Is Valley Fever Covered by Workers' Comp in California?

Is Valley Fever a Work Injury in California?

Yes. California workers' comp treats Valley Fever like any other work injury. If your job exposed you to the fungus that causes it, your claim is covered under the state's no-fault rule.

Valley Fever is the common name for coccidioidomycosis, an infection caused by a fungus that lives in soil in parts of California. People get sick by breathing in fungal spores released when dirt or dust is disturbed. Labor Code section 3600 makes an employer responsible for a work injury without regard to negligence, and Labor Code section 3208 says an "injury" includes a disease arising out of the employment. Together, these rules mean you do not have to prove your employer did anything wrong, only that your job was the source of your exposure.

California decides these claims on a preponderance of the evidence, the same standard used in every workers' comp case, set by Labor Code section 3202.5. Your medical and work evidence only has to show your job exposure is more likely than not the cause, not rule out every other possibility.

Valley Fever often takes one to three weeks to cause symptoms, and longer to diagnose. California files it, for deadline purposes, like any other occupational disease.

How Do You Prove You Caught Valley Fever at Work?

You prove a Valley Fever claim with a diagnosis, medical records, and facts about your job that show you were around dust or disturbed soil before you got sick.

Start with a diagnosis. A doctor usually confirms Valley Fever with a blood test, since early symptoms such as cough, fever, chest pain, and tiredness look like many other illnesses. Keep every lab result and doctor's note.

Next, connect the diagnosis to your job: your duties, how often you worked outdoors, whether you dug, graded, or moved soil, how dusty your site was, and when symptoms began. A coworker who saw the same conditions can help too.

You do not need to rule out every other possible source. Under the preponderance standard above, the only question is whether work was the more likely cause.

Which Jobs Carry the Most Valley Fever Risk?

Any outdoor job that disturbs dirt or soil carries Valley Fever risk. California law singles out construction work in high-risk counties for required training.

The state health department lists construction, agriculture, wildland firefighting, field work, excavation, landscaping, and archaeology as jobs where workers disturb soil and risk breathing in the fungus. Reported cases have climbed for years, mostly in the Central Valley and Central Coast regions.

• Digging, grading, or trenching.
• Operating heavy equipment on disturbed ground.
• Driving on dirt or unpaved roads.
• Working outdoors in high winds or dusty conditions.
• Agricultural field work and landscaping.
• Wildland firefighting that involves moving soil.

Valley Fever is caused by a microscopic fungus known as Coccidioides immitis, which lives in the top 2 to 12 inches of soil in many parts of the state. When soil is disturbed by activities such as digging, grading, or driving, or is disturbed by environmental conditions such as high winds, fungal spores can become airborne and can potentially be inhaled.

Labor Code section 6709 requires construction employers at worksites in high-rate counties, generally more than 20 cases per 100,000 people a year, to train workers every year on how the disease spreads, and again before any job expected to raise visible dust for an hour or more. That list of covered counties can change over time. Outside construction, the no-fault rule above still covers any worker in any industry whose job exposed them to the fungus.

Some people risk more severe illness once infected: those 60 or older, Black or Filipino, pregnant, diabetic, or with a weakened immune system, per the state health department. This does not change coverage, only how much treatment a case may need.

What Medical Care Does Workers' Comp Cover for Valley Fever?

Workers' comp pays for all reasonably needed treatment for a covered Valley Fever infection, starting with your primary treating physician and subject to utilization review.

Labor Code section 4600 requires your employer to pay for medical care reasonably needed to cure or relieve your Valley Fever infection. This includes doctor visits, lab tests, medication, and hospital care if the infection spreads. Most employers direct this care through an approved doctor list called a Medical Provider Network, or MPN. Your main doctor inside that network is your primary treating physician, or PTP. Without an MPN or a named doctor, you may choose your own doctor 30 days after you report the injury.

Before certain treatment is approved, the insurer can send your doctor's request through utilization review, or UR, under Labor Code section 4610. A reviewer checks whether the care is medically necessary. The reviewer can approve, change, or deny it. If UR denies or changes a request, you can ask for independent medical review, or IMR. You generally have 30 days from the denial to do this, or 10 days for a drug formulary dispute, under Labor Code section 4610.5. A different doctor then makes a final decision on the paperwork.

Step	What happens	Your deadline
Treatment request	Your doctor asks the insurer to approve care	None
Utilization Review	A reviewer approves, modifies, or denies it	Days
Denied	You request Independent Medical Review	30 days to appeal
IMR decision	A neutral doctor decides on the records	Final and binding

What Does Workers' Comp Pay While You Are Off Work With Valley Fever?

If Valley Fever keeps you off work, temporary disability pays about two-thirds of your average wage, up to a state maximum, for as long as you are recovering.

Temporary disability, or TD, replaces part of your lost income while a doctor says you cannot work, or can only work with restrictions your employer cannot accommodate. For injuries on or after January 1, 2008, including occupational disease, Labor Code section 4656 caps TD at 104 weeks within five years of your date of injury. The same section instead allows up to 240 weeks within five years for a short list of conditions that includes chronic lung disease, so a severe case that leaves lasting lung damage may fall under that longer limit.

Valley Fever can clear up in weeks, linger for months, or in rare cases spread beyond the lungs and need long-term care. Your own recovery, not a fixed number, decides how long TD runs within that cap.

How Is a Valley Fever Claim Rated, and What Is It Worth at Settlement?

There is no official average settlement for Valley Fever. Value depends on your permanent disability rating, your wages, any apportionment, and the medical care you are likely to still need.

If Valley Fever leaves you with lasting breathing problems once your condition is medically stable, a doctor rates your permanent disability, or PD. For injuries on or after January 1, 2013, Labor Code section 4660.1 rates PD using the American Medical Association's Guides to the Evaluation of Permanent Impairment, Fifth Edition. The rating is adjusted by a set factor. It then sets how many weeks of benefits you receive.

PD rating	Benefit weeks	Award at the 2026 max ($290/wk)
10 percent	30 weeks	$8,700
20 percent	75 weeks	$21,750
30 percent	130 weeks	$37,700
40 percent	200 weeks	$58,000
50 percent	270 weeks	$78,300
60 percent	350 weeks	$101,500
70 percent	430 weeks	$124,700 plus a life pension

Other facts move a settlement beyond the PD rating. Your average wage sets your weekly rate. Apportionment under Labor Code section 4663 can lower an award if part of your disability came from a cause other than this job, such as an earlier lung condition. Future medical care you are likely to need can also change the total, and so can whether you settle that care or keep your right to it. No one can state a settlement figure before your case is rated and reviewed.

What Is the Deadline to File a Valley Fever Claim?

You generally have 30 days to report a Valley Fever diagnosis to your employer, and one year to file a claim, both counted from your legal date of injury.

Labor Code section 5400 requires written notice to your employer within 30 days of the injury. Labor Code section 5405 then gives you one year to file a claim for benefits. For most injuries, both clocks start the day you got hurt. Valley Fever is different, since symptoms often take one to three weeks to appear and diagnosis can take longer.

For an occupational disease like Valley Fever, Labor Code section 5412 sets your date of injury. That date is the day you first lost time or needed care, and either knew, or reasonably should have known, that work caused it. Your 30 day notice and one year filing clocks both run from that discovery date, not from the day you breathed in the fungus. If more than one job exposed you to dust before that date, Labor Code section 5500.5 decides which employer, or employers, carries the liability.

Step	Deadline	Law
Report injury to your employer	Within 30 days	Labor Code 5400
File your workers' comp claim	Within 1 year	Labor Code 5405
Insurer must accept or deny	Within 90 days	Labor Code 5402
First disability check	Within 14 days	Labor Code 4650
Appeal a denied treatment	Within 30 days	Labor Code 4610.5

What if the Insurer Says You Caught It at Home?

An insurer can dispute where you were exposed, but it must weigh the evidence the way a judge would. A denial is not the end of your claim.

Insurers sometimes argue a worker's Valley Fever came from yard work, travel, or just living in an area where the fungus is common, not from the job. Because the standard is a preponderance of the evidence, you do not have to disprove every other possibility. You need enough medical and workplace evidence to show work exposure was the more likely cause.

Strong responses include a timeline connecting your symptoms to specific dusty work, statements from coworkers who saw the same conditions, any safety or training records, and your own doctor's opinion on causation. If your claim is denied, you have the right to appeal. The facts you gathered early usually matter most.

Agricultural work and heat exposure carry their own risks too. If pesticide exposure, harvest injuries, or heat illness are part of your case, see our pages on agricultural worker injuries and heat illness claims.

A Valley Fever claim can turn on dates, dusty worksite details, and medical timing that are easy to get wrong. Eman Yazdchi can review your diagnosis, your notice and filing deadlines, a denied claim, a stalled utilization review, or a settlement offer, and tell you plainly where things stand. The firm reviews each matter's own facts before deciding whether to take a case.

Call (661) 273-1780 or use the contact form to set up a free consultation. Yazdchi Law P.C. serves injured workers across California from its office at 1125 W Avenue M-14, Suite A, Palmdale, CA 93551.