2026 ICD-10-CM Diagnosis Code S90.121SContusion of right lesser toe(s) without damage to nail, sequela
S90.121S is a billable ICD-10-CM diagnosis code for contusion of right lesser toe(s) without damage to nail, sequela. The 7th character S marks it as a sequela code, which reports a problem that remains after the original condition has resolved. 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. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Injury, sequela.
Code Identity
Code Classification
Present on Admission (POA)Billing
S90.121S is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Injuries to the ankle and foot (S90-S99).
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Contusion of lesser toe of right foot
- Contusion of right foot
- Contusion of right toe
- Contusion of toe
- Hematoma of fifth toe
- Hematoma of fourth toe
- Hematoma of right foot
- Hematoma of right fourth toe
- Hematoma of right little toe
- Hematoma of right second toe
- Hematoma of right third toe
- Hematoma of second toe
- Hematoma of third toe
- 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.
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.
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Convert S90.121S to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S90.121SOverview
What is the ICD-10 code for contusion of right lesser toe(s) without damage to nail, sequela?
The ICD-10-CM code for contusion of right lesser toe(s) without damage to nail, sequela is S90.121S (sometimes written as S90121S). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is S90.121S (Contusion of right lesser toe(s) without 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) without damage to nail, sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character S in S90.121S mean?
The final character S makes this a sequela code: it reports a lingering problem that remains after the contusion of right lesser toe(s) without damage to nail itself has resolved, not the original event.
What MS-DRG does S90.121S group to?
When contusion of right lesser toe(s) without damage to nail, sequela is the principal diagnosis on an inpatient stay, it groups to MS-DRG 604, 605, with relative weights from 0.9160 to 1.4721 depending on complications. Higher weights mean higher Medicare reimbursement.
Is S90.121S 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 contusion of right lesser toe(s) without damage to nail, sequela on inpatient claims. The code appears in the Injuries to the ankle and foot (S90-S99) range of the CMS exempt list.
