2026 ICD-10-CM Diagnosis Code S83.193AOther subluxation of unspecified knee, initial encounter

ICD-10-CM Codes›S00–T88›S80-S89›S83

ICD-10-CM S83.193A
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S83.193A is a billable ICD-10-CM diagnosis code for other subluxation of unspecified knee, 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
S83.193A
Billable Status
Yes — Valid for Submission
Code Describes
Other subluxation of unspecified knee, initial encounter
Short Description
Other subluxation of unspecified knee, initial encounter
Same as the full description in the CMS dataset.
Parent Code
S83.193
Other subluxation of unspecified knee

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS80-S89Injuries to the knee and lower leg
CategoryS83Dislocation and sprain of joints and ligaments of knee
This CodeS83.193AOther subluxation of unspecified knee, initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Closed traumatic dislocation knee joint, lateral
  • Closed traumatic dislocation knee joint, medial
  • Closed traumatic dislocation knee joint, posterior
  • Closed traumatic dislocation patellofemoral joint, lateral
  • Closed traumatic dislocation patellofemoral joint, medial
  • Closed traumatic dislocation, head of fibula
  • Closed traumatic subluxation knee joint
  • Closed traumatic subluxation knee joint, anterior
  • Closed traumatic subluxation knee joint, lateral
  • Closed traumatic subluxation knee joint, medial
  • Closed traumatic subluxation knee joint, posterior
  • Closed traumatic subluxation knee joint, rotatory
  • Closed traumatic subluxation patellofemoral joint
  • Closed traumatic subluxation patellofemoral joint, lateral
  • Closed traumatic subluxation patellofemoral joint, medial
  • Closed traumatic subluxation, head of fibula
  • Lateral patellofemoral dislocation
  • Open traumatic dislocation knee joint, anterior
  • Open traumatic dislocation knee joint, lateral
  • Open traumatic dislocation knee joint, medial
  • Open traumatic dislocation knee joint, posterior
  • Open traumatic dislocation of patellofemoral joint
  • Open traumatic dislocation patellofemoral joint, lateral
  • Open traumatic dislocation patellofemoral joint, medial
  • Open traumatic dislocation, head of fibula
  • Open traumatic subluxation knee joint
  • Open traumatic subluxation knee joint, anterior
  • Open traumatic subluxation knee joint, lateral
  • Open traumatic subluxation knee joint, medial
  • Open traumatic subluxation knee joint, posterior
  • Open traumatic subluxation knee joint, rotatory
  • Open traumatic subluxation patellofemoral joint
  • Open traumatic subluxation patellofemoral joint, lateral
  • Open traumatic subluxation patellofemoral joint, medial
  • Open traumatic subluxation, head of fibula
  • Subluxation of patellofemoral joint

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Dislocation and sprain of joints and ligaments of knee (S83). 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 S83.193A to ICD-9-CMHistory

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

ICD-9-CM
836.59 Dislocat knee NEC-closed
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 S83.193AOverview

Is S83.193A (Other subluxation of unspecified knee) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other subluxation of unspecified knee, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character A in S83.193A mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for other subluxation of unspecified knee, such as an emergency visit or first evaluation.

What MS-DRG does S83.193A group to?

When other subluxation of unspecified knee, 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 S83.193A?

Under the General Equivalence Mappings, other subluxation of unspecified knee, initial encounter converts to ICD-9-CM 836.59 (dislocat knee NEC-closed). 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.