Ambetter from Home State Health is Missouri Health Insurance Marketplace (ACA individual) coverage: it "is underwritten by Celtic Insurance Company, which is a Qualified Health Plan issuer in the Missouri Health Insurance Marketplace." Home State Health also runs MO HealthNet managed care, but ABA for MO HealthNet members is carved out to state fee-for-service; an Ambetter card means commercial rules.
The 2026 Evidence of Coverage (an individual EPO plan) writes in Missouri's autism benefit and says "No limitation exists within the benefits for applied behavior analysis services," subject to prior authorization. Medical necessity follows Centene's ABA policies CP.BH.104 and CP.BH.105.
The 2026 Provider and Billing Manual describes Ambetter from Home State Health as Qualified Health Plan coverage in the Missouri Health Insurance Marketplace, underwritten by Celtic Insurance Company. The EOC is an "Individual EPO Health Benefit Plan": care comes from network providers except emergencies or approved exceptions, and members carry deductibles and coinsurance. Home State Health's policy page lists separate Ambetter copies of CP.BH.104 and CP.BH.105.[2][3][6]
Six months. CP.BH.105 measures protocol-modification billing across "the entire six-month authorization period," and CP.BH.104 requires an "Updated behavior assessment" and an updated treatment plan "at least every six months." Missouri law and the EOC cap how often the plan may review the plan: the carrier "shall have the right to review the treatment plan not more than once every six months unless" the carrier and the treating physician or psychologist agree a more frequent review is necessary.[5][4][3][7]
Hours, not the period, drive partial approvals: CP.BH.104 lets the plan authorize "a lower intensity, frequency, or duration than requested" when documentation supports it, and requests above "six hours per day up to a total of 30 hours per week," or 20 or more hours a week for a child in school full time, need the extra justification the policy lists.[5][4][3][7]
The EOC adopts RSMo 376.1224's definitions: treatment is care "prescribed or ordered for an individual diagnosed with an autism spectrum disorder by a licensed physician or licensed psychologist," including "applied behavior analysis therapy"; an autism service provider includes a person "licensed under chapter 337 as a board-certified behavior analyst" or assistant behavior analyst; a "Line therapist" implements the behavior plan "under the direct supervision of a licensed behavior analyst." On request the provider must furnish records "that substantiate that initial or continued medical treatment is medically necessary and is resulting in improved clinical status," and a treatment plan with "diagnosis, proposed treatment by type, frequency, anticipated duration of treatment, the anticipated outcomes stated as goals, and the frequency by which the treatment plan will be updated."[3][7]
The statute itself allows an ABA maximum of "forty thousand dollars per calendar year for individuals through eighteen years of age," which may be exceeded with prior approval; the Ambetter EOC instead says no limitation exists for ABA.[3][7]
The 2026 manual sets initial claims at 180 days from the date of service for participating providers (365 non-participating), reconsiderations and disputes at 180 days from Ambetter's EOP, and coordination-of-benefits claims at 180 days (365 non-participating) from the primary payer's EOP. Telehealth bills with POS 02 or 10 and the appropriate modifier, "reimbursed at the facility rate unless otherwise required per state guidelines." BCBAs are listed among eligible behavioral health providers; recredentialing "is required every 36 months."[2]
The questions that decide whether a family can start with Ambetter from Home State Health, and what they have to bring. Each maps onto something intake should ask on the first call.
None in the EOC: "No limitation exists within the benefits for applied behavior analysis services." RSMo 376.1224 permits a $40,000 calendar-year ABA maximum "for individuals through eighteen years of age," exceedable with prior approval, but the Ambetter contract does not impose it.[3][7]
CP.BH.104: for a new start the CDE must have been "conducted in the past three years" (or three to five years old plus a diagnostic interview "within 12 months of the authorization request"); for continuing treatment, "within the past five years." The behavioral assessment must be no more than two months before the initial treatment authorization.[4]
CP.BH.104: "a licensed physician, psychologist, or other licensed professional with specialized training in diagnosis and treatment of ASD, or a provider otherwise authorized under state law/regulation." The EOC's treatment definition requires the order from "a licensed physician or licensed psychologist."[4][3]
CP.BH.104: "at least one primary clinician tool and one parent/caregiver tool" (e.g., STAT, ADI-R, CARS-2, ASRS, ADOS-2 plus M-CHAT-R/F, SCQ, SRS-2 Parent Report), with each "Test administered with scores and date completed."[4]
An order, not a PCP referral: the EOC limits autism coverage to "medically necessary treatment that is ordered by the insured's treating licensed physician or licensed psychologist ... in accordance with a treatment plan," and CP.BH.104 requires a recommendation for ABA from a licensed physician, psychologist or qualified licensed professional (it may sit in the CDE). No Ambetter order form is published.[3][4]
The 2026 manual: prospective non-urgent "Within 36 hours, to include (1) business day, receipt of all information needed to complete the review, not to exceed 14 calendar days from receipt of the request"; prospective urgent within 1 calendar day of all information; concurrent urgent within one calendar day (one extension up to 3 calendar days); retrospective within 30 calendar days. This matches RSMo 376.1363's 36-hour rule.[2][8]
Allowed with limits: CP.BH.104 contemplates telehealth as a supplement; CP.BH.105 requires a HIPAA-compliant platform with the provider's camera on, and the monthly one-on-one 97155 protocol work is "Not delivered via telemedicine/telehealth unless allowed by state guidelines." The manual bills telehealth with POS 02/10 and the appropriate modifier. No document lists which ABA codes may be remote.[4][5][2]
Ask the plan: Ambetter from Home State Health Utilization Management — ask code by code (97151, 97153, 97156) before scheduling remote hours.
The EOC's "Other plan" definition covers group and individual insurance, HMOs, self-insured group plans and Medicare, and says "Other plan will not include Medicaid," so MO HealthNet pays after Ambetter. COB claims are due 180 days (365 non-participating) from the primary payer's EOP. The EOC text read this run does not state the order-of-benefit (birthday) rule between two parents' plans.[3][2]
Ask the plan: Ambetter from Home State Health Member or Provider Services — confirm primacy when the child also has a parent's employer plan.
Coverage decides whether Ambetter from Home State Health pays. These decide whether the claim survives: how sessions must be staffed and supervised, what may be billed concurrently, the per-day ceilings, who signs the note, where the service is payable, and whose NPI the claim goes out under.
CP.BH.104: "Adaptive Behavior Treatment with Protocol Modification occurs for at least two hours per week or 10% of the direct service hours provided (whichever is greater), and no more than 20% of direct service hours provided (unless clinical documentation justifies)." CP.BH.105 enforces it: 97153/97154 hours over the authorization period unsupported by that floor are "subject to denial of payment or recoupment." The EOC defines the line therapist as working "under the direct supervision of a licensed behavior analyst."[4][5][3]
No benefit cap in the EOC ("No limitation exists within the benefits for applied behavior analysis services"), but CP.BH.104 sizes requests: "Do not exceed six hours per day up to a total of 30 hours per week" unless documentation justifies more, and "less than 20 hours per week if attending school full-time."[3][4]
CP.BH.105: notes "completed prior to claim submission" with the "Signature of qualified rendering provider/technician"; documentation carries "the signature and printed names of the member/enrollee, legal guardian, rendering clinician/technician and supervising practitioner." Treatment plans carry the BCBA's and parent's signatures (CP.BH.104).[5][4]
CP.BH.104: services "may be provided in various settings (e.g., home, clinic, school, community)"; school hours need a detailed school-based plan, IDEA-covered services are not medically necessary, and services "in lieu of school, respite care" are grounds for discontinuation.[4]
Not published. CP.BH.104/105 reproduce the 97155 CPT descriptor ("which may include simultaneous direction of technician") but state no rule on paying 97153 and 97155 for the same time.[4][5]
Ask the plan: Ambetter from Home State Health Provider Services (number on the member ID card) — ask whether 97155 pays alongside 97153 for the same minutes.
Not published. Neither the manual, the EOC nor CP.BH.104 says whose NPI carries technician 97153 time; the EOC charges "a separate copayment and/or coinsurance" per provider when several providers serve the member the same day.[2][3]
Ask the plan: Ambetter from Home State Health Provider Services or your participation agreement (rendering-provider field on technician lines).
Commercial. Ambetter from Home State Health is Missouri Marketplace coverage underwritten by Celtic Insurance Company; MO HealthNet members get ABA through state fee-for-service instead.
Six months (CP.BH.105 "six-month authorization period"; reassessment and treatment plan update at least every six months). Missouri law lets the plan review the treatment plan no more than once every six months unless agreed otherwise.
Yes — 97151, 97152 and 0362T return "Pre-authorization is required for all providers," as do the treatment codes. Request at least five business days before the service date.
Not in the 2026 EOC, which says no limitation exists for ABA. RSMo 376.1224 would allow a $40,000/yr maximum through age 18, exceedable with prior approval.
180 days from the date of service for participating providers (365 non-participating); 180 days from the EOP for disputes and for secondary claims after a primary payer.
Payer policies change frequently and vary by plan, state, and funding type. This guide was compiled from the sources above and last reviewed October 2026; it is general information, not billing, legal, or clinical advice. Always verify current requirements against the payer's live policy and a benefits check for the specific member.
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