2026 ICD-10-CM Diagnosis Code S90.221AContusion of right lesser toe(s) with damage to nail, initial encounter

ICD-10-CM Codes›S00–T88›S90-S99›S90

ICD-10-CM S90.221A
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S90.221A is a billable ICD-10-CM diagnosis code for contusion of right lesser toe(s) with damage to nail, 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Superficial injury; contusion, initial encounter.

Code Identity

ICD-10-CM Code
S90.221A
Billable Status
Yes — Valid for Submission
Code Describes
Contusion of right lesser toe(s) with damage to nail, initial encounter
Short Description
Contusion of right lesser toe(s) w damage to nail, init
Parent Code
S90.221
Contusion of right lesser toe(s) with damage to nail

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 CodeS90.221AContusion of right lesser toe(s) with damage to nail, initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Hematoma of right foot
  • Hematoma of toe of right foot
  • Mass of skin of toe of right foot
  • Subungual hematoma of foot
  • Subungual hematoma of lesser toe
  • Subungual hematoma of lesser toe of right foot
  • Subungual hematoma of toe of right 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

Bruises

A bruise is a mark on your skin caused by blood trapped under the surface. It happens when an injury crushes small blood vessels but does not break the skin. Those vessels break open and leak blood under the skin.

Read the full article at MedlinePlus

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

Convert S90.221A to ICD-9-CMHistory

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

ICD-9-CM
924.3 Contusion of 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 S90.221AOverview

Is S90.221A (Contusion of right lesser toe(s) with damage to nail) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report contusion of right lesser toe(s) with damage to nail, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character A in S90.221A mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for contusion of right lesser toe(s) with damage to nail, such as an emergency visit or first evaluation.

What MS-DRG does S90.221A group to?

When contusion of right lesser toe(s) with damage to nail, 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 S90.221A?

Under the General Equivalence Mappings, contusion of right lesser toe(s) with damage to nail, initial encounter converts to ICD-9-CM 924.3 (contusion of 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.