If the implementing organization examines the severity of the disability of a beneficiary of the employees' disability pension and finds its degree of severity to be classified as any disability grade other than the previous one, the Minister may revise the amount of the employees' disability pension in accordance with its severity.
A beneficiary of an employees' disability pension may request the implementing organization to revise the amount of employees' disability pension on account that the severity of disability has worsen.
A request under the preceding paragraph may only be made after one year has passed since the day on which the beneficiary acquired a right to benefits under an employees' disability pension or underwent an examination by the implementing organization pursuant to the provisions of paragraph (1), except in a case specified by Order of the Ministry of Health, Labour and Welfare as one in which it is clear that the severity of disability of the beneficiary of the employees' disability pension has worsen.
If a beneficiary of an employees' disability pension who has contracted an illness or suffered an injury and who was an insured on the day of initial examination for that injury or illness (limited to an injury or illness for which the day of initial examination comes after the day of initial examination for the injury or illness that constitutes the grounds for payment of the relevant employees' disability pension; the same applies hereinafter in this paragraph and the proviso to Article 54, paragraph (2)), has a disability (limited to a disability of a degree of severity that is not classified as Grade 1 or Grade 2 of the disability grades; hereinafter referred to as "another disability" in this paragraph and the proviso of paragraph (2) of that Article) due to that injury or illness, and if the severity of the beneficiary's disabilities stemming from a combination of the disability constituting the grounds for payment of the relevant employees' disability pension and the other disability (or all other disabilities, if there are two or more other disabilities) has become worse than that of the disability constituting the grounds for payment of that pension during the period from the day of disability assessment for that injury or illness until the day on which the beneficiary reaches 65 years of age, the beneficiary may request the implementing organization to revise the amount of employees' disability pension within that period.
障害厚生年金の受給権者であつて、疾病にかかり、又は負傷し、かつ、その傷病（当該障害厚生年金の支給事由となつた障害に係る傷病の初診日後に初診日があるものに限る。以下この項及び第五十四条第二項ただし書において同じ。）に係る当該初診日において被保険者であつたものが、当該傷病により障害（障害等級の一級又は二級に該当しない程度のものに限る。以下この項及び同条第二項ただし書において「その他障害」という。）の状態にあり、かつ、当該傷病に係る障害認定日以後六十五歳に達する日の前日までの間において、当該障害厚生年金の支給事由となつた障害とその他障害（その他障害が二以上ある場合は、全てのその他障害を併合した障害）とを併合した障害の程度が当該障害厚生年金の支給事由となつた障害の程度より増進したときは、その者は、実施機関に対し、その期間内に障害厚生年金の額の改定を請求することができる。
The provisions under the proviso to Article 47 paragraph (1) apply mutatis mutandis to a case under the preceding paragraph.
If the amount of an employees' disability pension has been revised pursuant to the provisions of paragraph (1), the payment of the revised amount of employees' disability pension is to commence from the month following the month of the revision.
第一項の規定により障害厚生年金の額が改定されたときは、改定後の額による障害厚生年金の支給は、改定が行われた月の翌月から始めるものとする。
The provisions of paragraphs (1) through (3) and the preceding paragraph do not apply to a person who is 65 years of age or older and also the beneficiary of an employees' disability pension (limited to a person who has no right to receive benefits from a basic disability pension under the National Pension Act based on the same grounds for payment of the relevant employees' disability pension).
第一項から第三項まで及び前項の規定は、六十五歳以上の者であつて、かつ、障害厚生年金の受給権者（当該障害厚生年金と同一の支給事由に基づく国民年金法による障害基礎年金の受給権を有しないものに限る。）については、適用しない。