2026 ICD-10-CM Diagnosis Code S93.491DSprain of other ligament of right ankle, subsequent encounter

ICD-10-CM Codes›S00–T88›S90-S99›S93

ICD-10-CM S93.491D
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S93.491D is a billable ICD-10-CM diagnosis code for sprain of other ligament of right ankle, subsequent encounter. The 7th character D marks it as a subsequent encounter code, used during routine care in the healing or recovery phase. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 949 through 950. The code is exempt from POA reporting. Coders also document this condition as disorder of ligament of right ankle joint. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Sprains and strains, subsequent encounter.

This medical diagnosis code is frequently used in Orthopedics medical specialties to designate conditions such selected sprains rotator cuff, cruciate ligament, and ankle.

Code Identity

ICD-10-CM Code
S93.491D
Billable Status
Yes — Valid for Submission
Code Describes
Sprain of other ligament of right ankle, subsequent encounter
Short Description
Sprain of other ligament of right ankle, subs encntr
Parent Code
S93.491
Sprain of other ligament of right ankle

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 CodeS93.491DSprain of other ligament of right ankle, subsequent encounter

Present on Admission (POA)Billing

S93.491D is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Disorder of ligament of right ankle joint
  • Sprain of lateral ligament of ankle joint
  • Sprain of right ankle
  • Sprain of talofibular ligament of right ankle

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 INJ061
Sprains and strains, subsequent encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Ankle Injuries and Disorders

Your ankle bone and the ends of your two lower leg bones make up the ankle joint. Your ligaments, which connect bones to one another, stabilize and support it. Your muscles and tendons move it.

Read the full article at MedlinePlus

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

Convert S93.491D to ICD-9-CMHistory

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

ICD-9-CM
V58.89 Other specfied aftercare
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 S93.491DOverview

Is S93.491D (Sprain of other ligament of right ankle) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report sprain of other ligament of right ankle, subsequent encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character D in S93.491D mean?

The final character D marks a subsequent encounter: use it for routine care while the sprain of other ligament of right ankle is healing, after active treatment has ended.

What MS-DRG does S93.491D group to?

When sprain of other ligament of right ankle, subsequent encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 949, 950, with relative weights from 0.6277 to 1.1897 depending on complications. Higher weights mean higher Medicare reimbursement.

Is S93.491D 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 sprain of other ligament of right ankle, subsequent encounter on inpatient claims.

What is the ICD-9 equivalent of S93.491D?

Under the General Equivalence Mappings, sprain of other ligament of right ankle, subsequent encounter converts to ICD-9-CM V58.89 (other specfied aftercare). 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.