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Code history

Was this code valid on the date of service, and what did it map to under the model that paid that year? 10 code sets, FY2018 through FY2027.

How to use this page

Whether a code was valid on the date of service, and what it mapped to under the model that paid that year.

  1. Paste the codes, and give the date of service if you have one.
  2. The code set turns over on 1 October, so a date in October, November or December belongs to the NEXT fiscal year — 4 November 2021 is FY2022. The page does that conversion for you.
  3. The verdict block answers the date directly. The table below it shows every year loaded, so you can see when a code arrived, when it went, and when its wording changed.
  4. The change log flags what matters in a review: new, deleted, reworded, billable status, and any move between HCCs within the same model.

What this page does not do

  • A year with no model files loaded reads "no model loaded", never "maps to nothing". Those are different facts and only one of them is about the code.
  • HCC movement is compared within a model. The V24 to V28 changeover is a change of model, not a change to the code, and is not reported as one.
  • It reports what the published files say. Whether a code belonged on that claim is answered by the documentation.

All page guides →

On 2021-06-01 — the FY2021 code set effective 2020-10-01 to 2021-09-30

T40.4X1A Not in this code set

Last valid in FY2020 (through 2020-09-30).

T40.4X1A Poisoning by other synthetic narcotics, accidental (unintentional), initial encounter

Fiscal year Effective In the code set Billable Maps to
FY2018 2017-10-01 → 2018-09-30 Yes Yes —
FY2019 2018-10-01 → 2019-09-30 Yes Yes CMS23 55
FY2020 2019-10-01 → 2020-09-30 Yes Yes CMS24 55
FY2021 2020-10-01 → 2021-09-30 No
FY2022 2021-10-01 → 2022-09-30 No
FY2023 2022-10-01 → 2023-09-30 No
FY2024 2023-10-01 → 2024-09-30 No
FY2025 2024-10-01 → 2025-09-30 No
FY2026 2026-01-01 → 2026-12-31 No
FY2026 2025-10-01 → 2026-09-30 No
FY2027 2026-10-01 → 2027-09-30 No
  1. HCC FY2019 CMS23: no mapping → HCC55
  2. Deleted FY2020 Last valid 2020-09-30; not in the FY2021 code set
  3. HCC FY2020 CMS23: HCC55 → no mapping
  4. HCC FY2020 CMS24: no mapping → HCC55

See how these codes overlap across every year →

Built from the CMS and NCHS code set releases and the published CMS-HCC model files, all public domain. This reports what the files say; whether a code belongs on a claim is answered by the documentation.