FY2025 · 04-01
Effective from
- Inherited rules changed
Blister (nonthermal) of bilateral front wall of thorax
Category — select a more specific code
CDC/NCHS · FY2025 · 04-01code to identify any retained foreign body, if applicable (Z18.-)
A — initial encounter
D — subsequent encounter
S — sequela
For US diagnosis claims covered by HIPAA, ICD-10-CM is required from October 1, 2015.
Use the service date for outpatient/professional claims and the discharge date for hospital inpatient claims. Earlier encounters use ICD-9-CM; each individual code must also be valid for the applicable date.
Official coding guidelines → · CMS ↗First observed · 2020-10-01
Latest recorded change · FY2025 · 04-01
Effective from
Blister (nonthermal) of bilateral front wall of thorax
Category — select a more specific code
CDC/NCHS · FY2025 · 04-01| All editions | Effective from | Code history |
|---|---|---|
| FY2021 | 2020-10-01 | Added |
| FY2021 · 01-01 | 2021-01-01 | No tabular change |
| FY2022 | 2021-10-01 | No tabular change |
| FY2022 · 04-01 | 2022-04-01 | No tabular change |
| FY2023 | 2022-10-01 | No tabular change |
| FY2023 · 04-01 | 2023-04-01 | No tabular change |
| FY2024 | 2023-10-01 | No tabular change |
| FY2024 · 04-01 | 2024-04-01 | No tabular change |
| FY2025 | 2024-10-01 | No tabular change |
| FY2025 · 04-01 | 2025-04-01 | Inherited rules changed |
| FY2026 | 2025-10-01 | No tabular change |
| FY2026 · April | 2026-04-01 | No tabular change |
| FY2027 | 2026-10-01 | No tabular change |
The official Tabular List has no additional instructions at this code level.
Review the instructions inherited from its parent categories below. Inherited instructions ↓
code to identify any retained foreign body, if applicable (Z18.-)
The appropriate 7th character is to be added to each code from category S20
A — initial encounter
D — subsequent encounter
S — sequela
Other entries in the same category; these are not automatic substitutes.
| Code | Description | Category · further specificity required |
|---|---|---|
| S20.321 | Blister (nonthermal) of right front wall of thorax | Category · further specificity required |
| S20.322 | Blister (nonthermal) of left front wall of thorax | Category · further specificity required |
| S20.324 | Blister (nonthermal) of middle front wall of thorax | Category · further specificity required |
| S20.329 | Blister (nonthermal) of unspecified front wall of thorax | Category · further specificity required |
Official titles and instructions are preserved in their source language. Official sources ↗