2026 ICD-10-CM Diagnosis Code M14.662Charcot's joint, left knee

ICD-10-CM Codes›M00–M99›M05-M14›M14

ICD-10-CM M14.662
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M14.662 is a billable ICD-10-CM diagnosis code for Charcot's joint, left knee. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 553 through 554. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Neurogenic/neuropathic arthropathy.

Code Identity

ICD-10-CM Code
M14.662
Billable Status
Yes — Valid for Submission
Code Describes
Charcot's joint, left knee
Short Description
Charcot's joint, left knee
Same as the full description in the CMS dataset.
Parent Code
M14.66
Charcot's joint, knee

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM05-M14Inflammatory polyarthropathies
CategoryM14Arthropathies in other diseases classified elsewhere
This CodeM14.662Charcot's joint, left knee

Clinical ClassificationClinical

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

CCSR MUS032
Neurogenic/neuropathic arthropathy
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 M14.662 to ICD-9-CMHistory

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

ICD-9-CM
713.5 Arthropathy w nerve dis
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 M14.662Overview

Is M14.662 (Charcot's joint, knee) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report Charcot's joint, left knee on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does M14.662 group to?

When Charcot's joint, left knee is the principal diagnosis on an inpatient stay, it groups to MS-DRG 553, 554, with relative weights from 0.8301 to 1.2963 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of M14.662?

Under the General Equivalence Mappings, Charcot's joint, left knee converts to ICD-9-CM 713.5 (arthropathy w nerve dis). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.