2026 ICD-10-CM Diagnosis Code S90.455ASuperficial foreign body, left lesser toe(s), initial encounter

ICD-10-CM Codes›S00–T88›S90-S99›S90

ICD-10-CM S90.455A
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S90.455A is a billable ICD-10-CM diagnosis code for superficial foreign body, left lesser toe(s), initial encounter. The 7th character A marks it as an initial encounter code, used while the patient is receiving active treatment. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 604 through 605, 963 through 965. Coders also document this condition as foreign body in skin of lesser toe of left foot. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Superficial injury; contusion, initial encounter.

Code Identity

ICD-10-CM Code
S90.455A
Billable Status
Yes — Valid for Submission
Code Describes
Superficial foreign body, left lesser toe(s), initial encounter
Short Description
Superficial foreign body, left lesser toe(s), init encntr
Parent Code
S90.455
Superficial foreign body, left lesser toe(s)

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS90-S99Injuries to the ankle and foot
CategoryS90Superficial injury of ankle, foot and toes
This CodeS90.455ASuperficial foreign body, left lesser toe(s), initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Foreign body in skin of lesser toe of left foot
  • Foreign body in skin of toe
  • Superficial foreign body of skin of left foot

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Superficial injury of ankle, foot and toes (S90). 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 INJ017
Superficial injury; contusion, initial encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Foreign Bodies

If you've ever gotten a splinter or had sand in your eye, you've had experience with a foreign body. A foreign body is something that is stuck inside you but isn't supposed to be there. You may inhale or swallow a foreign body, or you may get one from an injury to almost any part of your body.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert S90.455A to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
917.6 Foreign body foot & toe
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About S90.455AOverview

Is S90.455A (Superficial foreign body, left lesser toe(s)) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report superficial foreign body, left lesser toe(s), initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character A in S90.455A mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for superficial foreign body, left lesser toe(s), such as an emergency visit or first evaluation.

What MS-DRG does S90.455A group to?

When superficial foreign body, left lesser toe(s), initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 604, 605, 963, 964, 965, with relative weights from 0.9160 to 2.7338 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of S90.455A?

Under the General Equivalence Mappings, superficial foreign body, left lesser toe(s), initial encounter converts to ICD-9-CM 917.6 (foreign body foot & toe). The mapping is approximate, so confirm the match fits the documentation.

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.