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✦ Certified Specialist in Workers’ Compensation Law — Certified by the State Bar of California, Board of Legal Specialization ✦
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By Eman Yazdchi, Esq. · Certified Specialist in Workers' Compensation Law, State Bar of California Board of Legal Specialization
In California, a Medical Provider Network (MPN) is the insurer-approved list of physicians an injured worker is generally required to see for treatment under California Labor Code §4600, with treatment subject to Utilization Review under §4610. Yazdchi Law handles California MPN access disputes statewide.
A Medical Provider Network (MPN) is an insurer-curated list of California physicians an injured worker is generally required to select from for treatment of an industrial injury under California Labor Code §4600. Once an MPN is properly noticed to the worker, treatment outside the MPN is generally not paid by the workers' compensation insurer. Treatment within the MPN is still subject to Utilization Review under California Labor Code §4610, but the MPN restricts which physicians the worker can see in the first place.
Once a California workers' compensation insurer properly notices the MPN to the injured worker — by mail with the required MPN information packet — treatment under California Labor Code §4600 must generally be obtained from physicians on the MPN list. Treatment outside the MPN after proper notice is generally not paid. The MPN must provide an adequate number of physicians within reasonable geographic distance, with primary care and specialty access for the injury type.
Within a California MPN, an injured worker may generally change Primary Treating Physician at any time by selecting another physician on the MPN list — no insurer approval is required. The worker may also request a second opinion or third opinion within the MPN for a disputed diagnosis or treatment plan. Treatment changes within the MPN remain subject to Utilization Review under California Labor Code §4610, which controls medical-necessity decisions.
When a California MPN cannot provide a physician in the specialty required for the industrial injury — a hand surgeon, a pain management specialist for chronic pain, a psychiatrist for a psychiatric claim under California Labor Code §3208.3 — the injured worker may treat outside the MPN at the insurer's expense under California Labor Code §4600. The insurer's failure to maintain adequate specialty access voids the MPN restriction for that specialty.
Under California Labor Code §4600, a California employee may predesignate a Primary Treating Physician — typically the worker's regular personal physician — in writing before an industrial injury. A valid predesignation overrides the MPN restriction, and the worker may treat with the predesignated physician. Predesignation requires the named physician to agree in advance to treat for an industrial injury, have the worker's medical history, and the employer to receive the notice before the injury.
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Tap to call →Last reviewed by Eman Yazdchi, Esq., May 2026.
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