What does ICD-10 code S90.446 mean?

ICD-10 code S90.446 is the standardized code used for external constriction, unspecified lesser toe(s) in medical records and coding systems.

When is ICD-10 code S90.446 used?

Doctors, hospitals, and insurers may use ICD-10 code S90.446 when recording external constriction, unspecified lesser toe(s) in a standardized format.

Does ICD-10 code S90.446 confirm a diagnosis?

No. A code helps standardize documentation and claims, but it should not be read as a substitute for a clinician's full assessment.

ICD10BillableValid for clinical use

ICD-10 Code S90.446: External constriction, unspecified lesser toe(s)

Name: ICD-10 Code S90.446: External constriction, unspecified lesser toe(s)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T06:39:33.820Z

S90.446 is a billable ICD-10 diagnosis code used to classify External constriction, unspecified lesser toe(s) in medical records and claims. You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records. ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Injury, poisoning and certain other consequences of external causes (S00-T88).

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Injury, poisoning and certain other consequences of external causes (S00-T88).

When is it used?

May be used when a clinician documents external constriction, unspecified lesser toe(s) in a patient's medical record.
May appear in hospital records, claims, referrals, and clinical documentation.
This code can be used as a clinically usable diagnosis entry in standardized coding workflows.

What it does not mean

A code alone does not explain severity, treatment plan, or outcome.
A medical code should not be treated as a substitute for a doctor's diagnosis or advice.

Code hierarchy

chapter

19Injury, poisoning and certain other consequences of external causes (S00-T88)

block

S90-S99Injuries to the ankle and foot

Where you may see this code

You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.

Related specialists

Emergency Medicine SpecialistOrthopedic Specialist

Sibling codes

S90.441External constriction, right great toebillable S90.442External constriction, left great toebillable S90.443External constriction, unspecified great toebillable S90.444External constriction, right lesser toe(s)billable S90.445External constriction, left lesser toe(s)billable

Coding guidelines

Common synonyms

External constriction, unspecified lesser toe(s)External constrictionExternal constriction, unspecified lesser toeExternal constriction, unspecified lesser toe s

Frequently asked questions

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.