyone has asthma.

Some of this may be out of date. Spotted something inaccurate? Help us keep it right for the next newcomer.