# 健康保険法 / Health Insurance Act — 第四条 (Supplementary Provisions, Article 4)

- Law: 健康保険法 (Health Insurance Act), 大正十一年法律第七十号
- English title "Health Insurance Act": Ministry of Justice translation
- Kind: Act — the distinction between 法律 (Act), 政令 (Cabinet Order), 省令 (Ministerial Order) and 条例 (local ordinance) decides who may issue it and what it may say.
- Provision: 第四条 (Supplementary Provisions, Article 4) — address `suppl-4041-7/art-4`
- Text in force since: 2026-10-01
- URL (the page that opens at this provision): https://japanlaw.org/ja/health-insurance-act/suppl-4041-7/art-4
- Permanent URL (e-Gov law ID, never renamed): https://japanlaw.org/l/211AC0000000070/suppl-4041-7/art-4
- Every provision below carries its address and both URLs on the line under it.
- Japanese text: e-Gov 法令検索, Digital Agency (デジタル庁). English: as marked on each line below.

Only the Japanese as published by the government has legal effect; the text
below is a copy of it. Every English rendering below is a translation and
says which kind: the Ministry of Justice's translation, or this
site's machine translation, whose model and date the Sources list names.
They are never merged and never substituted for one another.

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### 第四条
<sup>suppl-4041-7/art-4 · https://japanlaw.org/ja/health-insurance-act/suppl-4041-7/art-4 · https://japanlaw.org/l/211AC0000000070/suppl-4041-7/art-4</sup>

**第一項**  平成四年三月以前の月（新健保法第二十条の規定による被保険者については、同年四月以前の月）に係る健康保険の保険料については、なお従前の保険料率による。
<sup>suppl-4041-7/art-4/par-1 · https://japanlaw.org/ja/health-insurance-act/suppl-4041-7/art-4/par-1 · https://japanlaw.org/l/211AC0000000070/suppl-4041-7/art-4/par-1</sup>
With regard to insurance premiums for health insurance for months on or before March 1992 (for insured persons under the provisions of Article 20 of the Revised Health Insurance Act, months on or before April of that year), the insurance premium rate previously in force continues to apply.
<sup>machine translation, not official</sup>

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## Cites
- suppl-4041-7/art-4/par-1: 新健保法第二十条 → 健康保険法 第二十条 (Article 20), art-20 — https://japanlaw.org/ja/health-insurance-act/art-20 · https://japanlaw.org/l/211AC0000000070/art-20

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## Sources

- e-Gov 法令検索, Digital Agency (デジタル庁) — 健康保険法 — the text in force from 2026-10-01 (https://laws.e-gov.go.jp/law/211AC0000000070/20261001_507AC0000000087), retrieved 2026-10-10
- Japanese Law Translation Database System, Ministry of Justice (法務省) — Health Insurance Act — Ministry of Justice translation (https://www.japaneselawtranslation.go.jp/en/laws/view/3266/tb), retrieved 2026-10-10
- claude-sonnet-5-5 — Machine translation, batch health-insurance-act-20261010T183826-017, translated 2026-10-11
- This site's parser, version 189 — 健康保険法 — structure, counts, cross-references and defined terms, computed 2026-10-10