2026 ICD-10-CM Diagnosis Code S93.524ASprain of metatarsophalangeal joint of right lesser toe(s), initial encounter

ICD-10-CM Codes›S00–T88›S90-S99›S93

ICD-10-CM S93.524A
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S93.524A is a billable ICD-10-CM diagnosis code for sprain of metatarsophalangeal joint of right 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 562 through 563, 963 through 965. Coders also document this condition as disorder of ligament of right foot. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Sprains and strains, initial encounter.

Code Identity

ICD-10-CM Code
S93.524A
Billable Status
Yes — Valid for Submission
Code Describes
Sprain of metatarsophalangeal joint of right lesser toe(s), initial encounter
Short Description
Sprain of MTP joint of right lesser toe(s), init
Parent Code
S93.524
Sprain of metatarsophalangeal joint of right lesser toe(s)

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS90-S99Injuries to the ankle and foot
CategoryS93Dislocation and sprain of joints and ligaments at ankle, foot and toe level
This CodeS93.524ASprain of metatarsophalangeal joint of right lesser toe(s), initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Disorder of ligament of right foot
  • Sprain of ligament of joint of lesser toe
  • Sprain of ligament of joint of lesser toe of right foot
  • Sprain of ligament of metatarsophalangeal joint of lesser toe
  • Sprain of metatarsophalangeal joint of right lesser toe
  • Sprain of right foot
  • Sprain, metatarsophalangeal joint
  • Traumatic arthropathy of lesser metatarsophalangeal joint

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Dislocation and sprain of joints and ligaments at ankle, foot and toe level (S93). 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 INJ024
Sprains and strains, initial encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Sprains and Strains

A sprain is a stretched or torn ligament. Ligaments are tissues that connect bones at a joint. Falling, twisting, or getting hit can all cause a sprain. Ankle and wrist sprains are common. Symptoms include pain, swelling, bruising, and being unable to move your joint. You might feel a pop or tear when the injury happens.

Read the full article at MedlinePlus

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

Convert S93.524A to ICD-9-CMHistory

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

ICD-9-CM
845.12 Sprain metatarsophalang
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 S93.524AOverview

Is S93.524A (Sprain of metatarsophalangeal joint of right lesser toe(s)) a billable code?

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

What does the 7th character A in S93.524A mean?

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

What MS-DRG does S93.524A group to?

When sprain of metatarsophalangeal joint of right lesser toe(s), initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 562, 563, 963, 964, 965, with relative weights from 0.8955 to 2.7338 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of S93.524A?

Under the General Equivalence Mappings, sprain of metatarsophalangeal joint of right lesser toe(s), initial encounter converts to ICD-9-CM 845.12 (sprain metatarsophalang). 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.