2026 ICD-10-CM Diagnosis Code S20.353DSuperficial foreign body of bilateral front wall of thorax, subsequent encounter

ICD-10-CM Codes›S00–T88›S20-S29›S20

ICD-10-CM S20.353D
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S20.353D is a billable ICD-10-CM diagnosis code for superficial foreign body of bilateral front wall of thorax, subsequent encounter. The 7th character D marks it as a subsequent encounter code, used during routine care in the healing or recovery phase. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 949 through 950. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Superficial injury; contusion, subsequent encounter.

Code Identity

ICD-10-CM Code
S20.353D
Billable Status
Yes — Valid for Submission
Code Describes
Superficial foreign body of bilateral front wall of thorax, subsequent encounter
Short Description
Superficial fb of bilateral front wall of thorax, subs
Parent Code
S20.353
Superficial foreign body of bilateral front wall of thorax

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS20-S29Injuries to the thorax
CategoryS20Superficial injury of thorax
This CodeS20.353DSuperficial foreign body of bilateral front wall of thorax, subsequent encounter

Present on Admission (POA)Billing

S20.353D is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Superficial injury of thorax (S20). Use the following options for the applicable episode of care:

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INJ054
Superficial injury; contusion, subsequent encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Code History & ChangesHistory

Replacement S20.353D replaces the following previously assigned code(s):

  • S20.351D - Superficial foreign body of right front wall of thorax, subs
  • S20.352D - Superficial foreign body of left front wall of thorax, subs
FY 2021AddedAdded to the ICD-10-CM code setEffective October 1, 2020.
FY 2022–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About S20.353DOverview

Is S20.353D (Superficial foreign body of bilateral front wall of thorax) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report superficial foreign body of bilateral front wall of thorax, subsequent encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character D in S20.353D mean?

The final character D marks a subsequent encounter: use it for routine care while the superficial foreign body of bilateral front wall of thorax is healing, after active treatment has ended.

What MS-DRG does S20.353D group to?

When superficial foreign body of bilateral front wall of thorax, subsequent encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 949, 950, with relative weights from 0.6277 to 1.1897 depending on complications. Higher weights mean higher Medicare reimbursement.

Is S20.353D exempt from POA reporting?

Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for superficial foreign body of bilateral front wall of thorax, subsequent encounter on inpatient claims.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.