2027 ICD-10-CM Diagnosis Code S93.402DSprain of unspecified ligament of left ankle, subsequent encounter

ICD-10-CM Codes›S00–T88›S90-S99›S93

ICD-10-CM S93.402D
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

S93.402D is a billable ICD-10-CM diagnosis code for sprain of unspecified ligament of left 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 2027 (October 1, 2026 through September 30, 2027) 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 left 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
S93.402D
Billable Status
Yes — Valid for Submission
Code Describes
Sprain of unspecified ligament of left ankle, subsequent encounter
Short Description
Sprain of unspecified ligament of left ankle, subs encntr
Parent Code
S93.402
Sprain of unspecified ligament of left 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 CodeS93.402DSprain of unspecified ligament of left ankle, subsequent encounter

Present on Admission (POA)Billing

S93.402D 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.

  • Disorder of ligament of left ankle joint
  • Sprain of left 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 2027, published by CMS and the National Center for Health Statistics.

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to S93.402D: its own notes plus those printed at S93.4, S93, block S90-S99, and Chapter 19. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From S93 Dislocation and sprain of joints and ligaments at ankle, foot and toe level applies to 336 codes
  • avulsion of joint or ligament of ankle, foot and toe
  • laceration of cartilage, joint or ligament of ankle, foot and toe
  • sprain of cartilage, joint or ligament of ankle, foot and toe
  • traumatic hemarthrosis of joint or ligament of ankle, foot and toe
  • traumatic rupture of joint or ligament of ankle, foot and toe
  • traumatic subluxation of joint or ligament of ankle, foot and toe
  • traumatic tear of joint or ligament of ankle, foot and toe

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From S93.4 Sprain of ankle applies to 45 codes
  • injury of Achilles tendon (S86.0-)
From S93 Dislocation and sprain of joints and ligaments at ankle, foot and toe level applies to 336 codes
  • strain of muscle and tendon of ankle and foot (S96.-)
From Block S90-S99 Injuries to the ankle and foot applies to 3,324 codes
  • burns and corrosions (T20-T32)
  • fracture of ankle and malleolus (S82.-)
  • frostbite (T33-T34)
  • insect bite or sting, venomous (T63.4)
From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • code to identify any retained foreign body, if applicable (Z18.-)

Code Also

A second code may be needed to fully describe the condition; the note gives no sequencing direction.

From S93 Dislocation and sprain of joints and ligaments at ankle, foot and toe level applies to 336 codes
  • any associated open wound

Notes

General instructions on how these codes are used.

From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
  • The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.

7th Character

Every code in the category takes a 7th character from the listed values, with the placeholder X filling any empty positions before it.

From S93 Dislocation and sprain of joints and ligaments at ankle, foot and toe level applies to 336 codes
  • The appropriate 7th character is to be added to each code from category S93
Values for category S93 Encounter: Initial, Subsequent, Sequela
  • Ainitial encounter
  • Dsubsequent encounter this code
  • Ssequela

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name S93.402D, its category, or a range that includes it.

Excludes2 1

These codes carry an Excludes2 note naming S93.402D: its condition is not part of those codes, and both may be reported when the patient has both.

  • S96 Injury of muscle and tendon at ankle and foot level
    sprain of joints and ligaments of ankle and foot (S93.-) names S93.-, which includes this code

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 S93.402D 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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About S93.402DOverview

What is the ICD-10 code for sprain of unspecified ligament of left ankle, subsequent encounter?

The ICD-10-CM code for sprain of unspecified ligament of left ankle, subsequent encounter is S93.402D (sometimes written as S93402D). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is S93.402D (Sprain of unspecified ligament of left ankle) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report sprain of unspecified ligament of left ankle, subsequent encounter on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What does the 7th character D in S93.402D mean?

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

What MS-DRG does S93.402D group to?

When sprain of unspecified ligament of left ankle, subsequent encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 950, 949, with relative weights from 0.7661 to 1.1231 depending on complications. Higher weights mean higher Medicare reimbursement.

Is S93.402D 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 unspecified ligament of left ankle, subsequent encounter on inpatient claims. The code appears in the Injuries to the ankle and foot (S90-S99) range of the CMS exempt list.