2026 ICD-10-CM Diagnosis Code M13.842Other specified arthritis, left hand

ICD-10-CM Codes›M00–M99›M05-M14›M13

ICD-10-CM M13.842
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M13.842 is a billable ICD-10-CM diagnosis code for other specified arthritis, left hand. 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 Other specified joint disorders.

Code Identity

ICD-10-CM Code
M13.842
Billable Status
Yes — Valid for Submission
Code Describes
Other specified arthritis, left hand
Short Description
Other specified arthritis, left hand
Same as the full description in the CMS dataset.
Parent Code
M13.84
Other specified arthritis, hand

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM05-M14Inflammatory polyarthropathies
CategoryM13Other arthritis
This CodeM13.842Other specified arthritis, left hand

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Arthritis of bilateral first carpometacarpal joints
  • Arthritis of finger of left hand
  • Arthritis of finger of right hand
  • Arthritis of first carpometacarpal joint of left hand
  • Arthritis of first carpometacarpal joint of right hand
  • Arthritis of joint of finger of bilateral hands
  • Arthritis of joint of left hand
  • Bilateral arthritis of hands
  • Bilateral inflammation of hands
  • Inflammation of joint of left hand
  • Inflammation of thumb joint

Clinical ClassificationClinical

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

CCSR MUS007
Other specified joint disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Arthritis

If you feel pain and stiffness in your body or have trouble moving around, you might have arthritis. Any disorder that affects the joints is often called arthritis. Joints are places where two bones meet, such as your elbow or knee.

The full article covers:

  • What is arthritis?
  • What are the types of arthritis?
  • What are the symptoms of arthritis?
  • Who is more likely to get arthritis?
  • How is arthritis diagnosed?
  • What are the treatments for arthritis?

Read the full article at MedlinePlus

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

Convert M13.842 to ICD-9-CMHistory

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

ICD-9-CM
716.24 Allerg arthritis-hand
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 M13.842Overview

Is M13.842 (Other specified arthritis, hand) a billable code?

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

What MS-DRG does M13.842 group to?

When other specified arthritis, left hand 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 M13.842?

Under the General Equivalence Mappings, other specified arthritis, left hand converts to ICD-9-CM 716.24 (allerg arthritis-hand). 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.