2026 ICD-10-CM Diagnosis Code M67.331Transient synovitis, right wrist

ICD-10-CM Codes›M00–M99›M65-M67›M67

ICD-10-CM M67.331
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M67.331 is a billable ICD-10-CM diagnosis code for transient synovitis, right wrist. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 557 through 558. Coders also document this condition as arthritis of bilateral radiocarpal joints. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Tendon and synovial disorders.

Code Identity

ICD-10-CM Code
M67.331
Billable Status
Yes — Valid for Submission
Code Describes
Transient synovitis, right wrist
Short Description
Transient synovitis, right wrist
Same as the full description in the CMS dataset.
Parent Code
M67.33
Transient synovitis, wrist

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM65-M67Disorders of synovium and tendon
CategoryM67Other disorders of synovium and tendon
This CodeM67.331Transient synovitis, right wrist

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Arthritis of bilateral radiocarpal joints
  • Synovitis of joint of left wrist
  • Synovitis of joint of right wrist
  • Transient arthropathy of wrist
  • Transient synovitis of bilateral wrists
  • Transient synovitis of left wrist
  • Transient synovitis of right wrist

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR MUS009
Tendon and synovial disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Wrist Injuries and Disorders

Your wrist connects your hand to your forearm. It is not one big joint; it has several small joints. This makes it flexible and allows you to move your hand in different ways. The wrist has two big forearm bones and eight small bones known as carpals. It also has tendons and ligaments, which are connective tissues.

The full article covers:

  • What are the types of wrist injuries and disorders?
  • Who is at risk for wrist injuries and disorders?
  • What are the symptoms of wrist injuries and disorders?
  • How are wrist injuries and disorders diagnosed?
  • What are the treatments for wrist injuries and disorders?
  • Can wrist injuries and disorders be prevented?

Read the full article at MedlinePlus

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

Convert M67.331 to ICD-9-CMHistory

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

ICD-9-CM
727.09 Synovitis NEC
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 M67.331Overview

Is M67.331 (Transient synovitis, wrist) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report transient synovitis, right wrist on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does M67.331 group to?

When transient synovitis, right wrist is the principal diagnosis on an inpatient stay, it groups to MS-DRG 557, 558, with relative weights from 0.8932 to 1.4869 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of M67.331?

Under the General Equivalence Mappings, transient synovitis, right wrist converts to ICD-9-CM 727.09 (synovitis NEC). 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.