Aetna ABA coverage in Arizona: the intake guide.

Aetna puts the recency clock on the functional assessment, not the diagnosis: medical necessity requires "demonstration of functional impairment on a standardized scale of functioning in the past 12 months," and the impairment must be at least one standard deviation below the population mean or represent a significant risk of harm to self or others. The ABA Medical Necessity Guide sets no expiry on the ASD diagnosis itself.^[9]

"There is a DSM-V diagnosis of Autism Spectrum Disorder (ICD-10/ F84.0; F84.3 - F84.9) obtained by an appropriate provider (i.e. licensed psychologist/psychiatrist, physician or other health care professional qualified to diagnose mental health conditions within their scope of practice)." Note the code set the guide actually prints: F84.0 plus F84.3–F84.9, which leaves out F84.1 and F84.2.^[9]

No diagnostic instrument is mandated; the named instruments sit on the functional-impairment test — "the Vineland Adaptive Behavior Scales 3 (VABS-3), the Adaptive Behavior Assessment Scale (ABAS), VB-MAPP or ABLLS" are given as examples of the standardized scale that must show impairment within the past 12 months.^[9]

No referral or physician order is required by the national guide — the gate is the diagnosis "obtained by an appropriate provider" plus precertification. The only prescription requirement Aetna publishes is its Maryland exhibit (COMAR 31.10.39), where the child's primary care or specialty physician must perform the evaluation and prescribe the treatment with specific goals; that exhibit does not reach plans outside Maryland.^[9]

Steven's Law now carries no explicit age limit: SB 1590 (signed May 7, 2025) struck the dollar-cap subsection from all four sections of the mandate, and the age tiers — under 9, and 9 through 16 — lived inside that subsection. Optum's own state-mandate entry describes the change as repealing "the maximum benefit limitations for behavioral therapy coverage for eligible persons who are 16 years old and younger." The carrier's national ABA policy adds no age bound of its own, so age comes from the benefit document, not the statute.^[3][4][9]

Ask the plan: Benefits verification on the specific plan — funding type first, then the ABA benefit terms.

Aetna publishes no day counts of its own: its 2026 manual says "The timing of the review incorporates state, federal, CMS and NCQA requirements," and ABA services "require prior authorization" by calling the number on the member ID card. So the governing clock depends on funding. For a fully insured plan issued in Arizona, A.R.S. § 20-3404 governs: urgent requests "not later than five days after the receipt of all necessary information", non-urgent "not later than fourteen days after receipt of all necessary information", with the same five/fourteen days again after the provider completes an incomplete request — and "A prior authorization request is deemed granted if a health care services plan or its utilization review agent fails to comply with the deadlines." A granted authorization cannot be rescinded after services are rendered in good faith, absent fraud. A self-funded employer plan sits outside state law and follows ERISA: a non-urgent pre-service decision "not later than 15 days after receipt of the claim by the plan", extendable once by up to 15 days; an urgent one within 72 hours; the clock starts when the request is filed, whether or not it is complete; and an urgent request to extend an approved course is decided within 24 hours if made "at least 24 hours prior to the expiration" of the current authorization.^[10][11][12]

Ask the plan: At benefits verification, ask whether the plan is fully insured (a policy issued in the state) or a self-funded employer (ERISA) plan — that decides which clock applies — then ask the carrier’s behavioral health precert line its expected ABA turnaround and how early it wants the reauth.

Arizona’s COB rule for group plans (A.A.C. R20-6-214) sets the order: the plan covering the person other than as a dependent pays first; for a dependent child, "The plan of a parent whose birthday occurs earlier in a calendar year shall cover a dependent child before" the other parent’s plan (month and day only); for separated or divorced parents, the custodial parent’s plan, then the custodial parent’s spouse’s, then the non-custodial parent’s, unless a court decree the plan knows of says otherwise. Self-funded plans follow their own plan document. Aetna says it coordinates "as allowed by state or federal law following the National Associations of Insurance Commissioners (NAIC) guidelines. If there is no applicable law, then we coordinate according to the member's plan" (it names the NAIC birthday and divorced-parent rules); on a secondary claim, send the primary payer’s paid/denied data in the 837 COB loops. Government coverage sorts itself by federal rule: a commercial plan pays before TRICARE, which is secondary to every other health plan but "In any double coverage situation involving Medicaid, CHAMPUS is always the primary payer"; CHAMPVA "is the last payer to OHI"; and Medicaid pays after all of them (42 CFR 433.139), so a child with commercial plus Medicaid needs this plan’s authorization and EOB before Medicaid will pay.^{[13][10][14][15][16][17]}

Ask the plan: Collect both parents’ plans, dates of birth, and any custody decree at intake; confirm primary/secondary with each carrier’s COB unit (and whether the plan is self-funded) before the first claim.

Not published. Aetna's ABA Medical Necessity Guide and CPB 0554 set medical-necessity criteria and precertification requirements but say nothing about which ABA codes may be delivered remotely, or with which place-of-service code.^[9][1]

Ask the plan: Aetna provider services at the number on the member's ID card, and the plan's telehealth/virtual-care policy — confirm before scheduling remote 97155 or 97156.

Aetna sets a duty, not a number. Where a state mandate, plan document or contract allows services from someone neither state-licensed nor BACB-certified, "there must be supervision and direction of the unlicensed or non-certified providers in line with practice standards." The ABA Medical Necessity Guide publishes no supervision percentage, ratio or caseload cap — the operative standard is professional practice plus whatever the contract adds.^[9]

The claim carries the analyst, not the technician. "Services must be provided directly or billed by licensed behavior analysts (in states with behavior analyst licensure laws), board-certified behavior analysts, or licensed psychologists where behavior analysis is within their scope of practice definition, unless state mandates, plan documents or contracts require otherwise." The escape clause matters: a state mandate or your contract can move the line, so confirm before enrolling technicians.^[9]

Aetna does not publish a POS code list for ABA. The one place-of-service boundary it does state is the schools carve-out: pursuant to applicable law Aetna "is not required [to] provide services to a child under an individualized education program or any obligation imposed on a public school by the Individuals with Disabilities Education Act." That is a limit on paying for what the IEP owes, not a blanket ban on the school setting — and it yields to a stronger state mandate. Where ABA is payable in a school, in the community or in a group home is a benefit-document question on Aetna plans.^[9]

Ask the plan: The member's benefit document, and Aetna provider services for whether school-setting ABA is payable on that plan.

Not published. Neither the ABA Medical Necessity Guide nor Aetna's clinical policy bulletin on ABA addresses whether 97153 and 97155 may be billed for the same clock time; Aetna carries the concurrency question in its claim editing rather than in a public policy.

Ask the plan: Aetna precertification/provider services at the number on the member's ID card, and the plan's own reimbursement schedule — ask specifically whether 97155 pays alongside 97153 when analyst, technician and member are all face-to-face.

Not published. Aetna's ABA documents set medical-necessity criteria and precertification requirements for 97151–97158, 0362T and 0373T, but no per-day unit ceiling and no statement of which MUE table applies. The guide does publish typical intensity bands — comprehensive ABA 10–25 hours/week, focused ABA 1–20 hours/week — as clinical guidance, not claim edits.^[9]

Ask the plan: Aetna provider services; confirm before promising a family more than four hours a day of 97153.

Not published in Aetna's ABA materials — no rule on who signs a session note or within what window.

Blocked on: The Aetna provider manual and your participation agreement's documentation clause.