Wis. Stat. § 632.32

(bh) "Phantom motor vehicle" means a motor vehicle to which all of the following apply:

1. The motor vehicle is involved in an accident with a person who has uninsured motorist coverage.

(d) "Underinsured motorist coverage" means coverage for the protection of persons insured under that coverage who are legally entitled to recover damages for bodily injury, death, sickness, or disease from owners or operators of underinsured motor vehicles.

(g) "Uninsured motor vehicle" means a motor vehicle, other than a motor vehicle owned by a governmental unit, that is involved in an accident with a person who has uninsured motorist coverage and with respect to which, at the time of the accident, a bodily injury liability insurance policy is not in effect and the owner or operator has not furnished proof of financial responsibility for the future under subch. III of ch. 344 and is not a self-insurer under any other applicable motor vehicle law. "Uninsured motor vehicle" also includes any of the following motor vehicles, other than a motor vehicle owned by a governmental unit, involved in an accident with a person who has uninsured motorist coverage:

(4) Required uninsured motorist and medical payments coverages. (a) Except as provided in par. (d) , every policy of insurance subject to this section that insures with respect to any motor vehicle registered or principally garaged in this state against loss resulting from liability imposed by law for bodily injury or death suffered by any person arising out of the ownership, maintenance, or use of a motor vehicle shall contain therein or supplemental thereto provisions for all of the following coverages: 1. Excluding a policy written by a town mutual organized under ch. 612 , uninsured motorist coverage, in limits of at least $25,000 per person and $50,000 per accident. 2. Medical payments coverage, in the amount of at least $1,000 per person. Coverage written under this subdivision may be excess coverage over any other source of reimbursement to which the insured person has a legal right. (bc) Notwithstanding par. (a) 2. , the named insured may reject medical payments coverage. If one named insured rejects the coverage, the coverage need not be provided in a subsequent renewal policy issued by the same insurer unless a named insured under the policy requests it in writing. (c) Unless an insurer waives the right to subrogation, insurers making payment under any of the coverages under this subsection shall, to the extent of the payment, be subrogated to the rights of their insureds. (d) This subsection does not apply to a commercial liability policy if the coverage it provides for the insured's liability arising out of the maintenance or use of a motor vehicle is limited to coverage for motor vehicles that are not owned motor vehicles, or to an umbrella or excess liability policy. If a commercial liability policy or an umbrella or excess liability policy provides medical payments coverage or uninsured motorist coverage, however, the coverage must have limits of at least those specified in par. (a) . (4m) Underinsured motorist coverage. (a) Except as provided in par. (e) , an insurer writing policies that insure with respect to a motor vehicle registered or principally garaged in this state against loss resulting from liability imposed by law for bodily injury or death suffered by a person arising out of the ownership, maintenance, or use of a motor vehicle shall provide to one named insured under each such insurance policy that goes into effect after November 1, 2011, that is written by the insurer and that does not include underinsured motorist coverage written notice of the availability of underinsured motorist coverage, including a brief description of the coverage. An insurer is required to provide the notice required under this paragraph only one time and in conjunction with the delivery of the policy. (b) Acceptance or rejection of underinsured motorist coverage by a person after being notified under par. (a) need not be in writing. The absence of a premium payment for underinsured motorist coverage is conclusive proof that the person has rejected such coverage. The rejection of such coverage by the person notified under par. (a) shall apply to all persons insured under the policy, including any renewal of the policy. (c) If a person rejects underinsured motorist coverage after being notified under par. (a) , the insurer is not required to provide such coverage under a policy that is renewed to the person by that insurer unless an insured under the policy subsequently requests such underinsured motorist coverage in writing. (d) If an insured accepts underinsured motorist coverage, the insurer shall include the coverage in limits of at least $50,000 per person and $100,000 per accident. (e) This subsection does not apply to a commercial liability policy if the coverage it provides for the insured's liability arising out of the maintenance or use of a motor vehicle is limited to coverage for motor vehicles that are not owned motor vehicles, or to an umbrella or excess liability policy. If a commercial liability policy or an umbrella or excess liability policy provides underinsured motorist coverage, however, the coverage must have limits of at least those specified in par. (d) .

(5) Permissible provisions. (a) A policy may limit coverage to use that is with the permission of the named insured or, if the insured is an individual, to use that is with the permission of the named insured or an adult member of that insured's household other than a chauffeur or domestic servant. The permission is effective even if it violates s. 343.45 (2) and even if the use is not authorized by law. (b) If the policy is issued to anyone other than a motor vehicle handler, it may limit the coverage afforded to a motor vehicle handler or its officers, agents or employees to the limits under s. 344.01 (2) (d) and to instances when there is no other valid and collectible insurance with at least those limits whether the other insurance is primary, excess or contingent. (c) If the policy is issued to a motor vehicle handler, it may restrict coverage afforded to anyone other than the motor vehicle handler or its officers, agents or employees to the limits under s. 344.01 (2) (d) and to instances when there is no other valid and collectible insurance with at least those limits whether the other insurance is primary, excess or contingent. (d) If a motor vehicle covered by the policy is sold or transferred, the purchaser or transferee is not an additional insured unless the consent of the insurer is endorsed on the policy. (e) A policy may provide for exclusions not prohibited by sub. (6) or other applicable law. Such exclusions are effective even if incidentally to their main purpose they exclude persons, uses or coverages that could not be directly excluded under sub. (6) (b) . (f) A policy may provide that, regardless of the number of policies involved, vehicles involved, persons covered, claims made, vehicles or premiums shown on the policy, or premiums paid, the limits for any coverage under the policy may not be added to the limits for similar coverage applying to other motor vehicles to determine the limit of insurance coverage available for bodily injury or death suffered by a person in any one accident. (g) A policy may provide that the maximum amount of uninsured motorist coverage, underinsured motorist coverage, or medical payments coverage available for bodily injury or death suffered by a person who was not using a motor vehicle at the time of an accident is the highest single limit of uninsured motorist coverage, underinsured motorist coverage, or medical payments coverage, whichever is applicable, for any motor vehicle with respect to which the person is insured. (i) A policy may provide that the limits under the policy for uninsured motorist coverage or underinsured motorist coverage for bodily injury or death resulting from any one accident shall be reduced by any of the following that apply: 1. Amounts paid by or on behalf of any person or organization that may be legally responsible for the bodily injury or death for which the payment is made. 2. Amounts paid or payable under any worker's compensation law. 3. Amounts paid or payable under any disability benefits laws. (j) A policy may provide that any coverage under the policy does not apply to a loss resulting from the use of a motor vehicle that meets all of the following conditions: 1. Is owned by the named insured, or is owned by the named insured's spouse or a relative of the named insured if the spouse or relative resides in the same household as the named insured. 2. Is not described in the policy under which the claim is made.