2026 ICD-10-CM Diagnosis Code S93.121ADislocation of metatarsophalangeal joint of right great toe, initial encounter

ICD-10-CM Codes›S00–T88›S90-S99›S93

ICD-10-CM S93.121A
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S93.121A is a billable ICD-10-CM diagnosis code for dislocation of metatarsophalangeal joint of right great toe, 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Dislocations, initial encounter.

Code Identity

ICD-10-CM Code
S93.121A
Billable Status
Yes — Valid for Submission
Code Describes
Dislocation of metatarsophalangeal joint of right great toe, initial encounter
Short Description
Dislocation of MTP joint of right great toe, init
Parent Code
S93.121
Dislocation of metatarsophalangeal joint of right great toe

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 CodeS93.121ADislocation of metatarsophalangeal joint of right great toe, initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Closed traumatic dislocation of joint of right foot
  • Closed traumatic dislocation of joint of right toe
  • Closed traumatic dislocation of metatarsophalangeal joint
  • Closed traumatic dislocation of metatarsophalangeal joint of right great toe
  • Open traumatic dislocation of joint of right foot
  • Open traumatic dislocation of joint of right toe
  • Open traumatic dislocation of metatarsophalangeal joint of right great toe
  • Traumatic arthropathy of 1st metatarsophalangeal joint
  • Traumatic dislocation of great toe
  • Traumatic dislocation of metatarsophalangeal joint of great toe

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 INJ007
Dislocations, initial encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Dislocations

Dislocations are joint injuries that force the ends of your bones out of position. The cause is often a fall or a blow, sometimes from playing a contact sport. You can dislocate your ankles, knees, shoulders, hips, elbows and jaw. You can also dislocate your finger and toe joints.

Read the full article at MedlinePlus

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

Convert S93.121A to ICD-9-CMHistory

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

ICD-9-CM
838.05 Disl metatarsophalang-cl
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 S93.121AOverview

Is S93.121A (Dislocation of metatarsophalangeal joint of right great toe) a billable code?

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

What does the 7th character A in S93.121A mean?

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

What MS-DRG does S93.121A group to?

When dislocation of metatarsophalangeal joint of right great toe, 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 S93.121A?

Under the General Equivalence Mappings, dislocation of metatarsophalangeal joint of right great toe, initial encounter converts to ICD-9-CM 838.05 (disl metatarsophalang-cl). 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.