2026 ICD-10-CM Diagnosis Code M67.864Other specified disorders of tendon, left knee

ICD-10-CM Codes›M00–M99›M65-M67›M67

ICD-10-CM M67.864
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M67.864 is a billable ICD-10-CM diagnosis code for other specified disorders of tendon, left knee. 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 bilateral tendinitis of knees. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Tendon and synovial disorders.

Code Identity

ICD-10-CM Code
M67.864
Billable Status
Yes — Valid for Submission
Code Describes
Other specified disorders of tendon, left knee
Short Description
Other specified disorders of tendon, left knee
Same as the full description in the CMS dataset.
Parent Code
M67.86
Other specified disorders of synovium and tendon, knee

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM65-M67Disorders of synovium and tendon
CategoryM67Other disorders of synovium and tendon
This CodeM67.864Other specified disorders of tendon, left knee

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Bilateral tendinitis of knees
  • Bilateral tendinosis of knees
  • Tendinitis of left knee
  • Tendinitis of right knee
  • Tendinosis of knee region
  • Tendinosis of left knee
  • Tendinosis of right knee

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

Knee Injuries and Disorders

Your knee joint is made up of bone, cartilage, ligaments and fluid. Muscles and tendons help the knee joint move. When any of these structures is hurt or diseased, you have knee problems. Knee problems can cause pain and difficulty walking.

Read the full article at MedlinePlus

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

Convert M67.864 to ICD-9-CMHistory

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

ICD-9-CM
727.89 Synov/tend/bursa dis 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 M67.864Overview

Is M67.864 (Other specified disorders of synovium and tendon, knee) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other specified disorders of tendon, left knee on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does M67.864 group to?

When other specified disorders of tendon, left knee 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 M67.864?

Under the General Equivalence Mappings, other specified disorders of tendon, left knee converts to ICD-9-CM 727.89 (synov/tend/bursa dis 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.