Emergency Medicine Billing Services in California

Two regimes run side by side in California and get conflated constantly. AB 72 governs non-emergency services: where an enrollee "receives covered services from a contracting health facility at which, or as a result of which, the enrollee receives services provided by a noncontracting individual health professional," the enrollee "shall pay no more than the same cost sharing that the enrollee would pay for the same covered services received from a contracting individual health professional." For those claims the plan reimburses "the greater of the average contracted rate (ACR), or 125 percent of the Medicare reimbursement rate," and an unresolved dispute goes to the Department of Managed Health Care's Independent Dispute Resolution Process.

None of that reaches an emergency department claim. Health & Safety Code 1371.9(k) reads: "This section shall not apply to emergency services and care, as defined in Section 1317.1." Insurance Code 10112.8(i) carries the identical exclusion: "This section shall not apply to emergency services and care, as defined in Section 1317.1 of the Health and Safety Code." Both were last amended by Stats. 2024, Ch. 520 (SB 1061), effective January 1, 2025, and that amendment did not pull emergency care in.

What bars balance billing in the ED is case law. In Prospect Medical Group, Inc. v. Northridge Emergency Medical Group, 45 Cal.4th 497 (2009), the California Supreme Court read the Knox-Keene Act and held that "billing disputes over emergency medical care must be resolved solely between the emergency room doctors, who are entitled to a reasonable payment for their services, and the HMO, which is obligated to make that payment. A patient who is a member of an HMO may not be injected into the dispute. Emergency room doctors may not bill the patient for the disputed amount."

The payment standard is where groups relocating from other states get caught. California sets no percentage-of-Medicare and no average-contracted-rate benchmark for out-of-network emergency services. 28 CCR 1300.71(a)(3)(B) requires "the payment of the reasonable and customary value for the health care services rendered based upon statistically credible information that is updated at least annually and takes into consideration" six factors: the provider's training, qualifications and length of time in practice; the nature of the services provided; the fees usually charged by the provider; prevailing provider rates charged in the general geographic area in which the services were rendered; other aspects of the economics of the medical provider's practice that are relevant; and any unusual circumstances in the case. That is an evidentiary argument, not an arithmetic, so we assemble the supporting file while the claim is young.

California's emergency protection runs through the Knox-Keene Act, so it reaches enrollees of DMHC-licensed health care service plans. It does not reach a self-funded employer plan. CMS states the general rule plainly: "State surprise billing laws generally do not apply to self-insured group health plans sponsored by a private employer." CMS adds that ERISA "does not prevent state laws from allowing self-insured, ERISA-covered plans to choose to voluntarily comply with them." California publishes no such opt-in mechanism — none appears in HSC 1371.9, Insurance Code 10112.8, or DMHC and CDI guidance. For those patients the federal No Surprises Act governs, and the federal act is uniform: it is the same statute in California as in Texas. Any vendor page that presents the federal rules as a state-by-state variable is describing something that does not exist.

The Department of Insurance side has less published guidance to work from. CDI's AB 72 consumer fact sheet — signed by Insurance Commissioner Dave Jones, who left office in January 2019, so it predates the No Surprises Act entirely — states: "Emergency care is excluded from the prohibition on surprise billing contained in AB 72, though some policies already had protection from balance billing ... in this situation under existing law." The same fact sheet says AB 72 does not apply to Medi-Cal plans, Medicare plans or self-insured plans. Note what that first sentence does and does not settle: it excludes emergency care from AB 72 while acknowledging that some policies already carried balance-billing protection under existing law, so it cannot be read as a scope ruling on emergency claims. CDI publishes no bulletin or notice stating whether California law functions as a "specified state law" for out-of-network emergency services under CDI-regulated policies. For a group whose PPO volume sits on the insurance-code side that is a live question, and we treat it as unresolved rather than assumed.

Government products sit outside the DMHC surprise-billing guidance altogether: All Plan Letter 22-011 states it "does not apply to Medicare Advantage, Medi-Cal managed care, or specialized health plan products."

Enforcement is California-specific too. In its December 22, 2021 letter to the state, CMS recorded that "the California Department of Insurance and Department of Managed Health Care stated they lack authority to enforce sections 2799B-1, 2799B-2, 2799B-3, 2799B-6, 2799B-7, 2799B-8, and 2799B-9 with respect to health care providers and facilities" — the provider-side federal balance-billing rules are enforced here through a collaborative enforcement agreement with CMS rather than by a state regulator, which changes who your billing office is answerable to when a patient disputes an ED bill. Eligibility, not assumption, tells you which rulebook a given encounter sits under, which is why we verify funding type at intake.

An ED group that goes looking for a California independent dispute resolution process for an underpaid emergency claim will not find one. HSC 1371.30(a)(1) establishes the IDRP only "for the purpose of processing and resolving a claim dispute between a health care service plan and a noncontracting individual health professional for services subject to subdivision (a) of Section 1371.9" — AB 72 non-emergency services — and subdivision (g) of the same section carries its own standalone exclusion for emergency services and care. Where the process does apply, "the parties shall complete the plan's internal process" first, and the decision "shall be binding on both parties." For emergency care the door is closed, so the escalation ladder looks like this:

1. File the provider dispute with the plan. Under 28 CCR 1300.71.38, a plan may not "impose a deadline for the receipt of a provider dispute for an individual claim, billing dispute or other contractual dispute that is less than 365 days" of the plan's action, or — where the plan did nothing — 365 days after the time for contesting or denying the claim expired. That floor is the widest window most ED groups have — and it is easy to spend it waiting.
2. Build the reasonable-and-customary record inside it. The six factors in 28 CCR 1300.71(a)(3)(B) are the only payment standard California gives an emergency claim, so the dispute has to carry evidence — charge history, comparable rates in the geographic area, acuity, unusual circumstances — not indignation.
3. Collect what the determination produces. Where a dispute "is determined in whole or in part in favor of the provider," 28 CCR 1300.71.38(g) requires the plan to pay outstanding monies "and all interest and penalties required under sections 1371 and 1371.35" within five working days of the written determination.
4. Preserve the federal track in parallel. Two primary sources disagree about whether the federal process is available here, and none of your claims should be the test case.
5. Escalate to the regulator, then to an action for the reasonable value of the services.

Step four deserves the detail. CMS's December 22, 2021 letter named only the AB 72 statutes as specified state laws, and did so only "with respect to non-emergency services furnished to individuals ... by noncontracting individual health professionals at contracting health facilities." The same letter said the federal independent dispute resolution process "will apply ... by nonparticipating providers and nonparticipating emergency facilities to which" those sections do not apply. DMHC's APL 22-011, issued March 21, 2022, tells its licensees the opposite: DMHC states it confirmed with CMS that these laws are "specified state law" within the meaning of the NSA, so "DMHC-licensed health plans must continue to comply with California law regarding enrollee cost-sharing, provider reimbursement, and the resolution of disputes between plans and providers/facilities for out-of-network emergency services." Neither agency has published a document reconciling the two, and DMHC has issued no later All Plan Letter on the federal act. Our denial management workflow does not pick a winner: we work the state provider dispute and preserve the federal open-negotiation and IDR clocks in parallel, because a lapsed federal deadline is unrecoverable and a redundant filing is not.

AB 3275 (Stats. 2024, Ch. 763) replaced California's split prompt-pay standard with a single deadline, and the change took effect for claims received on or after January 1, 2026. DMHC All Plan Letter 25-007 (April 1, 2025) states: "Beginning January 1, 2026, Sections 1371 and 1371.35 require a health plan to reimburse a complete claim, or portion thereof, as soon as practicable but no later than 30 calendar days after receipt of the claim. If a claim, or portion thereof, is contested or denied, the health plan must notify the claimant in writing as soon as practicable, but no later than 30 calendar days after receipt of the claim by the health plan." CDI-regulated insurers sit on the identical standard under Insurance Code 10123.13(b): where an uncontested claim is not reimbursed within 30 calendar days after receipt, "interest shall accrue at the rate of 15 percent per annum beginning with the first calendar day after the 30-calendar-day period."

Calendar days, not working days — and there is no separate paper-claim window. California does not distinguish electronic from paper claims for this deadline, so if you arrived from a state that gives payers 30 days electronic and 45 days paper, delete that model.

Interest is not something you request. Insurance Code 10123.13(b) requires the insurer to "automatically include ... all interest that has accrued ... without requiring the claimant to submit a request for the interest amount." A payer that fails to do so "shall pay the claimant a fee of the greater of an additional fifteen dollars ($15) or 10 percent of the accrued interest."

Now the trap, and it is a real one. 28 CCR 1300.71(g) was never conformed to the new statute. It still reads that a plan shall reimburse each complete claim "no later than thirty (30) working days after the date of receipt of the complete claim ... or if the plan is a health maintenance organization, 45 working days after the date of receipt of the complete claim by the plan or the plan's capitated provider". DMHC has published no rulemaking amending it. The statute and the All Plan Letter control; the regulation text is stale — and a billing office calendaring from the regulation will let the interest window lapse on the HMO claims it touches. The same staleness runs the other way on Medi-Cal: AB 3275 added Welfare & Institutions Code 14093.08, providing that "Sections 1371 and 1371.35 of the Health and Safety Code apply to Medi-Cal managed care plan contracts entered into with the State Department of Health Care Services pursuant to this chapter or Chapter 8 (commencing with Section 14200)." Because that section binds by contract type rather than by licensure, it reaches County Organized Health System contracts as well, and DMHC's implementing guidance applies to commercial and Medi-Cal plans alike. Anyone still calendaring Medi-Cal managed care emergency claims on the old working-day expectation is giving away statutory interest it is entitled to claim.

Our accounts receivable follow-up team ages California claims against the 30-calendar-day statute rather than against a generic 45-day rule, and bills the interest line separately: a plan that pays the claim and omits accrued interest has not paid the claim in full.

DHCS reports that "approximately 15.2 million Medi-Cal members in all 58 counties receive their health care through five main models of managed care: Two-Plan, County Organized Health Systems (COHS), Geographic Managed Care (GMC), Regional Model (RM), and Single-Plan." Two things about that roster matter to an ED group. First, it is stable: DHCS "will postpone the next commercial Medi-Cal managed care plan (MCP) procurement by at least two years." The next competition begins "no sooner than 2029," and "Current MCP contracts will be extended from January 1, 2026, to December 31, 2026, by the established annual process." The last roster change was the January 1, 2024 transition, when five commercial plans — Anthem, Blue Shield of California Promise, Community Health Group, Health Net Community Solutions and Molina — took contracts across 21 counties; California Health & Wellness began operating under the name Health Net Community Solutions; and Kaiser took a direct state contract, pending federal approval, as "a plan option in 32 counties for some Medi-Cal members." Second, DHCS publishes no dated master roster, so we confirm plan assignment county by county.

The trap sits in the Two-Plan Model counties. 22 CCR 53855 — which lives in the Two-Plan Model chapter, not a statewide rule — requires plans to "reimburse, without prior authorization, hospital emergency departments or emergency physicians for medical screening examinations necessary to determine the presence or absence of an emergency medical condition and, if an emergency medical condition exists, for all services medically necessary to stabilize the plan member." But if the screening examination "indicates that the patient's condition does not constitute an emergency as defined in section 51056," the ED "shall obtain prior authorization from the plan to render treatment." Where it was not obtained, the plan "may deny reimbursement for any services rendered to the member beyond the medical screening examination". The plan must answer that request "within 30 minutes, or the request shall be deemed to be approved" — a deemed approval that is only collectible if someone timestamped the request. In COHS, GMC, Regional and Single-Plan counties the controlling authority is the DHCS contract, not this chapter.

Fee-for-service Medi-Cal has a filing ladder rather than a cliff:

Managed care is different. DHCS publishes no statewide Medi-Cal managed care filing deadline, so a vendor quoting one number is guessing. The only state-law floor is 28 CCR 1300.71(b)(1): a plan may not impose a receipt deadline "less than 90 days for contracted providers and 180 days for non-contracted providers after the date of service". DHCS's model fact sheet states COHS plans are "exempt from state Knox-Keene Act licensure requirements" — so COHS filing windows are contractual, but their prompt-pay and interest obligations are not, because WIC 14093.08 reaches them through the DHCS contract. Our Medicaid billing operations hold the contracted window per plan, per county, and our claims submission workflow files fee-for-service against the six-month billing limit rather than the twelve-month outer edge.

Kaiser Permanente leads California's combined commercial market at 36 percent, with Elevance Health second at 24 percent, per the AMA's 2025 competition study (shares as of January 1, 2024). That headline is close to useless for an independent group: Kaiser is a closed integrated system, and the product that actually generates out-of-network ED claims is PPO, where Elevance Health holds 51 percent and Blue Shield of California 20 percent. Our commercial insurance billing team staffs escalation contacts and appeal templates against the PPO number, not the combined-market headline. The AMA flags a caveat that lands here: "Data are based on enrollments in both fully and self-insured health plans." Those shares therefore say nothing about the fully-insured versus self-funded split that decides whether state or federal law governs a given emergency claim.

California gives emergency physicians a recovery channel, plus a collection right groups routinely over-correct away. Health & Safety Code 1797.98a(b)(5)(A) directs that "Fifty-eight percent of the balance of the fund shall be distributed to physicians and surgeons for emergency services ... up to the time the patient is stabilized" — the county Maddy EMS Fund, a route for uncompensated emergency care that never appears on a clearinghouse dashboard. Separately, 28 CCR 1300.71.39 defines unfair billing patterns for emergency providers, yet states that "Co-payments, coinsurance and deductibles that are the financial responsibility of the enrollee are not amounts owed the provider by the health care service plan." Cost sharing is collectible; groups that over-correct after Prospect write off money they may bill. California's fair-pricing article reaches emergency physicians and defines a financially qualified patient by "family income that does not exceed 400 percent of the federal poverty level" (HSC 127450, last amended by Stats. 2024, Ch. 511), so self-pay screening runs against that line.

Money aimed at emergency physicians is proposed rather than banked. DHCS's Proposition 35 spending plan proposes $355 million per calendar year under the line item "Emergency Department Facilities and Physicians", and every emergency line in it is written as a proposal: "DHCS proposes to use $7 million in CY 2025 and $7 million in CY 2026 to support the non-federal share of Targeted Rate Increases to 87.5 percent of the Medicare rate attributable to utilization of applicable procedure codes by emergency physicians." A second line proposes $93 million in each of CY 2025 and CY 2026 toward the non-federal share of limited-term uniform dollar increases for emergency physician services, for dates of service July 1, 2025 through December 31, 2026, in both the fee-for-service and managed care delivery systems. Proposed is not appropriated: forecast revenue off those lines and you are forecasting a proposal.

Finally, an absence with direct commercial consequence: neither DMHC, CDI nor DHCS publishes a California ED denial rate, an ED days-in-A/R benchmark, an ED clean-claim rate, or payer-level ED denial statistics. A vendor quoting you a California ED denial rate is relabeling national data or inventing it. We benchmark your department against its own prior-period performance and the statutory clocks — the only California-specific numbers that exist.