2026 ICD-10-CM Diagnosis Code M12.849Other specific arthropathies, not elsewhere classified, unspecified hand

ICD-10-CM Codes›M00–M99›M05-M14›M12

ICD-10-CM M12.849
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M12.849 is a billable ICD-10-CM diagnosis code for other specific arthropathies, not elsewhere classified, unspecified 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. Coders also document this condition as carpometacarpal bossing. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified joint disorders.

Code Identity

ICD-10-CM Code
M12.849
Billable Status
Yes — Valid for Submission
Code Describes
Other specific arthropathies, not elsewhere classified, unspecified hand
Short Description
Oth specific arthropathies, NEC, unsp hand
Parent Code
M12.84
Other specific arthropathies, not elsewhere classified, hand

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM05-M14Inflammatory polyarthropathies
CategoryM12Other and unspecified arthropathy
This CodeM12.849Other specific arthropathies, not elsewhere classified, unspecified hand

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Carpometacarpal bossing
  • Familial digital arthropathy and brachydactyly syndrome
  • Inflammation of finger joint
  • Transient arthropathy of distal interphalangeal joint of finger
  • Transient arthropathy of hand
  • Transient arthropathy of metacarpophalangeal joint
  • Transient arthropathy of proximal interphalangeal joint of finger

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

Hand Injuries and Disorders

No matter how old you are or what you do for a living, you are always using your hands. When there is something wrong with them, you may not be able to do your regular activities.

Read the full article at MedlinePlus

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

Convert M12.849 to ICD-9-CMHistory

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

ICD-9-CM
716.44 Trans arthropathy-hand
Approximate The match is approximate rather than exact.
ICD-9-CM
716.84 Arthropathy NEC-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 M12.849Overview

Is M12.849 (Other specific arthropathies, not elsewhere classified, hand) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other specific arthropathies, not elsewhere classified, unspecified hand on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does M12.849 group to?

When other specific arthropathies, not elsewhere classified, unspecified 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 M12.849?

Under the General Equivalence Mappings, other specific arthropathies, not elsewhere classified, unspecified hand converts to ICD-9-CM 716.44 (trans arthropathy-hand) and 716.84 (arthropathy NEC-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.