2026 ICD-10-CM Diagnosis Code M67.99Unspecified disorder of synovium and tendon, multiple sites

ICD-10-CM Codes›M00–M99›M65-M67›M67

ICD-10-CM M67.99
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M67.99 is a billable ICD-10-CM diagnosis code for unspecified disorder of synovium and tendon, multiple sites. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Tendon and synovial disorders.

Code Identity

ICD-10-CM Code
M67.99
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified disorder of synovium and tendon, multiple sites
Short Description
Unspecified disorder of synovium and tendon, multiple sites
Same as the full description in the CMS dataset.
Parent Code
M67.9
Unspecified disorder of synovium and tendon

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM65-M67Disorders of synovium and tendon
CategoryM67Other disorders of synovium and tendon
This CodeM67.99Unspecified disorder of synovium and tendon, multiple sites

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Disorder(of)
      • synovium
        • multiple sites
    • Disorder(of)
      • tendon
        • multiple sites

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

Joint Disorders

Your joints are places where two or more bones come together. Your shoulders, elbows, hips, knees, and knuckles are all joints. Your spine has joints, too.

The full article covers:

  • What are joints?
  • What are joint disorders?
  • What diseases can affect the joints?
  • What types of joint disorders happen from sudden injuries?
  • What types of joint disorders happen from overuse?
  • How can I keep my joints healthy?

Read the full article at MedlinePlus

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

Convert M67.99 to ICD-9-CMHistory

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

ICD-9-CM
727.9 Synov/tend/bursa dis NOS
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 M67.99Overview

Is M67.99 (Unspecified disorder of synovium and tendon) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report unspecified disorder of synovium and tendon, multiple sites on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does M67.99 group to?

When unspecified disorder of synovium and tendon, multiple sites 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 M67.99?

Under the General Equivalence Mappings, unspecified disorder of synovium and tendon, multiple sites converts to ICD-9-CM 727.9 (synov/tend/bursa dis NOS). 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.